7Baggers

Nasdaq, Inc
(NASDAQ:NDAQ) 

NDAQ stock logo

Nasdaq, Inc. operates as a technology company that serves capital markets and other industries worldwide. It operates through four segments: Market Services, Corporate Platforms, Investment Intelligence, and Market Technology. The Market Services segment includes equity derivative trading and cleari...

Founded: 1971
Full Time Employees: 4,776
Sector: Financial Services
Industry: Financial Data & Stock Exchanges

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At a glance:
Bull Thesis:
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Quarterly
Annual
    Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                             
      revenues:
                                                                                             
      capital access platforms
    549,000,000 546,000,000 527,000,000 515,000,000 512,000,000 501,000,000 481,000,000 479,000,000 461,000,000 456,000,000 438,000,000 416,000,000                                                                              
      financial technology
    498,000,000 457,000,000 464,000,000 432,000,000 438,000,000 371,000,000 420,000,000 392,000,000                                                                                  
      market services
    1,043,000,000 946,000,000 1,090,000,000 1,134,000,000 1,071,000,000 1,022,000,000 883,000,000 794,000,000     723,000,000 972,000,000 969,000,000 958,000,000 884,000,000 814,000,000 878,000,000 1,139,000,000 965,000,000 958,000,000 975,000,000 933,000,000 644,000,000 690,000,000 665,000,000 638,000,000 741,000,000 586,000,000 649,000,000 735,000,000 610,000,000 581,000,000 620,000,000 606,000,000 594,000,000 557,000,000 532,000,000 572,000,000 523,000,000 542,000,000 478,000,000 539,000,000 607,000,000 515,000,000 544,000,000 582,000,000 533,000,000 499,000,000 553,000,000 508,000,000 603,000,000 603,000,000 688,000,000 666,000,000 696,000,000 808,000,000 699,000,000 683,000,000 671,000,000 628,000,000 756,000,000 645,000,000 686,000,000 691,000,000 768,000,000 784,000,000 906,986,000 879,260,000 694,085,000 726,963,000 590,840,000 578,668,000 487,390,000 495,494,000 380,372,000 343,037,000 347,587,000 337,094,000 200,264,000 164,648,000 163,626,000 125,085,000 116,156,000 73,304,000 68,931,000   
      other revenues
    34,000,000 9,000,000 9,000,000 9,000,000 9,000,000 8,000,000 8,000,000 9,000,000 9,000,000 10,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 2,000,000             6,000,000                                                           
      total revenues
    2,124,000,000 1,958,000,000 2,090,000,000 2,090,000,000 2,030,000,000 1,902,000,000 1,792,000,000 1,674,000,000 1,647,000,000 1,451,000,000 1,433,000,000 1,533,000,000 1,582,000,000 1,557,000,000 1,552,000,000 1,535,000,000 1,467,000,000 1,357,000,000 1,412,000,000 1,652,000,000 1,462,000,000 1,414,000,000 1,398,000,000 1,353,000,000 1,065,000,000 1,096,000,000 1,061,000,000 1,039,000,000 1,136,000,000 964,000,000 1,027,000,000 1,151,000,000 1,024,000,000 969,000,000 1,000,000,000 971,000,000 973,000,000 929,000,000 897,000,000 905,000,000 865,000,000 871,000,000 807,000,000 858,000,000 920,000,000 818,000,000 865,000,000 898,000,000 849,000,000 805,000,000 814,000,000 744,000,000 752,000,000 743,000,000 823,000,000 801,000,000 837,000,000 946,000,000 838,000,000 817,000,000 806,000,000 751,000,000 876,000,000 764,000,000 816,000,000 810,000,000 889,000,000 895,000,000 1,023,009,000 990,380,000 821,478,000 813,826,000 664,486,000 651,961,000 558,201,000 561,947,000 447,440,000 402,859,000 411,032,000 396,239,000 259,575,000 220,465,000 219,686,000 180,193,000 168,054,000 123,970,000 120,013,000 128,404,000  
      yoy
    4.63% 2.94% 16.63% 24.85% 23.25% 31.08% 25.05% 9.20% 4.11% -6.81% -7.67% -0.13% 7.84% 14.74% 9.92% -7.08% 0.34% -4.03% 1.00% 22.10% 37.28% 29.01% 31.76% 30.22% -6.25% 13.69% 3.31% -9.73% 10.94% -0.52% 2.70% 18.54% 5.24% 4.31% 11.48% 7.29% 12.49% 6.66% 11.15% 5.48% -5.98% 6.48% -6.71% -4.45% 8.36% 1.61% 6.27% 20.70% 12.90% 8.34% -1.09% -7.12% -10.16% -21.46% -1.79% -1.96% 3.85% 25.97% -4.34% 6.94% -1.23% -7.28% -1.46% -14.64% -20.24% -18.21% 8.22% 9.97% 53.95% 51.91% 47.17% 44.82% 48.51% 61.83% 35.80% 41.82% 72.37% 82.73% 87.10% 119.90% 54.46% 77.84% 83.05% 40.33%      
      qoq
    8.48% -6.32% 0.00% 2.96% 6.73% 6.14% 7.05% 1.64% 13.51% 1.26% -6.52% -3.10% 1.61% 0.32% 1.11% 4.64% 8.11% -3.90% -14.53% 13.00% 3.39% 1.14% 3.33% 27.04% -2.83% 3.30% 2.12% -8.54% 17.84% -6.13% -10.77% 12.40% 5.68% -3.10% 2.99% -0.21% 4.74% 3.57% -0.88% 4.62% -0.69% 7.93% -5.94% -6.74% 12.47% -5.43% -3.67% 5.77% 5.47% -1.11% 9.41% -1.06% 1.21% -9.72% 2.75% -4.30% -11.52% 12.89% 2.57% 1.36% 7.32% -14.27% 14.66% -6.37% 0.74% -8.89% -0.67% -12.51% 3.29% 20.56% 0.94% 22.47% 1.92% 16.80% -0.67% 25.59% 11.07% -1.99% 3.73% 52.65% 17.74% 0.35% 21.92% 7.22% 35.56% 3.30% -6.53%   
      transaction-based expenses:
                                                                                             
      transaction rebates
    -727,000,000 -637,000,000 -629,000,000 -579,000,000 -548,000,000 -513,000,000 -483,000,000 -481,000,000 -461,000,000 -447,000,000 -444,000,000 -487,000,000 -487,000,000 -494,000,000 -529,000,000 -581,000,000 -526,000,000 -472,000,000 -517,000,000 -654,000,000 -503,000,000 -518,000,000 -530,000,000 -479,000,000 -315,000,000 -349,000,000 -331,000,000 -331,000,000 -397,000,000 -293,000,000 -308,000,000 -348,000,000 -284,000,000 -266,000,000 -304,000,000 -301,000,000 -288,000,000 -265,000,000 -256,000,000 -283,000,000 -250,000,000 -256,000,000 -216,000,000 -261,000,000 -294,000,000 -236,000,000 -252,000,000 -285,000,000 -253,000,000 -231,000,000 -276,000,000 -242,000,000 -249,000,000 -250,000,000 -299,000,000 -306,000,000 -323,000,000 -390,000,000 -322,000,000 -309,000,000                              
      brokerage, clearance and exchange fees
    -5,000,000 -6,000,000 -155,000,000 -274,000,000 -255,000,000 -243,000,000 -150,000,000 -76,000,000 -69,000,000 -64,000,000 -64,000,000 -132,000,000 -188,000,000 -173,000,000 -130,000,000 -62,000,000 -55,000,000 -47,000,000 -49,000,000 -147,000,000 -171,000,000 -181,000,000 -169,000,000 -173,000,000 -104,000,000 -115,000,000 -107,000,000 -74,000,000 -95,000,000 -71,000,000 -104,000,000 -137,000,000 -104,000,000 -96,000,000 -94,000,000 -87,000,000 -86,000,000 -79,000,000 -82,000,000 -88,000,000 -79,000,000 -86,000,000 -73,000,000 -90,000,000 -108,000,000 -85,000,000 -90,000,000 -84,000,000 -76,000,000 -68,000,000 -87,000,000 -84,000,000 -84,000,000 -84,000,000 -100,000,000 -84,000,000 -93,000,000 -118,000,000 -100,000,000 -93,000,000 -83,000,000 -82,000,000 -112,000,000 -84,000,000 -139,000,000 -132,000,000 -141,000,000 -71,000,000 -92,064,000 -106,976,000 -94,558,000 -150,723,000 -157,867,000 -150,777,000 -121,208,000 -144,690,000 -110,557,000 -78,513,000 -69,248,000 -67,023,000 34,819,000 25,003,000 20,045,000       
      revenues less transaction-based expenses
    1,392,000,000 1,315,000,000 1,306,000,000 1,237,000,000 1,227,000,000 1,146,000,000 1,159,000,000 1,117,000,000 1,117,000,000 940,000,000 925,000,000 914,000,000 907,000,000 890,000,000 893,000,000 892,000,000 886,000,000 838,000,000 846,000,000 851,000,000 788,000,000 715,000,000 699,000,000 701,000,000 646,000,000 632,000,000 623,000,000 634,000,000 644,000,000 600,000,000 615,000,000 666,000,000 636,000,000 607,000,000 602,000,000 583,000,000 599,000,000 585,000,000 559,000,000 534,000,000 536,000,000 529,000,000 518,000,000 507,000,000                                              
      operating expenses:
                                                                                             
      compensation and benefits
    359,000,000 353,000,000 352,000,000 329,000,000 324,000,000 332,000,000 328,000,000 340,000,000 305,000,000 260,000,000 261,000,000 256,000,000 253,000,000 249,000,000 247,000,000 254,000,000 238,000,000 230,000,000 231,000,000 239,000,000 204,000,000 198,000,000 189,000,000 195,000,000 189,000,000 175,000,000 169,000,000 175,000,000 178,000,000 164,000,000 173,000,000 197,000,000 182,000,000 169,000,000 163,000,000 161,000,000 180,000,000 168,000,000 164,000,000 152,000,000 149,000,000 150,000,000 144,000,000 147,000,000 149,000,000 136,000,000 145,000,000 158,000,000 145,000,000 150,000,000 126,000,000 117,000,000 116,000,000 113,000,000 113,000,000 112,000,000 113,000,000 118,000,000 115,000,000 112,000,000 111,000,000 102,000,000 104,000,000 99,000,000 110,000,000 99,000,000 105,000,000 97,000,000 106,384,000 105,998,000 115,176,000 73,402,000 54,421,000 51,971,000 49,704,000 44,272,000 51,216,000 47,560,000 48,018,000 48,868,000 41,709,000 36,190,000 36,902,000 37,311,000 35,731,000 38,094,000 36,921,000 37,409,000  
      professional and contract services
    48,000,000 38,000,000 39,000,000 36,000,000 44,000,000 36,000,000 39,000,000 34,000,000 36,000,000 31,000,000 30,000,000 32,000,000 43,000,000 34,000,000 29,000,000 35,000,000 43,000,000 36,000,000 38,000,000 27,000,000 41,000,000 38,000,000 31,000,000 27,000,000 28,000,000 31,000,000 30,000,000 37,000,000 39,000,000 33,000,000 34,000,000 37,000,000 44,000,000 39,000,000 38,000,000 36,000,000 42,000,000 40,000,000 35,000,000 35,000,000 40,000,000 33,000,000 42,000,000 33,000,000 39,000,000 37,000,000 42,000,000 39,000,000 47,000,000 41,000,000 35,000,000 29,000,000 27,000,000 24,000,000 23,000,000 22,000,000 24,000,000 23,000,000 22,000,000 21,000,000 21,000,000 18,000,000 20,000,000 19,000,000 20,000,000 20,000,000 17,000,000 18,000,000 18,729,000 16,822,000 22,543,000 13,801,000 8,647,000 6,433,000 8,652,000 8,382,000 9,045,000 6,764,000 7,299,000 8,903,000 7,696,000 7,428,000 6,972,000 7,052,000 7,120,000 6,676,000 4,684,000 5,229,000  
      technology and communication infrastructure
    80,000,000 80,000,000 79,000,000 77,000,000 74,000,000 71,000,000 69,000,000                                                                                   
      occupancy
    34,000,000 32,000,000 30,000,000 28,000,000 27,000,000 28,000,000 27,000,000 28,000,000 30,000,000 28,000,000 32,000,000 39,000,000 26,000,000 25,000,000 25,000,000 27,000,000 28,000,000 27,000,000 26,000,000 28,000,000 27,000,000 29,000,000 26,000,000 25,000,000 25,000,000 24,000,000 24,000,000 24,000,000 23,000,000 23,000,000 23,000,000 25,000,000 26,000,000 23,000,000 23,000,000 23,000,000 24,000,000 23,000,000 19,000,000 20,000,000 22,000,000 22,000,000 21,000,000 21,000,000 35,000,000 26,000,000 24,000,000 25,000,000 27,000,000 26,000,000 23,000,000 22,000,000 26,000,000 22,000,000 23,000,000 23,000,000 23,000,000 23,000,000 23,000,000 23,000,000 22,000,000 23,000,000 21,000,000 22,000,000 26,000,000 19,000,000 18,000,000 17,000,000 17,407,000 18,839,000 16,595,000 12,333,000 8,497,000 8,219,000 8,975,000 8,865,000 8,448,000 9,492,000 8,208,000 7,976,000 7,094,000 7,178,000 7,082,000 7,076,000 7,404,000 7,146,000 6,888,000 7,292,000  
      general, administrative and other
    24,000,000 22,000,000 23,000,000 6,000,000 25,000,000 26,000,000 30,000,000 28,000,000 51,000,000 26,000,000 22,000,000 14,000,000 31,000,000 38,000,000 34,000,000 21,000,000 19,000,000 42,000,000 12,000,000 13,000,000 43,000,000 13,000,000 25,000,000 61,000,000 30,000,000 40,000,000 40,000,000 16,000,000 47,000,000 28,000,000 25,000,000 22,000,000 18,000,000 15,000,000 30,000,000 19,000,000 22,000,000 19,000,000 17,000,000 14,000,000 -12,000,000 11,000,000 19,000,000 46,000,000 14,000,000 18,000,000 33,000,000 23,000,000 19,000,000 17,000,000 19,000,000 25,000,000 14,000,000 15,000,000 15,000,000 14,000,000 40,000,000 18,000,000 14,000,000 15,000,000 12,000,000 11,000,000 12,000,000 54,000,000 11,000,000 21,000,000 11,000,000 13,000,000 11,340,000 25,401,000 15,392,000 9,891,000 8,435,000 31,193,000 4,721,000 16,060,000              
      marketing and advertising
    24,000,000 13,000,000 14,000,000 14,000,000 20,000,000 11,000,000 12,000,000 11,000,000 17,000,000 12,000,000 9,000,000 9,000,000 20,000,000 10,000,000 11,000,000 10,000,000 25,000,000 12,000,000 9,000,000 10,000,000 19,000,000 7,000,000 4,000,000 9,000,000 10,000,000 8,000,000 10,000,000 10,000,000 10,000,000 7,000,000 10,000,000 9,000,000 9,000,000 7,000,000 8,000,000 7,000,000 8,000,000 8,000,000 8,000,000 6,000,000 8,000,000 6,000,000 6,000,000 7,000,000 9,000,000 5,000,000 9,000,000 8,000,000 8,000,000 7,000,000 8,000,000 7,000,000 6,000,000 6,000,000 6,000,000 6,000,000 9,000,000 4,000,000 5,000,000 5,000,000 6,000,000 5,000,000 5,000,000 4,000,000 8,000,000 3,000,000 3,000,000 2,000,000 5,688,000 7,067,000 3,960,000 1,898,000 7,575,000 4,146,000 4,227,000 4,875,000 8,184,000 3,487,000 3,820,000 5,031,000 4,194,000 1,470,000 2,026,000 1,346,000 3,794,000 2,819,000 3,537,000 2,640,000  
      depreciation and amortization
    161,000,000 158,000,000 158,000,000 156,000,000 153,000,000 153,000,000 153,000,000 155,000,000 125,000,000 64,000,000 65,000,000 69,000,000 63,000,000 63,000,000 65,000,000 67,000,000 81,000,000 67,000,000 68,000,000 63,000,000 53,000,000 51,000,000 50,000,000 48,000,000 47,000,000 47,000,000 48,000,000 48,000,000 51,000,000 53,000,000 53,000,000 53,000,000 48,000,000 47,000,000 47,000,000 45,000,000 45,000,000 46,000,000 41,000,000 38,000,000 36,000,000 34,000,000 34,000,000 34,000,000 33,000,000 34,000,000 35,000,000 35,000,000 34,000,000 33,000,000 28,000,000 27,000,000 27,000,000 26,000,000 25,000,000 26,000,000 28,000,000 28,000,000 26,000,000 27,000,000 28,000,000 25,000,000 25,000,000 25,000,000 26,000,000 27,000,000 27,000,000 24,000,000 26,849,000 27,871,000 22,193,000 15,912,000 9,594,000 9,662,000 9,796,000 9,839,000 10,584,000 14,312,000 21,471,000 24,549,000 20,221,000 13,639,000 14,933,000 18,193,000 21,339,000 18,871,000 16,510,000 19,616,000  
      regulatory
    11,000,000 12,000,000 14,000,000 15,000,000 18,000,000 9,000,000 18,000,000 9,000,000 7,000,000 9,000,000 9,000,000 9,000,000 9,000,000 9,000,000 8,000,000 8,000,000 42,000,000 8,000,000 7,000,000 7,000,000 8,000,000 2,000,000 7,000,000 7,000,000 8,000,000 8,000,000 8,000,000 7,000,000 8,000,000 8,000,000 8,000,000 8,000,000 8,000,000 9,000,000 8,000,000 8,000,000 14,000,000 8,000,000 6,000,000 7,000,000 7,000,000 7,000,000 7,000,000 7,000,000 6,000,000 7,000,000 7,000,000 7,000,000 7,000,000 8,000,000 8,000,000 7,000,000 8,000,000 8,000,000 9,000,000 9,000,000 9,000,000 9,000,000 8,000,000 9,000,000 9,000,000 9,000,000 9,000,000 9,000,000 3,000,000 10,000,000 10,000,000 9,000,000 6,893,000 7,091,000 7,487,000 7,472,000 7,361,000 7,668,000 7,112,000 6,724,000              
      merger and strategic initiatives
    7,000,000 9,000,000 20,000,000 24,000,000 12,000,000 10,000,000 4,000,000 9,000,000 97,000,000 4,000,000 45,000,000 2,000,000 41,000,000 14,000,000 12,000,000 15,000,000 17,000,000 13,000,000 12,000,000 45,000,000 21,000,000 1,000,000 4,000,000 7,000,000 5,000,000 10,000,000 5,000,000 9,000,000 14,000,000 6,000,000 -10,000,000 10,000,000 24,000,000 3,000,000 11,000,000 6,000,000 20,000,000 12,000,000 35,000,000 9,000,000 3,000,000 4,000,000 3,000,000  35,000,000 5,000,000 14,000,000 28,000,000 -11,000,000  25,000,000 8,000,000  -3,000,000 1,000,000 2,000,000  3,000,000 29,000,000 5,000,000 2,000,000 1,000,000 1,000,000                           
      restructuring charges
    15,000,000 12,000,000 9,000,000 5,000,000 13,000,000 22,000,000 56,000,000 26,000,000 31,000,000 17,000,000 14,000,000 18,000,000       21,000,000 10,000,000 12,000,000 11,000,000 13,000,000 12,000,000 9,000,000 30,000,000             33,000,000 9,000,000 12,000,000 8,000,000 2,000,000 150,000,000         8,000,000 10,000,000 17,000,000 9,000,000                                  
      total operating expenses
    763,000,000 729,000,000 738,000,000 690,000,000 710,000,000 698,000,000 736,000,000 707,000,000 764,000,000 509,000,000 543,000,000 502,000,000 558,000,000 492,000,000 481,000,000 487,000,000 542,000,000 482,000,000 470,000,000 486,000,000 470,000,000 389,000,000 384,000,000 426,000,000 386,000,000 406,000,000 367,000,000 359,000,000 403,000,000 354,000,000 346,000,000 393,000,000 393,000,000 343,000,000 358,000,000 335,000,000 386,000,000 352,000,000 385,000,000 315,000,000 291,000,000 298,000,000 301,000,000 480,000,000 345,000,000 290,000,000 332,000,000 345,000,000 282,000,000 304,000,000 292,000,000 328,000,000 245,000,000 239,000,000 249,000,000 240,000,000 261,000,000 243,000,000 258,000,000 234,000,000 226,000,000 207,000,000 211,000,000 248,000,000 221,000,000 218,000,000 208,000,000 203,000,000 215,267,000 233,982,000 225,331,000 145,313,000 110,036,000 126,096,000 99,744,000 110,703,000              
      operating income
    629,000,000 586,000,000 568,000,000 547,000,000 517,000,000 448,000,000 423,000,000 410,000,000 353,000,000 431,000,000 382,000,000 412,000,000 349,000,000 398,000,000 412,000,000 405,000,000 344,000,000 356,000,000 376,000,000 365,000,000 318,000,000 326,000,000 315,000,000 275,000,000 260,000,000 226,000,000 256,000,000 275,000,000 241,000,000 246,000,000 269,000,000 273,000,000 243,000,000 264,000,000 244,000,000 248,000,000 213,000,000 233,000,000 174,000,000 219,000,000 245,000,000 231,000,000 217,000,000 27,000,000 173,000,000 207,000,000 191,000,000 184,000,000 238,000,000 202,000,000 159,000,000 90,000,000 174,000,000 170,000,000 175,000,000 171,000,000 160,000,000 195,000,000 158,000,000 181,000,000 175,000,000 165,000,000 179,000,000 112,000,000 148,000,000 131,000,000 159,000,000 166,000,000 187,288,000 165,056,000 154,822,000 133,019,000 101,514,000 83,848,000 98,936,000 81,364,000 68,091,000 67,859,000 36,330,000 41,811,000 33,220,000 31,362,000 26,323,000 22,758,000   8,563,000 8,604,000  
      yoy
    21.66% 30.80% 34.28% 33.41% 46.46% 3.94% 10.73% -0.49% 1.15% 8.29% -7.28% 1.73% 1.45% 11.80% 9.57% 10.96% 8.18% 9.20% 19.37% 32.73% 22.31% 44.25% 23.05% 0.00% 7.88% -8.13% -4.83% 0.73% -0.82% -6.82% 10.25% 10.08% 14.08% 13.30% 40.23% 13.24% -13.06% 0.87% -19.82% 711.11% 41.62% 11.59% 13.61% -85.33% -27.31% 2.48% 20.13% 104.44% 36.78% 18.82% -9.14% -47.37% 8.75% -12.82% 10.76% -5.52% -8.57% 18.18% -11.73% 61.61% 18.24% 25.95% 12.58% -32.53% -20.98% -20.63% 2.70% 24.79% 84.49% 96.85% 56.49% 63.49% 49.09% 23.56% 172.33% 94.60% 104.97% 116.37% 38.02% 83.72%   207.40% 164.50%      
      qoq
    7.34% 3.17% 3.84% 5.80% 15.40% 5.91% 3.17% 16.15% -18.10% 12.83% -7.28% 18.05% -12.31% -3.40% 1.73% 17.73% -3.37% -5.32% 3.01% 14.78% -2.45% 3.49% 14.55% 5.77% 15.04% -11.72% -6.91% 14.11% -2.03% -8.55% -1.47% 12.35% -7.95% 8.20% -1.61% 16.43% -8.58% 33.91% -20.55% -10.61% 6.06% 6.45% 703.70% -84.39% -16.43% 8.38% 3.80% -22.69% 17.82% 27.04% 76.67% -48.28% 2.35% -2.86% 2.34% 6.88% -17.95% 23.42% -12.71% 3.43% 6.06% -7.82% 59.82% -24.32% 12.98% -17.61% -4.22% -11.37% 13.47% 6.61% 16.39% 31.04% 21.07% -15.25% 21.60% 19.49% 0.34% 86.79% -13.11% 25.86% 5.92% 19.14% 15.66%    -0.48%   
      operating margin %
    29.61% 29.93% 27.18% 26.17% 25.47% 23.55% 23.60% 24.49% 21.43% 29.70% 26.66% 26.88% 22.06% 25.56% 26.55% 26.38% 23.45% 26.23% 26.63% 22.09% 21.75% 23.06% 22.53% 20.33% 24.41% 20.62% 24.13% 26.47% 21.21% 25.52% 26.19% 23.72% 23.73% 27.24% 24.40% 25.54% 21.89% 25.08% 19.40% 24.20% 28.32% 26.52% 26.89% 3.15% 18.80% 25.31% 22.08% 20.49% 28.03% 25.09% 19.53% 12.10% 23.14% 22.88% 21.26% 21.35% 19.12% 20.61% 18.85% 22.15% 21.71% 21.97% 20.43% 14.66% 18.14% 16.17% 17.89% 18.55% 18.31% 16.67% 18.85% 16.34% 15.28% 12.86% 17.72% 14.48% 15.22% 16.84% 8.84% 10.55% 12.80% 14.23% 11.98% 12.63% 0% 0% 7.14% 6.70%  
      interest income
    7,000,000 8,000,000 12,000,000 11,000,000 8,000,000 8,000,000 6,000,000 6,000,000 29,000,000 72,000,000 8,000,000 6,000,000 4,000,000 2,000,000      1,000,000   1,000,000 2,000,000 2,000,000 3,000,000 3,000,000 3,000,000 2,000,000 3,000,000 2,000,000 2,000,000 1,000,000 2,000,000 2,000,000 2,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 2,000,000 1,000,000 1,000,000 2,000,000 2,000,000 2,000,000 2,000,000 3,000,000 4,000,000 2,000,000 2,000,000 2,000,000 3,000,000 3,000,000 3,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 3,000,000 3,000,000 2,000,000 5,000,000     14,800,000 9,527,000 7,695,000 5,624,000 6,314,000 7,566,000 6,275,000 4,477,000 4,186,000 4,027,000 3,097,000 1,425,000 1,276,000 1,519,000 1,665,000 1,394,000  
      interest expense
    -88,000,000 -87,000,000 -95,000,000 -96,000,000 -101,000,000 -102,000,000 -102,000,000 -108,000,000 -110,000,000 -101,000,000 -36,000,000 -36,000,000 -33,000,000 -32,000,000 -32,000,000 -32,000,000 -30,000,000 -33,000,000 -33,000,000 -29,000,000 -24,000,000 -24,000,000 -26,000,000 -26,000,000 -27,000,000 -29,000,000 -31,000,000 -37,000,000 -38,000,000 -38,000,000 -37,000,000 -38,000,000 -36,000,000 -34,000,000 -36,000,000 -37,000,000 -37,000,000 -37,000,000 -32,000,000 -28,000,000 -28,000,000 -28,000,000 -27,000,000 -28,000,000 -29,000,000 -29,000,000 -30,000,000 -30,000,000 -30,000,000 -32,000,000 -26,000,000 -24,000,000 -24,000,000 -24,000,000 -24,000,000 -24,000,000 -26,000,000 -30,000,000 -31,000,000 -30,000,000 -26,000,000 -25,000,000 -26,000,000 -25,000,000 -25,000,000 -26,000,000 -25,000,000 -27,000,000     -2,375,000 -23,434,000 -23,586,000 -23,468,000 -24,593,000 -25,655,000 -24,406,000 -16,444,000 -8,102,000 -4,740,000 -4,634,000 -2,862,000      
      net gain on divestitures
    49,000,000 -2,000,000 39,000,000                                                                                       
      other income
      1,000,000 -1,000,000 6,000,000 1,000,000 12,000,000 1,000,000 5,000,000 1,000,000 -6,000,000  -6,000,000 6,000,000 8,000,000 -6,000,000 38,000,000 42,000,000  1,000,000  1,000,000  5,000,000                                             -110,616,000 -65,588,000 -3,778,000 63,446,000                  
      net income from unconsolidated investees
    10,000,000 24,000,000 23,000,000 27,000,000 9,000,000 1,000,000 2,000,000 3,000,000 1,000,000 -12,000,000 -11,000,000 14,000,000 8,000,000 8,000,000 9,000,000 7,000,000 -38,000,000 6,000,000 27,000,000 57,000,000 -27,000,000 54,000,000 26,000,000 17,000,000 13,000,000 15,000,000 10,000,000 45,000,000 5,000,000 6,000,000 5,000,000 2,000,000 5,000,000 4,000,000 2,000,000 4,000,000 -4,000,000 2,000,000 1,000,000 2,000,000 1,000,000 2,000,000 1,000,000 14,000,000                                              
      income before income taxes
    580,000,000 529,000,000 548,000,000 488,000,000 439,000,000 356,000,000 341,000,000 312,000,000 278,000,000 391,000,000 337,000,000 396,000,000 322,000,000 382,000,000 397,000,000 374,000,000 314,000,000 371,000,000 454,000,000 395,000,000 267,000,000 357,000,000 316,000,000 273,000,000 252,000,000 215,000,000 239,000,000 313,000,000 328,000,000 209,000,000 288,000,000 239,000,000 213,000,000 236,000,000 213,000,000 217,000,000 -405,000,000 199,000,000 146,000,000 195,000,000 219,000,000 206,000,000 192,000,000 14,000,000 97,000,000 179,000,000 162,000,000 156,000,000 235,000,000 171,000,000 135,000,000 59,000,000 153,000,000 134,000,000 125,000,000 137,000,000 120,000,000 170,000,000 131,000,000 152,000,000 148,000,000 143,000,000 146,000,000 89,000,000 51,000,000 84,000,000 114,000,000 142,000,000 76,517,000 99,219,000 150,217,000 196,212,000 132,141,000 536,581,000 94,333,000 30,848,000 26,905,750 49,904,000 27,739,000 29,980,000          
      income tax provision
    62,000,000 106,000,000 96,000,000 93,000,000 84,000,000 51,000,000 119,000,000 79,000,000 82,000,000 97,000,000 70,000,000 95,000,000 82,000,000 88,000,000 90,000,000 91,000,000 55,000,000 83,000,000 113,000,000 97,000,000 42,000,000 93,000,000 75,000,000 70,000,000 49,000,000 65,000,000 65,000,000 66,000,000 372,000,000 46,000,000 126,000,000 62,000,000 -33,000,000 65,000,000 66,000,000 48,000,000 -180,000,000 68,000,000 76,000,000 63,000,000 71,000,000 68,000,000 60,000,000 5,000,000 11,000,000 56,000,000 61,000,000 53,000,000 94,000,000 58,000,000 47,000,000 17,000,000 68,000,000 45,000,000 33,000,000 53,000,000 39,000,000 61,000,000 40,000,000 49,000,000 13,000,000 43,000,000 51,000,000 29,000,000 9,000,000 25,000,000 46,000,000 48,000,000 39,753,000 39,103,000 48,580,000 74,849,000 53,178,000 171,588,000 38,205,000 12,532,000 42,487,000 19,678,000 11,095,000 11,992,000 12,316,000 12,891,000 10,815,000 8,550,000      
      net income
    518,000,000 423,000,000 452,000,000 395,000,000 355,000,000 305,000,000 222,000,000 233,000,000 196,000,000 294,000,000 267,000,000 301,000,000 240,000,000 294,000,000 307,000,000 283,000,000                     -225,000,000 131,000,000 70,000,000  148,000,000 138,000,000 132,000,000  86,000,000 123,000,000 101,000,000 103,000,000 141,000,000 113,000,000 88,000,000 42,000,000 85,000,000 89,000,000 92,000,000 84,000,000 81,000,000 109,000,000 91,000,000 103,000,000 135,000,000 100,000,000 95,000,000 60,000,000 42,000,000 59,000,000 68,000,000 94,000,000 36,764,000 60,116,000 101,637,000 121,363,000 78,963,000 364,993,000 56,128,000 18,316,000 63,035,000 30,226,000 16,644,000 17,988,000 17,146,000 17,802,000 13,971,000 12,771,000 7,431,000 -5,485,000 4,785,000 4,631,000  
      net loss attributable to noncontrolling interests
         1,000,000  1,000,000 1,000,000   1,000,000 1,000,000   1,000,000                         250,000  1,000,000          1,000,000    1,000,000 1,000,000                                
      net income attributable to nasdaq
    518,000,000 423,000,000 452,000,000 395,000,000 355,000,000 306,000,000 222,000,000 234,000,000 197,000,000 294,000,000 267,000,000 302,000,000 241,000,000 294,000,000 307,000,000 284,000,000 259,000,000 288,000,000 341,000,000 298,000,000 225,000,000 264,000,000 241,000,000 203,000,000 203,000,000 150,000,000 174,000,000 247,000,000 -44,000,000 163,000,000 162,000,000 177,000,000 246,000,000 171,000,000 147,000,000 169,000,000 -225,000,000 131,000,000 70,000,000 132,000,000 148,000,000 138,000,000 133,000,000 9,000,000 86,000,000 123,000,000                                            
      yoy
    45.92% 38.24% 103.60% 68.80% 80.20% 4.08% -16.85% -22.52% -18.26% 0.00% -13.03% 6.34% -6.95% 2.08% -9.97% -4.70% 15.11% 9.09% 41.49% 46.80% 10.84% 76.00% 38.51% -17.81% -561.36% -7.98% 7.41% 39.55% -117.89% -4.68% 10.20% 4.73% -209.33% 30.53% 110.00% 28.03% -252.03% -5.07% -47.37% 1366.67% 72.09% 12.20%                                                
      qoq
    22.46% -6.42% 14.43% 11.27% 16.01% 37.84% -5.13% 18.78% -32.99% 10.11% -11.59% 25.31% -18.03% -4.23% 8.10% 9.65% -10.07% -15.54% 14.43% 32.44% -14.77% 9.54% 18.72% 0.00% 35.33% -13.79% -29.55% -661.36% -126.99% 0.62% -8.47% -28.05% 43.86% 16.33% -13.02% -175.11% -271.76% 87.14% -46.97% -10.81% 7.25% 3.76% 1377.78% -89.53% -30.08%                                             
      net income margin %
    24.39% 21.60% 21.63% 18.90% 17.49% 16.09% 12.39% 13.98% 11.96% 20.26% 18.63% 19.70% 15.23% 18.88% 19.78% 18.50% 17.66% 21.22% 24.15% 18.04% 15.39% 18.67% 17.24% 15.00% 19.06% 13.69% 16.40% 23.77% -3.87% 16.91% 15.77% 15.38% 24.02% 17.65% 14.70% 17.40% -23.12% 14.10% 7.80% 14.59% 17.11% 15.84% 16.48% 1.05% 9.35% 15.04% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%  
      per share information:
                                                                                             
      basic earnings per share
    0.91 0.74 0.79 0.69 0.62 0.53 0.39 0.41 0.34 0.6 0.54 0.62 0.49 0.6 1.87 1.72 1.54 1.72 2.08 1.81 1.36 1.61 1.47 1.23 1.23 0.91 1.05 1.49 -0.26 0.99 0.98 1.06 1.48 1.03 0.89 1.02 -1.37 0.79 0.42 0.8 0.9 0.83 0.79 0.05 0.51 0.73 0.6 0.61 0.84 0.68 0.53 0.26 0.52 0.53 0.55 0.49 0.47 0.62 0.52 0.59 0.69 0.51 0.46 0.29                    0.14      
      diluted earnings per share
    0.9 0.73 0.78 0.68 0.61 0.53 0.38 0.4 0.34 0.6 0.54 0.61 0.49 0.59 1.85 1.7 1.52 1.69 2.05 1.78 1.34 1.58 1.45 1.22 1.21 0.9 1.04 1.48 -0.26 0.97 0.97 1.05 1.45 1.01 0.87 0.99 -1.33 0.77 0.42 0.78 0.87 0.8 0.77 0.05 0.5 0.71 0.59 0.59 0.82 0.66 0.52 0.25 0.51 0.52 0.53 0.48 0.45 0.61 0.51 0.57 0.68 0.5 0.46 0.28                    0.13      
      cash dividends declared per common share
    0.27 0.27 0.27 0.24 0.24 0.24 0.24 0.22 0.22 0.22 0.22 0.2 0.2 0.2 0.6 0.54 0.54 0.54 0.54 0.49 0.49 0.49 0.49 0.47 0.47 0.47 0.47 0.44 0.44 0.44  0.82 0.38 0.38 0.38 0.32 0.32 0.32  0.57 0.25 0.25 0.25 0.15 0.15 0.15  0.28 0.13 0.13 0.13 0.13 0.13 0.13 0.13                                   
      computer operations and data communications
           67,000,000 65,000,000 58,000,000 56,000,000 54,000,000 57,000,000 50,000,000 50,000,000 50,000,000 49,000,000 47,000,000 46,000,000 44,000,000 42,000,000 39,000,000 35,000,000 35,000,000 35,000,000 33,000,000 33,000,000 33,000,000 33,000,000 32,000,000 30,000,000 32,000,000 34,000,000 31,000,000 30,000,000 30,000,000 31,000,000 28,000,000 27,000,000 25,000,000 26,000,000 23,000,000 23,000,000 35,000,000 25,000,000 22,000,000 23,000,000 22,000,000 24,000,000 22,000,000 20,000,000 15,000,000 9,000,000 18,000,000 17,000,000 17,000,000 15,000,000 17,000,000 16,000,000 17,000,000 15,000,000 13,000,000 14,000,000 16,000,000 16,000,000 14,000,000 14,000,000 15,000,000 12,482,000 16,418,000 17,394,000 8,177,000 5,940,000 6,642,000 7,916,000 8,196,000 11,768,000 9,488,000 10,264,000 9,952,000 14,890,000 15,394,000 15,945,000 16,159,000 17,660,000 22,613,000 27,427,000 31,204,000  
      market platforms
            703,250,000 892,000,000 905,000,000 1,032,000,000                                                                              
      anti-financial crime
            66,250,000 93,000,000 89,000,000 84,000,000                                                                              
      other expense
                                                                                             
      market technology
                96,750,000 132,000,000 131,000,000 124,000,000 131,000,000 114,000,000 117,000,000 100,000,000 106,000,000 86,000,000 84,000,000 81,000,000 99,000,000 84,000,000 79,000,000 77,000,000 76,000,000 68,000,000 66,000,000 70,000,000 88,000,000 77,000,000 72,000,000 67,000,000                 48,000,000 47,000,000 44,000,000 45,000,000 48,000,000 46,000,000 46,000,000 43,000,000 46,000,000 38,000,000 34,000,000 34,000,000 45,000,000 36,000,000 36,000,000 29,000,000 31,529,000 24,942,000 38,678,000 11,023,000                  
      investment intelligence
                212,750,000 284,000,000 283,000,000 284,000,000 289,000,000 272,000,000 263,000,000 258,000,000                                                                      
      corporate platforms
                126,000,000 168,000,000 168,000,000 168,000,000 162,000,000 155,000,000 154,000,000 155,000,000                                                                      
      net gain on divestiture of business
                    21,000,000  84,000,000         27,000,000                                                              
      corporate services
                        96,500,000 132,000,000 126,000,000 128,000,000 128,000,000 124,000,000 123,000,000 131,000,000 133,000,000 131,000,000 131,000,000 172,000,000 170,000,000 161,000,000 164,000,000 160,000,000                                                      
      information services
                        165,250,000 238,000,000 213,000,000 211,000,000 194,000,000 198,000,000 194,000,000 193,000,000 186,000,000 179,000,000 175,000,000 174,000,000 156,000,000 150,000,000 144,000,000 138,000,000 135,000,000 137,000,000 134,000,000 133,000,000 127,000,000 132,000,000 128,000,000 125,000,000 113,000,000 114,000,000 123,000,000 123,000,000 109,000,000 118,000,000 108,000,000 108,000,000                                      
      net gain on divestiture of businesses
                                 -8,000,000                                                            
      other investment income
                            250,000  1,000,000    8,000,000    1,000,000    2,000,000 1,000,000                                                  
      gain on divestiture of businesses, net of disposal costs
                                  41,000,000                                                           
      listing services
                                        50,500,000 68,000,000 68,000,000 66,000,000 68,000,000 66,000,000 66,000,000 64,000,000 61,000,000 59,000,000 60,000,000 58,000,000 58,000,000 57,000,000 58,000,000 55,000,000                                      
      technology solutions
                                        116,000,000 167,000,000 163,000,000 134,000,000 147,000,000 131,000,000 135,000,000 130,000,000 139,000,000 130,000,000 138,000,000 135,000,000 149,000,000 131,000,000 95,000,000 73,000,000                                      
      net income attributable to noncontrolling interests
                                                          1,000,000 1,000,000   1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000   1,000,000                       
      cost of revenues:
                                                                                             
      total cost of revenues
                                                -257,750,000 -321,000,000 -342,000,000 -369,000,000 -329,000,000 -299,000,000 -363,000,000 -326,000,000 -333,000,000 -334,000,000 -399,000,000 -390,000,000 -416,000,000 -508,000,000 -422,000,000 -402,000,000 -405,000,000 -379,000,000 -486,000,000 -404,000,000 -447,000,000 -461,000,000 -522,000,000 -526,000,000 -620,454,000 -591,342,000 -441,325,000 -535,494,000 -452,936,000 -442,017,000 -359,521,000 -369,880,000 -264,390,000 -231,709,000 -239,881,000 -234,221,000 120,947,000 89,821,000 89,225,000       
      revenues less transaction rebates, brokerage, clearance and exchange fees
                                                387,250,000 497,000,000 523,000,000 529,000,000 520,000,000 506,000,000 451,000,000 418,000,000 419,000,000 409,000,000 424,000,000 411,000,000 421,000,000 438,000,000 416,000,000 415,000,000                              
      voluntary accommodation program
                                                    -18,000,000   62,000,000                                      
      asset impairment charges
                                                    -4,000,000   -10,000,000   -28,000,000                                   
      income from unconsolidated investees
                                                             1,000,000 1,000,000   1,000,000 1,000,000  -87,000,000  -18,000,000 -2,000,000                      
      net (income) loss attributable to noncontrolling interests
                                                                    1,000,000 1,000,000                        
      net income attributable to nasdaq omx
                                                  101,000,000 103,000,000 141,000,000 113,000,000 88,000,000 42,000,000 86,000,000 89,000,000 93,000,000 85,000,000 81,000,000 110,000,000 92,000,000 104,000,000 137,000,000 101,000,000 96,000,000 61,000,000 43,000,000 60,000,000 69,000,000 94,000,000                      
      loss on divestiture of business
                                                                                             
      restructuring and other charges
                                                       9,000,000                                      
      issuer services
                                                        101,000,000 93,000,000 91,000,000 90,000,000 93,000,000 92,000,000 93,000,000 91,000,000 89,000,000 85,000,000 86,000,000 84,000,000 83,000,000 80,000,000 82,000,000 79,000,000 82,257,000 85,047,000 87,622,000 75,688,000 73,564,000 73,229,000 70,742,000 66,351,000 67,016,000 59,742,000 63,380,000 58,878,000 59,285,000 55,783,000 56,060,000 54,906,000 51,886,000 50,646,000 51,056,000   
      loss on sale of business
                                                        -3,500,000 -14,000,000                                    
      dividend and investment income
                                                             1,000,000  -1,000,000   1,000,000   1,000,000 1,000,000                       
      asset impairment charge
                                                           -12,000,000                                  
      basic and diluted earnings per share:
                                                                                             
      other
                                                                   1,000,000 2,000,000 3,000,000 3,000,000 3,000,000 2,237,000 1,131,000 1,093,000 152,000 82,000 64,000 69,000 102,000 52,000 80,000 65,000 267,000 26,000 34,000  202,000 12,000 20,000 26,000 45,000  
      loss on divestiture of businesses
                                                                  -11,000,000                           
      revenues
                                                                                             
      cost of revenues
                                                                                       -53,915,000      
      operating expenses
                                                                                             
      liquidity rebates
                                                                -247,500,000 -297,000,000 -374,000,000 -320,000,000 -308,000,000 -329,000,000 -381,000,000 -455,000,000 -528,390,000 -484,366,000 -346,767,000 -384,771,000 -295,069,000 -291,240,000 -238,313,000 -225,190,000 -153,833,000 -153,196,000 -170,633,000 -167,198,000 86,128,000 64,818,000 69,180,000       
      revenues less liquidity rebates, brokerage, clearance and exchange fees
                                                                280,250,000 372,000,000 390,000,000 360,000,000 369,000,000 349,000,000 367,000,000 369,000,000 402,555,000 399,038,000 380,153,000 278,332,000 211,550,000 209,944,000 198,680,000               
      loss on sale of investment security
                                                                      -5,000,000                       
      debt conversion expense
                                                                     -25,000,000                        
      merger expenses
                                                                    1,000,000 5,000,000 3,000,000 8,000,000 9,495,000 8,475,000 5,704,000 1,461,000                  
      loss on foreign currency contracts
                                                                                             
      basic and diluted earnings per share:
                                                                                             
      basic
                                                                    0.275 0.3 0.34 0.47 0.378 0.3 0.51 0.75   0.5 0.16 0.158 0.27 0.16 0.2 0.123 0.2 0.15       
      diluted
                                                                    0.263 0.28 0.33 0.44 0.355 0.28 0.48 0.69   0.39 0.14 0.128 0.22 0.13 0.16 0.105 0.16 0.13       
      gain on foreign currency contracts
                                                                                             
      net expense attributable to noncontrolling interests
                                                                                             
      minority interests
                                                                        -332,250 -249,000 -827,000 -253,000                  
      benefit from bad debts
                                                                          -1,113,000  573,000 162,000  3,490,000              
      provision for bad debts
                                                                           966,000   -1,359,000  724,000 -2,152,000 1,843,000 49,000 3,039,000 134,000 -745,000 570,000 -247,000 772,000 406,000 142,000  
      total direct expenses
                                                                            110,036,000 126,096,000 99,744,000 110,703,000 106,977,000 94,724,000 125,716,000 112,090,000 94,940,000 88,783,000 93,697,000 93,148,000 110,109,000 112,639,000 99,686,000 108,391,000  
      support costs from related parties
                                                                                7,982,000 8,567,000 9,105,000 8,117,000 10,468,000 10,499,000 10,441,000 10,372,000 11,295,000 11,120,000 11,764,000 11,409,000  
      gain on foreign currency option contracts
                                                                            18,202,000 35,257,000                
      dividend income
                                                                              14,540,000  7,004,000  9,223,000           
      gain on sale of strategic initiative
                                                                             431,383,000                
      strategic initiative costs
                                                                              -1,584,000 -24,927,000              
      minority interest
                                                                               96,000 315,000 134,000 317,000 136,000 158,000 44,000        
      net income applicable to common stockholders:
                                                                                             
      preferred stock:
                                                                                             
      dividends declared
                                                                                   -359,000 -714,000 -716,000 -785,000 -1,004,000      
      accretion of preferred stock
                                                                                   -331,000 -330,000 -660,000 -1,459,000 -927,000      
      net income applicable to common stockholders
                                                                            78,963,000 364,993,000 56,128,000 18,316,000 63,035,000 30,226,000 16,644,000 17,298,000 16,102,000 16,426,000 11,727,000 10,840,000   1,238,000 1,832,000  
      loss on foreign currency option contracts
                                                                              -1,668,000 -7,841,000              
      gross margin
                                                                               192,067,000 183,050,000 171,150,000 171,151,000 162,018,000 138,628,000 130,644,000 130,461,000 126,278,000 121,386,000 114,793,000    
      yoy
                                                                               18.55% 32.04% 31.00% 31.19% 28.30% 14.20% 13.81%        
      qoq
                                                                               4.93% 6.95% -0.00% 5.64% 16.87% 6.11% 0.14% 3.31% 4.03% 5.74%     
      gross margin %
    0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 34.18% 40.91% 42.48% 41.64% 40.89% 53.41% 59.26% 59.39% 70.08% 72.23% 92.60% 0% 0%  
      expenses
                                                                                             
      general and administrative
                                                                                9,332,000 5,773,000 24,793,000 6,762,000 -3,903,000 7,350,000 10,582,000 5,441,000 17,308,000 15,648,000 3,313,000 4,859,000  
      total expenses
                                                                                114,959,000 103,291,000 134,821,000 120,207,000 105,408,000 99,282,000 104,138,000 103,520,000 121,404,000 123,759,000 111,450,000 119,800,000  
      pre-tax operating income
                                                                                    19,200,000 30,693,000 24,786,000 21,321,000      
      elimination of non-core product lines, initiatives and severance
                                                                                             
      nasdaq japan impairment loss
                                                                                             
      operating (loss) income
                                                                                        2,050,250     
      operating (loss) income from continuing operations before income taxes
                                                                                        1,041,500     
      benefit (provision) for income taxes
                                                                                         4,835,000    
      net income from continuing operations
                                                                                        -2,127,000 -5,485,000 4,785,000 4,631,000  
      loss from discontinued operations
                                                                                             
      gain on disposition of discontinued operations
                                                                                             
      net loss applicable to common stockholders:
                                                                                             
      preferred stock dividends declared
                                                                                             
      net loss applicable to common stockholders
                                                                                        -854,750 -6,489,000    
      basic and diluted net loss per share:
                                                                                             
      continuing operations
                                                                                        -0.1 -0.08 0.02 0.02  
      discontinued operations
                                                                                             
      total basic and diluted net loss per share
                                                                                        -0.01 -0.08    
      operating income (loss) from continuing operations before income taxes
                                                                                          7,361,000   
      (provision) benefit for income taxes
                                                                                             
      loss from discontinued operations, net of tax
                                                                                             
      basic and diluted net earnings per share:
                                                                                             
      total basic and diluted net earnings per share
                                                                                          0.02 0.02  
      market services:
                                                                                             
      transaction services
                                                                                           48,360,000  
      market information services
                                                                                           27,766,000  
      total market services
                                                                                           76,126,000  
      issuer services:
                                                                                             
      corporate client group
                                                                                           40,454,000  
      nasdaq financial products
                                                                                           11,779,000  
      total issuer services
                                                                                           52,233,000  
      operating income from continuing operations before income taxes
                                                                                           7,125,000  
      provision for income taxes
                                                                                             
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 
                                                                                               
        assets
                                                                                               
        current assets:
                                                                                               
        cash and cash equivalents
      604,000,000 470,000,000 732,000,000 690,000,000 592,000,000 266,000,000 416,000,000 388,000,000 453,000,000 5,340,000,000 5,347,000,000 373,000,000 502,000,000 301,000,000 454,000,000 486,000,000 393,000,000 303,000,000 390,000,000 774,000,000 2,745,000,000 584,000,000 711,000,000 1,015,000,000 332,000,000 304,000,000 333,000,000 472,000,000 545,000,000 324,000,000 322,000,000 405,000,000 377,000,000 530,000,000 356,000,000 386,000,000 403,000,000 257,000,000 344,000,000 331,000,000 301,000,000 290,000,000 324,000,000 328,000,000 427,000,000 286,000,000 314,000,000 384,000,000 425,000,000 300,000,000 379,000,000 591,000,000 497,000,000 438,000,000 491,000,000 525,000,000 506,000,000 543,000,000 578,000,000 439,000,000 315,000,000 336,000,000 526,000,000 535,000,000 594,000,000 311,000,000 419,000,000 333,000,000 565,760,000 737,900,000 739,999,000 736,020,000 1,325,314,000 1,258,662,000 574,998,000 493,249,000 321,995,000 440,545,000 488,817,000 374,905,000 165,237,000 288,764,000 304,286,000 83,941,000 58,186,000 47,986,000 222,385,000 133,608,000 148,929,000 
        restricted cash and cash equivalents
      210,000,000 227,000,000 195,000,000 18,000,000 31,000,000 42,000,000 24,000,000 21,000,000 20,000,000 25,000,000 23,000,000 57,000,000 22,000,000 51,000,000 30,000,000 31,000,000 29,000,000 29,000,000 40,000,000 38,000,000 37,000,000 33,000,000                                                                    
        default funds and margin deposits
      5,842,000,000 5,750,000,000 5,218,000,000 5,686,000,000 5,664,000,000 5,865,000,000 5,546,000,000 5,595,000,000 7,275,000,000 5,935,000,000 7,134,000,000 7,055,000,000 7,021,000,000 9,507,000,000 8,688,000,000 6,570,000,000 5,911,000,000 4,202,000,000 3,579,000,000 3,737,000,000 3,942,000,000 3,378,000,000 3,098,000,000 3,241,000,000 2,996,000,000 2,422,000,000 3,161,000,000 3,274,000,000 4,742,000,000 4,219,000,000 4,441,000,000 4,026,000,000 3,988,000,000 3,893,000,000 3,671,000,000 3,633,000,000 3,301,000,000 3,323,000,000 3,411,000,000 3,614,000,000 2,228,000,000 2,175,000,000 2,331,000,000 2,635,000,000 2,194,000,000 2,513,000,000 2,579,000,000 2,253,000,000 1,961,000,000 1,934,000,000 1,412,000,000 229,000,000 209,000,000 194,000,000 204,000,000 158,000,000                                  
        financial investments
      28,000,000 53,000,000 84,000,000 201,000,000 184,000,000 202,000,000 174,000,000 173,000,000 188,000,000 272,000,000 288,000,000 197,000,000 181,000,000 129,000,000 161,000,000 225,000,000 208,000,000 185,000,000 235,000,000 215,000,000 195,000,000 177,000,000 206,000,000 254,000,000 291,000,000                                                                 
        receivables
      943,000,000 865,000,000 896,000,000 986,000,000 1,022,000,000 944,000,000 960,000,000 925,000,000 929,000,000 595,000,000 597,000,000 666,000,000 677,000,000 638,000,000 652,000,000 621,000,000 588,000,000 552,000,000 559,000,000 574,000,000 566,000,000 504,000,000 523,000,000 568,000,000 422,000,000 399,000,000 415,000,000 447,000,000 384,000,000 356,000,000 405,000,000 486,000,000 423,000,000 320,000,000 392,000,000 467,000,000 429,000,000 349,000,000 399,000,000 333,000,000 316,000,000 278,000,000 323,000,000 344,000,000 389,000,000 370,000,000 395,000,000 434,000,000 393,000,000 372,000,000 362,000,000 317,000,000 333,000,000 327,000,000 341,000,000 327,000,000 308,000,000 347,000,000 344,000,000 327,000,000 298,000,000 308,000,000 361,000,000 377,000,000 301,000,000 379,000,000 383,000,000 355,000,000 338,564,000 375,625,000 354,931,000 403,614,000 249,524,000 274,144,000 284,606,000 299,197,000 233,266,000   241,018,000 207,632,000 133,276,000 112,860,000 108,016,000 104,258,000 92,282,000 74,192,000 111,452,000 111,405,000 
        other current assets
      376,000,000 232,000,000 227,000,000 237,000,000 293,000,000 239,000,000 189,000,000 219,000,000 231,000,000 184,000,000 189,000,000 192,000,000 201,000,000 225,000,000 233,000,000 245,000,000 294,000,000 225,000,000 214,000,000 316,000,000 175,000,000 134,000,000 148,000,000 163,000,000 219,000,000 144,000,000 165,000,000 256,000,000 390,000,000 304,000,000 212,000,000 205,000,000 187,000,000 175,000,000 184,000,000 163,000,000 167,000,000 160,000,000 165,000,000 164,000,000 158,000,000 157,000,000 152,000,000 145,000,000 151,000,000 162,000,000 166,000,000 150,000,000 126,000,000 141,000,000 154,000,000 124,000,000 112,000,000 116,000,000 126,000,000 129,000,000 110,000,000 126,000,000 127,000,000 108,000,000 93,000,000 166,000,000 125,000,000 136,000,000 112,000,000 198,000,000 171,000,000 170,000,000 140,726,000 214,990,000 196,987,000 181,231,000 96,385,000 64,194,000 40,085,000 26,512,000 117,978,000 34,587,000 35,537,000 38,711,000 34,754,000 56,430,000 25,684,000 19,250,000 12,802,000 14,134,000 11,512,000 13,900,000 11,623,000 
        total current assets
      8,003,000,000 7,597,000,000 7,352,000,000 7,818,000,000 7,786,000,000 7,558,000,000 7,309,000,000 7,321,000,000 9,096,000,000 12,351,000,000 13,578,000,000 8,540,000,000 8,604,000,000 10,851,000,000 10,218,000,000 8,178,000,000 7,423,000,000 5,496,000,000 5,017,000,000 5,654,000,000 7,660,000,000 4,810,000,000 4,716,000,000 5,270,000,000 4,290,000,000 3,499,000,000 4,363,000,000 4,736,000,000 6,370,000,000 5,457,000,000 5,727,000,000 5,638,000,000 5,529,000,000 5,446,000,000 4,921,000,000 4,947,000,000 4,560,000,000 4,346,000,000 4,596,000,000 4,722,000,000 3,284,000,000 3,160,000,000 3,446,000,000 3,688,000,000 3,400,000,000 3,557,000,000 3,718,000,000 3,519,000,000 3,163,000,000 3,072,000,000 2,610,000,000 1,608,000,000 1,492,000,000 1,329,000,000 1,410,000,000 1,406,000,000 6,573,000,000 5,677,000,000 6,429,000,000 10,175,000,000 8,510,000,000 2,880,000,000 2,888,000,000 3,221,000,000 3,454,000,000 4,912,000,000 4,437,000,000 5,302,000,000 5,435,452,000 2,320,912,000 2,163,586,000 1,935,014,000 1,682,017,000 1,710,930,000 2,612,712,000 2,368,822,000 2,312,546,000 2,134,795,000 1,988,688,000 889,288,000 596,963,000 746,237,000 696,371,000 495,621,000 406,197,000 398,850,000 546,245,000 561,184,000 529,617,000 
        property and equipment
      728,000,000 689,000,000 656,000,000 621,000,000 593,000,000 584,000,000 556,000,000 575,000,000 576,000,000 542,000,000 536,000,000 529,000,000 532,000,000 518,000,000 514,000,000 511,000,000 509,000,000 495,000,000 493,000,000 482,000,000 475,000,000 435,000,000 396,000,000 375,000,000 384,000,000 361,000,000 390,000,000 370,000,000 376,000,000 371,000,000 370,000,000 384,000,000 400,000,000 379,000,000 384,000,000 376,000,000 362,000,000 342,000,000 332,000,000 326,000,000 323,000,000 305,000,000 295,000,000 281,000,000 292,000,000 288,000,000 280,000,000 266,000,000 268,000,000 249,000,000 227,000,000 215,000,000 211,000,000 203,000,000 198,000,000 195,000,000 193,000,000 168,000,000 165,000,000 166,000,000 164,000,000 160,000,000 154,000,000 161,000,000 164,000,000 165,000,000 170,000,000 165,000,000 182,943,000 192,800,000 160,056,000 189,786,000 64,523,000 62,010,000 60,537,000 61,893,000 65,269,000 62,949,000            
        goodwill
      14,371,000,000 14,336,000,000 14,328,000,000 14,179,000,000 13,957,000,000 14,165,000,000 13,984,000,000 13,974,000,000 14,112,000,000 7,988,000,000 8,020,000,000 8,103,000,000 8,099,000,000 7,946,000,000 8,151,000,000 8,338,000,000 8,433,000,000 8,510,000,000 8,585,000,000 8,508,000,000 6,850,000,000 6,600,000,000 6,488,000,000 6,326,000,000 6,366,000,000 6,232,000,000 6,382,000,000 6,380,000,000 6,363,000,000 6,369,000,000 6,355,000,000 6,549,000,000 6,586,000,000 6,154,000,000 6,237,000,000 6,070,000,000 6,027,000,000 6,206,000,000 6,236,000,000 5,663,000,000 5,395,000,000 5,421,000,000 5,469,000,000 5,350,000,000 5,538,000,000 5,802,000,000 6,068,000,000 6,173,000,000 6,186,000,000 6,191,000,000 6,048,000,000 5,309,000,000 5,335,000,000 5,286,000,000 5,103,000,000 5,210,000,000 5,061,000,000 5,046,000,000 5,345,000,000 5,339,000,000 5,127,000,000 5,041,000,000 4,526,000,000 4,770,000,000 4,800,000,000 4,922,000,000 4,591,000,000 4,381,000,000 4,492,422,000 4,681,759,000 4,074,588,000 3,918,636,000 980,736,000 975,740,000 1,029,031,000 1,028,926,000 1,028,746,000 999,285,000 988,277,000 988,462,000 961,893,000 143,810,000 142,417,000 141,958,000 141,381,000 141,730,000    
        intangible assets
      6,511,000,000 6,620,000,000 6,741,000,000 6,830,000,000 6,905,000,000 7,072,000,000 7,171,000,000 7,291,000,000 7,443,000,000 2,446,000,000 2,490,000,000 2,545,000,000 2,581,000,000 2,583,000,000 2,670,000,000 2,751,000,000 2,813,000,000 2,885,000,000 2,943,000,000 2,967,000,000 2,255,000,000 2,218,000,000 2,215,000,000 2,200,000,000 2,249,000,000 2,239,000,000 2,304,000,000 2,329,000,000 2,300,000,000 2,328,000,000 2,351,000,000 2,432,000,000 2,468,000,000 2,091,000,000 2,102,000,000 2,082,000,000 2,094,000,000 2,740,000,000 2,771,000,000 2,085,000,000 1,959,000,000 1,981,000,000 2,009,000,000 1,995,000,000 2,077,000,000 2,213,000,000 2,313,000,000 2,362,000,000 2,386,000,000 2,409,000,000 2,383,000,000 1,619,000,000 1,650,000,000 1,645,000,000 1,625,000,000 1,680,000,000 1,648,000,000 1,657,000,000 1,767,000,000 1,773,000,000 1,719,000,000 1,680,000,000 1,513,000,000 1,607,000,000 1,631,000,000 1,675,000,000 1,581,000,000 1,536,000,000 1,582,864,000 2,407,257,000 2,039,653,000 2,214,228,000 181,612,000 186,511,000 189,794,000 194,706,000 199,619,000 204,604,000 207,251,000 216,475,000 215,478,000 37,996,000 39,284,000 40,523,000 40,791,000 42,399,000    
        operating lease assets
      447,000,000 440,000,000 441,000,000 381,000,000 375,000,000 388,000,000 400,000,000 400,000,000 402,000,000 397,000,000 410,000,000 427,000,000 444,000,000 448,000,000 462,000,000 470,000,000 366,000,000 383,000,000 383,000,000 396,000,000 381,000,000 387,000,000 405,000,000 324,000,000 346,000,000 346,000,000 365,000,000 378,000,000                                                              
        other non-current assets
      993,000,000 972,000,000 865,000,000 818,000,000 779,000,000 793,000,000 790,000,000 706,000,000 665,000,000 626,000,000 623,000,000 631,000,000 608,000,000 595,000,000 581,000,000 575,000,000 571,000,000 628,000,000 562,000,000 483,000,000 358,000,000 381,000,000 339,000,000 303,000,000 289,000,000 303,000,000 328,000,000 310,000,000 291,000,000 330,000,000 338,000,000 371,000,000 412,000,000 391,000,000 383,000,000 398,000,000 390,000,000 406,000,000 423,000,000 317,000,000 281,000,000 273,000,000 264,000,000 276,000,000 244,000,000 247,000,000 255,000,000 243,000,000 170,000,000 166,000,000 182,000,000 121,000,000 125,000,000 129,000,000 94,000,000 101,000,000 119,000,000 119,000,000 133,000,000                               
        total assets
      31,053,000,000 30,654,000,000 30,383,000,000 30,647,000,000 30,395,000,000 30,560,000,000 30,210,000,000 30,267,000,000 32,294,000,000 24,350,000,000 25,657,000,000 20,775,000,000 20,868,000,000 22,941,000,000 22,596,000,000 20,823,000,000 20,115,000,000 18,397,000,000 17,983,000,000 18,490,000,000 17,979,000,000 14,831,000,000 14,559,000,000 14,798,000,000 13,924,000,000 12,980,000,000 14,132,000,000 14,503,000,000 15,700,000,000 14,855,000,000 15,141,000,000 15,790,000,000 15,786,000,000 15,072,000,000 14,660,000,000 14,490,000,000 14,150,000,000 14,808,000,000 15,099,000,000 13,717,000,000 11,861,000,000 11,770,000,000 12,104,000,000 12,242,000,000 12,087,000,000 12,692,000,000 13,116,000,000 12,978,000,000 12,577,000,000 12,486,000,000 11,953,000,000 9,188,000,000 9,132,000,000 8,920,000,000 8,927,000,000 9,021,000,000 14,091,000,000 13,157,000,000 14,217,000,000 18,065,000,000 16,207,000,000 10,355,000,000 9,910,000,000 10,519,000,000 10,722,000,000 12,342,000,000 11,660,000,000 12,453,000,000 12,694,875,000 10,218,646,000 8,968,985,000 8,791,307,000 2,979,397,000 3,000,018,000 4,005,313,000 3,767,243,000 3,716,452,000 3,542,395,000 3,415,234,000 2,346,547,000 2,046,786,000 1,113,238,000 1,072,006,000 887,489,000 814,820,000 850,535,000 855,085,000 873,471,000 851,254,000 
        liabilities
                                                                                               
        current liabilities:
                                                                                               
        accounts payable and accrued expenses
      280,000,000 256,000,000 246,000,000 255,000,000 269,000,000 289,000,000 301,000,000 266,000,000 332,000,000 286,000,000 199,000,000 183,000,000 185,000,000 189,000,000 175,000,000 186,000,000 185,000,000 166,000,000 168,000,000 183,000,000 175,000,000 145,000,000 129,000,000 183,000,000 148,000,000 146,000,000 149,000,000 218,000,000 198,000,000 176,000,000 174,000,000 237,000,000 177,000,000 168,000,000 149,000,000 187,000,000 175,000,000 159,000,000 172,000,000 175,000,000 158,000,000 173,000,000 188,000,000 207,000,000 189,000,000 182,000,000 188,000,000 227,000,000 228,000,000 255,000,000 252,000,000 217,000,000 172,000,000 149,000,000 160,000,000 147,000,000 164,000,000 175,000,000 180,000,000 151,000,000 142,000,000 138,000,000 172,000,000 152,000,000 119,000,000 229,000,000 236,000,000 242,000,000 242,356,000 287,773,000 219,866,000 208,837,000 115,114,000 127,530,000 124,309,000 200,903,000 170,753,000 118,390,000 112,092,000 112,635,000 118,884,000 56,186,000 46,217,000 42,778,000 40,180,000 37,288,000 22,669,000 24,556,000 29,959,000 
        section 31 fees payable to sec
        411,000,000 264,000,000 319,000,000 74,000,000 213,000,000 70,000,000 84,000,000 19,000,000 184,000,000 125,000,000 243,000,000 62,000,000 175,000,000 53,000,000 62,000,000 14,000,000 172,000,000 131,000,000 224,000,000 63,000,000 318,000,000 161,000,000 132,000,000 34,000,000 170,000,000 69,000,000 109,000,000 21,000,000 225,000,000 128,000,000 128,000,000 31,000,000 169,000,000 81,000,000 108,000,000 27,000,000 160,000,000 80,000,000 98,000,000 25,000,000 147,000,000 82,000,000 124,000,000        97,000,000 24,000,000 156,000,000 69,000,000 106,000,000 30,000,000 147,000,000 70,000,000 82,000,000 19,000,000 137,000,000 57,000,000 137,000,000 41,000,000 114,000,000 24,000,000 49,382,000 14,358,000 109,723,000 77,686,000 103,574,000 19,715,000 132,279,000               
        accrued personnel costs
      364,000,000 313,000,000 280,000,000 198,000,000 325,000,000 314,000,000 213,000,000 188,000,000 303,000,000 211,000,000 156,000,000 157,000,000 243,000,000 205,000,000 161,000,000 168,000,000 252,000,000 221,000,000 172,000,000 174,000,000 227,000,000 184,000,000 149,000,000 132,000,000 188,000,000 137,000,000 119,000,000 118,000,000 199,000,000 145,000,000 115,000,000 111,000,000 170,000,000 130,000,000 124,000,000 110,000,000 207,000,000 175,000,000 129,000,000 87,000,000 171,000,000 121,000,000 94,000,000 71,000,000 143,000,000 110,000,000 100,000,000 96,000,000 154,000,000 115,000,000 84,000,000 59,000,000 111,000,000 86,000,000 74,000,000 56,000,000 132,000,000 105,000,000 88,000,000 71,000,000 122,000,000 97,000,000 74,000,000 60,000,000 125,000,000 112,000,000 97,000,000 83,000,000 156,795,000 132,706,000 93,688,000 82,762,000 64,625,000 47,127,000 34,112,000 25,289,000 55,565,000 42,305,000 36,166,000 32,158,000 55,284,000 37,584,000 28,369,000 19,548,000 49,383,000 45,933,000 33,718,000 33,115,000 48,817,000 
        deferred revenue
      785,000,000 719,000,000 848,000,000 981,000,000 711,000,000 663,000,000 736,000,000 866,000,000 594,000,000 451,000,000 558,000,000 664,000,000 357,000,000 415,000,000 512,000,000 619,000,000 329,000,000 380,000,000 451,000,000 519,000,000 235,000,000 290,000,000 351,000,000 416,000,000 211,000,000 267,000,000 333,000,000 402,000,000 194,000,000 257,000,000 310,000,000 386,000,000 189,000,000 204,000,000 265,000,000 322,000,000 162,000,000 216,000,000 275,000,000 304,000,000 127,000,000 164,000,000 231,000,000 282,000,000 177,000,000 191,000,000 230,000,000 276,000,000 151,000,000 187,000,000 222,000,000 250,000,000 139,000,000 165,000,000 201,000,000 237,000,000 124,000,000 152,000,000 202,000,000 237,000,000 122,000,000 156,000,000 188,000,000 221,000,000 105,000,000 137,000,000 171,000,000 189,000,000 86,328,000 124,152,000 164,506,000 203,195,000 60,537,000 93,779,000 128,671,000 161,606,000 56,447,000 86,658,000 114,869,000 140,602,000 53,593,000 84,622,000 115,338,000 143,197,000 59,537,000 84,013,000 105,856,000 126,563,000 59,739,000 
        other current liabilities
      259,000,000 236,000,000 154,000,000 187,000,000 215,000,000 229,000,000 234,000,000 184,000,000 146,000,000 146,000,000 140,000,000 173,000,000 122,000,000 158,000,000 140,000,000 157,000,000 115,000,000 132,000,000 132,000,000 377,000,000 121,000,000 101,000,000 204,000,000 171,000,000 161,000,000 147,000,000 132,000,000 321,000,000 253,000,000 173,000,000 115,000,000 161,000,000 85,000,000 94,000,000 115,000,000 174,000,000 129,000,000 134,000,000 161,000,000 169,000,000 138,000,000 147,000,000 125,000,000 133,000,000 116,000,000 135,000,000 135,000,000 186,000,000 141,000,000 114,000,000 127,000,000 116,000,000 119,000,000 115,000,000 120,000,000 120,000,000 121,000,000 151,000,000 158,000,000 149,000,000 119,000,000 134,000,000                            
        short-term debt
      431,000,000 431,000,000 500,000,000 400,000,000 399,000,000 499,000,000 548,000,000 224,000,000 291,000,000  140,000,000 347,000,000 664,000,000 799,000,000 1,020,000,000 1,098,000,000 1,018,000,000 480,000,000 221,000,000 435,000,000    1,146,000,000 391,000,000 539,000,000 467,000,000 1,239,000,000 875,000,000 808,000,000 768,000,000 960,000,000 480,000,000 154,000,000 494,000,000                                                       
        total current liabilities
      7,961,000,000 7,705,000,000 7,657,000,000 7,971,000,000 7,902,000,000 7,933,000,000 7,791,000,000 7,393,000,000 9,025,000,000 7,048,000,000 8,511,000,000 8,704,000,000 8,835,000,000 11,335,000,000 10,871,000,000 8,851,000,000 7,872,000,000 5,595,000,000 4,895,000,000 5,556,000,000 4,924,000,000 4,161,000,000 4,249,000,000 5,450,000,000 4,227,000,000 3,692,000,000 4,531,000,000 5,641,000,000 6,570,000,000 5,799,000,000 6,148,000,000 6,036,000,000 5,262,000,000 4,723,000,000 4,987,000,000 4,886,000,000 4,082,000,000 4,054,000,000 4,308,000,000 4,429,000,000 2,944,000,000 2,852,000,000 3,146,000,000 3,440,000,000 2,980,000,000 3,194,000,000 3,424,000,000 3,578,000,000 2,800,000,000 2,707,000,000 2,416,000,000 1,114,000,000 927,000,000 805,000,000 987,000,000 859,000,000 6,030,000,000 4,980,000,000 5,919,000,000 9,795,000,000 8,231,000,000 2,367,000,000 2,334,000,000 2,570,000,000 2,867,000,000 4,371,000,000 4,008,000,000 4,960,000,000 5,061,209,000 1,761,118,000 1,595,803,000 1,414,067,000 411,197,000 524,830,000 622,288,000 541,516,000 460,535,000 349,600,000 341,229,000 358,857,000 325,328,000 248,175,000 252,035,000 275,958,000 208,316,000 240,338,000 246,312,000 259,943,000 237,631,000 
        long-term debt
      8,573,000,000 8,667,000,000 8,678,000,000 8,926,000,000 9,081,000,000 9,359,000,000 9,249,000,000 9,765,000,000 10,163,000,000 9,703,000,000 9,792,000,000 4,762,000,000 4,735,000,000 4,573,000,000 4,696,000,000 4,800,000,000 4,812,000,000 5,447,000,000 5,480,000,000 5,455,000,000 5,541,000,000 3,571,000,000 3,482,000,000 2,962,000,000 2,996,000,000 2,939,000,000 3,022,000,000 2,328,000,000 2,956,000,000 3,072,000,000 3,079,000,000 3,155,000,000 3,727,000,000 3,589,000,000 3,058,000,000                                                       
        deferred tax liabilities
      1,584,000,000 1,564,000,000 1,540,000,000 1,586,000,000 1,594,000,000 1,566,000,000 1,632,000,000 1,655,000,000 1,642,000,000 509,000,000 474,000,000 463,000,000 456,000,000 470,000,000 464,000,000 431,000,000 406,000,000 395,000,000 337,000,000 542,000,000 502,000,000 513,000,000 506,000,000 507,000,000 552,000,000 525,000,000 510,000,000 503,000,000 501,000,000 137,000,000 99,000,000 600,000,000 602,000,000 726,000,000 732,000,000 702,000,000 720,000,000 980,000,000 983,000,000 678,000,000 24,000,000 27,000,000 30,000,000 30,000,000 37,000,000 37,000,000 38,000,000 36,000,000 38,000,000 38,000,000 36,000,000 35,000,000 35,000,000 27,000,000 27,000,000 27,000,000 27,000,000 26,000,000 27,000,000 27,000,000 26,000,000 26,000,000 22,000,000 24,000,000 23,000,000 24,000,000 21,000,000 20,000,000 14,284,000 31,262,000 23,939,000 29,579,000 8,807,000 232,000 131,869,000 69,747,000 94,993,000             
        operating lease liabilities
      462,000,000 454,000,000 453,000,000 393,000,000 388,000,000 399,000,000 409,000,000 413,000,000 417,000,000 412,000,000 427,000,000 442,000,000 452,000,000 456,000,000 470,000,000 478,000,000 386,000,000 398,000,000 397,000,000 406,000,000 389,000,000 397,000,000 403,000,000 310,000,000 331,000,000 327,000,000 343,000,000 357,000,000                                                              
        other non-current liabilities
      241,000,000 234,000,000 237,000,000 216,000,000 230,000,000 222,000,000 221,000,000 222,000,000 220,000,000 199,000,000 206,000,000 225,000,000 226,000,000 223,000,000 244,000,000 241,000,000 234,000,000 207,000,000 203,000,000 197,000,000 187,000,000 175,000,000 162,000,000 171,000,000 179,000,000 170,000,000 175,000,000 180,000,000 137,000,000 154,000,000 177,000,000 168,000,000 162,000,000 142,000,000 146,000,000 144,000,000 144,000,000 140,000,000 161,000,000 160,000,000 142,000,000 143,000,000 147,000,000 154,000,000 159,000,000 137,000,000 148,000,000 147,000,000 153,000,000 182,000,000 192,000,000 192,000,000 196,000,000 192,000,000 198,000,000 182,000,000 179,000,000 177,000,000 187,000,000                               
        total liabilities
      18,821,000,000 18,624,000,000 18,565,000,000 19,092,000,000 19,195,000,000 19,479,000,000 19,302,000,000 19,448,000,000 21,467,000,000 17,871,000,000 19,410,000,000 14,596,000,000 14,704,000,000 17,057,000,000 16,745,000,000 14,801,000,000 13,710,000,000 12,042,000,000 11,312,000,000 12,156,000,000 11,543,000,000 8,817,000,000 8,802,000,000 9,400,000,000 8,285,000,000 7,653,000,000 8,581,000,000 9,009,000,000 10,251,000,000 9,253,000,000 9,599,000,000 10,065,000,000 9,899,000,000 9,337,000,000 9,084,000,000 9,138,000,000 8,720,000,000 9,054,000,000 9,382,000,000 8,020,000,000 6,252,000,000 6,224,000,000 6,388,000,000 6,697,000,000 6,293,000,000 6,574,000,000 6,909,000,000 6,738,000,000 6,393,000,000 6,430,000,000 6,090,000,000 3,985,000,000 3,923,000,000 3,784,000,000 3,957,000,000 3,860,000,000 9,105,000,000 8,161,000,000 9,057,000,000 13,028,000,000 11,478,000,000 5,277,000,000 5,217,000,000 5,572,000,000 5,763,000,000 7,356,000,000 7,147,000,000 8,196,000,000 8,436,430,000 5,460,248,000 4,240,828,000 4,166,331,000 771,114,000 1,219,301,000 2,402,341,000 2,325,469,000 2,259,001,000 2,224,522,000 2,235,898,000 1,824,296,000 1,792,781,000 896,665,000 898,064,000 718,967,000 658,257,000 693,453,000 692,664,000 711,469,000 690,558,000 
        commitments and contingencies
                                                                                               
        equity
                                                                                               
        nasdaq stockholders’ equity:
                                                                                               
        common stock, 0.01 par value...
      6,000,000 6,000,000 6,000,000 6,000,000 6,000,000 6,000,000 6,000,000 6,000,000 6,000,000 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,023,000 2,011,000 2,004,000 2,001,000 1,393,000 1,307,000 1,307,000 1,307,000 1,307,000 1,307,000 1,308,000 1,307,000 1,307,000 1,307,000 1,307,000 1,307,000  1,306,000 1,306,000 1,306,000  
        additional paid-in capital
      5,122,000,000 5,351,000,000 5,425,000,000 5,450,000,000 5,530,000,000 5,477,000,000 5,528,000,000 5,526,000,000 5,496,000,000 1,394,000,000 1,363,000,000 1,312,000,000 1,445,000,000 1,408,000,000 1,385,000,000 1,510,000,000 1,952,000,000 1,983,000,000 2,435,000,000 2,405,000,000 2,547,000,000 2,524,000,000 2,533,000,000 2,527,000,000 2,632,000,000 2,585,000,000 2,713,000,000 2,732,000,000 2,716,000,000 2,676,000,000 2,712,000,000 2,926,000,000 3,024,000,000 3,012,000,000 3,011,000,000 2,963,000,000 3,104,000,000 3,046,000,000 3,062,000,000 3,001,000,000 3,011,000,000 3,032,000,000 3,257,000,000 3,243,000,000 3,222,000,000 4,354,000,000 4,328,000,000 4,302,000,000 4,278,000,000 4,270,000,000 4,261,000,000 3,776,000,000 3,771,000,000 3,804,000,000 3,797,000,000 3,798,000,000 3,793,000,000 3,790,000,000 3,780,000,000 3,784,000,000 3,780,000,000 3,776,000,000 3,774,000,000 3,743,000,000 3,731,000,000 3,723,000,000 3,593,000,000 3,578,000,000 3,518,481,000 3,488,964,000 3,474,450,000 3,465,194,000 1,189,224,000 1,063,836,000 1,056,588,000 1,051,220,000 1,046,599,000 1,040,906,000 1,039,229,000 607,147,000 383,669,000 363,480,000 358,124,000 356,214,000 355,943,000 358,535,000 358,615,000 359,318,000 358,923,000 
        common stock in treasury, at cost: 24,726,296 shares at december 31, 2025 and 23,858,161 shares at december 31, 2024
      -716,000,000                                                                                         
        accumulated other comprehensive loss
      -1,773,000,000 -1,847,000,000 -1,869,000,000 -1,896,000,000 -2,099,000,000 -1,952,000,000 -2,011,000,000 -2,044,000,000 -1,924,000,000 -2,102,000,000 -2,119,000,000 -2,006,000,000 -1,991,000,000 -2,092,000,000 -1,905,000,000 -1,670,000,000 -1,587,000,000 -1,511,000,000 -1,452,000,000 -1,505,000,000 -1,368,000,000 -1,632,000,000 -1,715,000,000 -1,909,000,000 -1,686,000,000 -1,833,000,000 -1,666,000,000 -1,645,000,000 -1,530,000,000 -1,184,000,000 -1,191,000,000 -1,060,000,000 -862,000,000 -825,000,000 -892,000,000 -987,000,000 -979,000,000 -882,000,000 -860,000,000 -770,000,000 -864,000,000 -847,000,000 -805,000,000 -883,000,000 -682,000,000 -325,000,000 -142,000,000 -71,000,000 -67,000,000 -51,000,000 -139,000,000 -218,000,000 -185,000,000 -222,000,000 -368,000,000 -218,000,000 -350,000,000 -346,000,000 -62,000,000 -82,000,000 -272,000,000 -268,000,000 -647,000,000 -438,000,000 -406,000,000 -331,000,000 -600,000,000 -766,000,000           -31,888,000 -1,247,000 -1,290,000 -815,000 -743,000 -1,624,000      
        retained earnings
      9,588,000,000 9,223,000,000 8,955,000,000 8,658,000,000 8,401,000,000 8,184,000,000 8,016,000,000 7,932,000,000 7,825,000,000 7,755,000,000 7,569,000,000 7,411,000,000 7,207,000,000 7,064,000,000 6,869,000,000 6,660,000,000 6,465,000,000 6,296,000,000 6,098,000,000 5,845,000,000 5,628,000,000 5,484,000,000 5,301,000,000 5,140,000,000 5,027,000,000 4,901,000,000 4,829,000,000 4,732,000,000 4,558,000,000 4,399,000,000 4,309,000,000 4,146,000,000 3,970,000,000 3,787,000,000 3,680,000,000 3,595,000,000 3,479,000,000 3,757,000,000 3,679,000,000 3,609,000,000 3,571,000,000 3,464,000,000 3,366,000,000 3,276,000,000 3,292,000,000 3,231,000,000 3,134,000,000 3,032,000,000 2,976,000,000 2,857,000,000 2,765,000,000 2,699,000,000 2,678,000,000 2,614,000,000 2,547,000,000 2,476,000,000 2,391,000,000 2,310,000,000 2,200,000,000 2,108,000,000 2,004,000,000 1,867,000,000 1,766,000,000 1,670,000,000 1,610,000,000 1,567,000,000 1,507,000,000 1,438,000,000 1,350,278,000 1,313,514,000 1,253,398,000 1,151,761,000 1,030,398,000 951,435,000 586,441,000 530,313,000 512,997,000 449,962,000 419,736,000 403,092,000 385,794,000 369,692,000 353,266,000 341,541,000 330,701,000 329,108,000 335,597,000 334,359,000 332,527,000 
        total nasdaq stockholders’ equity
      12,227,000,000 12,023,000,000 11,811,000,000 11,546,000,000 11,191,000,000 11,072,000,000 10,898,000,000 10,809,000,000 10,816,000,000 6,467,000,000 6,235,000,000 6,167,000,000 6,151,000,000 5,875,000,000 5,842,000,000 6,013,000,000 6,395,000,000 6,345,000,000 6,660,000,000 6,332,000,000 6,433,000,000 6,011,000,000 5,754,000,000 5,396,000,000 5,639,000,000 5,327,000,000 5,551,000,000 5,494,000,000 5,449,000,000 5,602,000,000 5,542,000,000 5,725,000,000 5,887,000,000 5,735,000,000 5,576,000,000 5,352,000,000 5,430,000,000                                                     
        noncontrolling interests
      5,000,000 7,000,000 7,000,000 9,000,000 9,000,000 9,000,000 10,000,000 10,000,000 11,000,000 12,000,000 12,000,000 12,000,000 13,000,000 9,000,000 9,000,000 9,000,000 10,000,000 10,000,000 11,000,000 2,000,000 3,000,000 3,000,000 3,000,000 2,000,000                    1,000,000 1,000,000 1,000,000 2,000,000 1,000,000  1,000,000 1,000,000 3,000,000 1,000,000 1,000,000 9,000,000 9,000,000 10,000,000 9,000,000 10,000,000 11,000,000 11,000,000 11,000,000 10,000,000 12,000,000 17,000,000 21,000,000 22,000,000 16,000,000                      
        total equity
      12,232,000,000 12,030,000,000 11,818,000,000 11,555,000,000 11,200,000,000 11,081,000,000 10,908,000,000 10,819,000,000 10,827,000,000 6,479,000,000 6,247,000,000 6,179,000,000 6,164,000,000 5,884,000,000 5,851,000,000 6,022,000,000 6,405,000,000 6,355,000,000 6,671,000,000 6,334,000,000 6,436,000,000 6,014,000,000 5,757,000,000 5,398,000,000                 5,609,000,000 5,546,000,000 5,716,000,000 5,545,000,000 5,794,000,000 6,118,000,000 6,207,000,000 6,240,000,000 6,184,000,000 6,056,000,000 5,863,000,000 5,203,000,000 5,209,000,000 5,136,000,000 4,970,000,000 5,161,000,000 4,986,000,000 4,996,000,000 5,160,000,000 5,037,000,000 4,729,000,000 5,078,000,000 4,693,000,000 4,931,000,000 4,944,000,000 4,971,000,000 4,513,000,000 4,257,000,000                      
        total liabilities and equity
      31,053,000,000 30,654,000,000 30,383,000,000 30,647,000,000 30,395,000,000 30,560,000,000 30,210,000,000 30,267,000,000 32,294,000,000 24,350,000,000 25,657,000,000 20,775,000,000 20,868,000,000 22,941,000,000 22,596,000,000 20,823,000,000 20,115,000,000 18,397,000,000 17,983,000,000 18,490,000,000 17,979,000,000 14,831,000,000 14,559,000,000 14,798,000,000 13,924,000,000 12,980,000,000 14,132,000,000 14,503,000,000 15,700,000,000 14,855,000,000 15,141,000,000 15,790,000,000 15,786,000,000 15,072,000,000 14,660,000,000 14,490,000,000 14,150,000,000 14,808,000,000 15,099,000,000 13,717,000,000 11,861,000,000 11,770,000,000 12,104,000,000 12,242,000,000 12,087,000,000 12,692,000,000 13,116,000,000 12,978,000,000 12,577,000,000 12,486,000,000 11,953,000,000 9,188,000,000 9,132,000,000 8,920,000,000 8,927,000,000 9,021,000,000 14,091,000,000 13,157,000,000 14,217,000,000 18,065,000,000       11,660,000,000 12,453,000,000                      
        common stock in treasury, at cost: 24,655,818 shares at september 30, 2025 and 23,858,161 shares at december 31, 2024
       -710,000,000                                                                                        
        common stock in treasury, at cost: 24,613,881 shares at june 30, 2025 and 23,858,161 shares at december 31, 2024
        -706,000,000                                                                                       
        common stock in treasury, at cost: 24,178,595 shares at march 31, 2025 and 23,858,161 shares at december 31, 2024
         -672,000,000                                                                                      
        common stock in treasury, at cost: 23,858,161 shares at december 31, 2024 and 22,855,184 shares at december 31, 2023
          -647,000,000                                                                                     
        common stock in treasury, at cost: 23,798,693 shares at september 30, 2024 and 22,855,184 shares at december 31, 2023
           -643,000,000                                                                                    
        common stock in treasury, at cost: 23,763,001 shares at june 30, 2024 and 22,855,184 shares at december 31, 2023
            -641,000,000                                                                                   
        common stock in treasury, at cost: 23,293,703 shares at march 31, 2024 and 22,855,184 shares at december 31, 2023
             -611,000,000                                                                                  
        common stock in treasury, at cost: 22,855,184 shares at december 31, 2023 and 21,565,139 shares at december 31, 2022
              -587,000,000                                                                                 
        common stock in treasury, at cost: 22,817,941 shares at september 30, 2023 and 21,565,139 shares at december 31, 2022
               -585,000,000                                                                                
        common stock in treasury, at cost: 22,786,128 shares at june 30, 2023 and 21,565,139 shares at december 31, 2022
                -583,000,000                                                                               
        common stock in treasury, at cost: 22,261,969 shares at march 31, 2023 and 21,565,139 shares at december 31, 2022
                 -555,000,000                                                                              
        common stock in treasury, at cost: 21,565,139 shares at december 31, 2022 and 20,217,912 shares at december 31, 2021
                  -515,000,000                                                                             
        common stock in treasury, at cost: 21,480,515 shares at september 30, 2022 and 20,217,912 shares at december 31, 2021
                   -510,000,000                                                                            
        common stock in treasury, at cost: 7,154,204 shares at june 30, 2022 and 6,739,304 shares at december 31, 2021
                    -509,000,000                                                                           
        common stock in treasury, at cost: 7,046,972 shares at march 31, 2022 and 6,739,304 shares at december 31, 2021
                     -489,000,000                                                                          
        common stock in treasury, at cost: 6,739,304 shares at december 31, 2021 and 6,345,083 shares at december 31, 2020
                      -437,000,000                                                                         
        common stock in treasury, at cost: 6,679,567 shares at september 30, 2021 and 6,345,083 shares at december 31, 2020
                       -425,000,000                                                                        
        common stock in treasury, at cost: 6,669,155 shares at june 30, 2021 and 6,345,083 shares at december 31, 2020
                        -423,000,000                                                                       
        common stock in treasury, at cost: 6,618,279 shares at march 31, 2021 and 6,345,083 shares at december 31, 2020
                         -415,000,000                                                                      
        common stock in treasury, at cost: 6,345,083 shares at december 31, 2020 and 5,980,571 shares at december 31, 2019
                          -376,000,000                                                                     
        common stock in treasury, at cost: 6,277,357 shares at september 30, 2020 and 5,980,571 shares at december 31, 2019
                           -367,000,000                                                                    
        restricted cash
                            30,000,000 29,000,000 30,000,000 29,000,000 30,000,000 67,000,000 41,000,000 52,000,000 34,000,000 24,000,000 22,000,000 21,000,000 18,000,000 78,000,000 15,000,000 19,000,000 22,000,000 21,000,000 56,000,000 18,000,000 17,000,000 19,000,000 49,000,000 27,000,000 39,000,000 84,000,000 84,000,000 81,000,000 82,000,000 83,000,000 85,000,000 81,000,000 36,000,000 38,000,000 43,000,000 51,000,000 59,000,000 60,000,000 60,000,000 53,000,000 31,000,000 44,000,000 60,000,000 155,000,000 152,000,000 139,000,000                      
        common stock in treasury, at cost: 6,273,338 shares at june 30, 2020 and 5,980,571 shares at december 31, 2019
                            -367,000,000                                                                   
        common stock in treasury, at cost: 6,252,080 shares at march 31, 2020 and 5,980,571 shares at december 31, 2019
                             -364,000,000                                                                  
        common stock in treasury, at cost: 5,980,571 shares at december 31, 2019 and 5,544,321 shares at december 31, 2018
                              -336,000,000                                                                 
        financial investments, at fair value
                               201,000,000 259,000,000 220,000,000 268,000,000 202,000,000 313,000,000 224,000,000 235,000,000 207,000,000 300,000,000 220,000,000 245,000,000 238,000,000 255,000,000 259,000,000 201,000,000 193,000,000 264,000,000 194,000,000 174,000,000 169,000,000 203,000,000 197,000,000 162,000,000 190,000,000 170,000,000 218,000,000 223,000,000 157,000,000 196,000,000 215,000,000 279,000,000 294,000,000 320,000,000 283,000,000 253,000,000 343,000,000 310,000,000 261,000,000 308,000,000 257,000,000 236,000,000 224,000,000 227,305,000 194,062,000 136,971,000 121,208,000                  
        common stock in treasury, at cost: 5,908,134 shares at september 30, 2019 and 5,544,321 shares at december 31, 2018
                               -328,000,000                                                                
        common stock in treasury, at cost: 5,898,887 shares at june 30, 2019 and 5,544,321 shares at december 31, 2018
                                -327,000,000                                                               
        common stock in treasury, at cost: 5,891,499 shares at march 31, 2019 and 5,544,321 shares at december 31, 2018
                                 -327,000,000                                                              
        non-current deferred revenue
                                  87,000,000 91,000,000 96,000,000 106,000,000 146,000,000 157,000,000 161,000,000 164,000,000 171,000,000 191,000,000 199,000,000 188,000,000 200,000,000 211,000,000 208,000,000 210,000,000 215,000,000 221,000,000 232,000,000 222,000,000 143,000,000 152,000,000 146,000,000 148,000,000 156,000,000 160,000,000 160,000,000 173,000,000 154,000,000 158,000,000 170,000,000 172,000,000 170,000,000 169,000,000 157,000,000 159,000,000 160,000,000 159,000,000 163,000,000 157,000,000 109,291,000 125,224,000 130,934,000 136,835,000 94,045,000 93,776,000 96,120,000 96,570,000 90,644,000 96,454,000 98,618,000 93,482,000 92,019,000 94,289,000 94,157,000 89,758,000 89,821,000 90,804,000 88,254,000 84,927,000 84,703,000 
        common stock in treasury, at cost: 5,544,321 shares at december 31, 2018 and 4,932,402 shares at december 31, 2017
                                  -297,000,000                                                             
        assets held for sale
                                     268,000,000 297,000,000 300,000,000                                                        
        liabilities held for sale
                                     27,000,000 45,000,000 49,000,000                                                        
        common stock in treasury, at cost: 5,474,758 shares at september 30, 2018 and 4,932,402 shares at december 31, 2017
                                   -291,000,000                                                            
        common stock in treasury, at cost: 5,464,771 shares at june 30, 2018 and 4,932,402 shares at december 31, 2017
                                    -290,000,000                                                           
        deferred tax assets
                                     416,000,000 391,000,000 611,000,000 633,000,000 617,000,000 717,000,000 768,000,000 741,000,000 604,000,000 24,000,000 49,000,000 35,000,000 23,000,000 16,000,000 30,000,000 22,000,000 17,000,000 12,000,000 54,000,000 51,000,000 46,000,000 33,000,000 16,000,000 16,000,000 14,000,000 16,000,000 20,000,000 24,000,000 8,000,000 13,000,000 17,000,000 24,000,000 22,000,000 25,000,000 43,000,000 42,000,000 33,000,000 41,300,000 36,595,000 18,066,000 15,987,000 10,794,000 104,729,000 18,039,000 18,086,000 11,098,000 11,450,000 14,324,000 13,330,000 9,953,000         
        common stock in treasury, at cost: 5,452,116 shares at march 31, 2018 and 4,932,402 shares at december 31, 2017
                                     -289,000,000                                                          
        common stock in treasury, at cost: 4,932,402 shares at december 31, 2017 and 3,921,718 shares at december 31, 2016
                                      -247,000,000                                                         
        common stock in treasury, at cost: 4,859,485 shares at september 30, 2017 and 3,921,718 shares at december 31, 2016
                                       -241,000,000                                                        
        common stock in treasury, at cost: 4,634,412 shares at june 30, 2017 and 3,921,718 shares at december 31, 2016
                                        -225,000,000                                                       
        current portion of debt obligations
                                         379,000,000  20,000,000    20,000,000      430,000,000 45,000,000 45,000,000 138,000,000 137,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 140,000,000 140,000,000 140,000,000 140,000,000 140,000,000 105,000,000 225,000,000 169,000,000 225,000,000 225,000,000 225,000,000 206,250,000 98,438,000 68,906,000   10,681,000 10,681,000 10,681,000 11,693,000 11,848,000 7,500,000 7,500,000         
        debt obligations
                                         3,242,000,000 3,603,000,000 3,689,000,000 3,731,000,000 2,565,000,000 2,364,000,000 2,415,000,000 2,281,000,000 2,306,000,000 2,313,000,000 2,345,000,000 2,408,000,000 2,084,000,000 2,589,000,000 2,673,000,000 2,647,000,000 1,829,000,000 1,931,000,000 1,941,000,000 1,951,000,000 1,962,000,000 2,072,000,000 2,168,000,000 2,069,000,000 2,150,000,000 2,181,000,000 1,846,000,000 1,912,000,000 1,986,000,000 1,867,000,000 1,920,000,000 2,090,000,000 2,229,000,000 2,293,756,000 2,349,919,000 1,545,145,000 1,574,590,000 118,438,000 443,088,000 1,487,795,000 1,490,371,000 1,492,947,000 1,594,510,000 1,612,565,000 1,183,147,000 1,184,928,000         
        common stock in treasury, at cost: 4,591,558, shares at march 31, 2017 and 3,921,718 shares at december 31, 2016
                                         -221,000,000                                                      
        common stock in treasury, at cost: 3,921,718 shares at december 31, 2016 and 2,917,464 shares at december 31, 2015
                                          -176,000,000                                                     
        nasdaq stockholders' equity:
                                                                                               
        common stock in treasury, at cost: 3,820,143 shares at september 30, 2016 and 2,917,464 shares at december 31, 2015
                                           -169,000,000                                                    
        total nasdaq stockholders' equity
                                           5,754,000,000 5,717,000,000 5,697,000,000 5,609,000,000 5,546,000,000 5,716,000,000 5,544,000,000 5,793,000,000 6,117,000,000                                            
        common stock in treasury, at cost: 3,797,504 shares at june 30, 2016 and 2,917,464 shares at december 31, 2015
                                            -166,000,000                                                   
        common stock in treasury, at cost: 3,452,373 shares at march 31, 2016 and 2,917,464 shares at december 31, 2015
                                             -145,000,000                                                  
        non-current deferred tax assets
                                              619,000,000 630,000,000 621,000,000 652,000,000 536,000,000 585,000,000 482,000,000 415,000,000 404,000,000 399,000,000 478,000,000 291,000,000 294,000,000 303,000,000 392,000,000 326,000,000 392,000,000 385,000,000 273,000,000 358,000,000 433,000,000 403,000,000 640,000,000 523,000,000 504,000,000 403,000,000 615,000,000 720,000,000 644,112,000 191,912,000 163,521,000 156,948,000 63,279,000 58,049,000 100,844,000 100,263,000 96,986,000 126,149,000 124,267,000 127,845,000 133,336,000         
        non-current deferred tax liabilities
                                              602,000,000 603,000,000 606,000,000 587,000,000 626,000,000 677,000,000 697,000,000 707,000,000 708,000,000 716,000,000 689,000,000 702,000,000 713,000,000 686,000,000 661,000,000 684,000,000 670,000,000 678,000,000 712,000,000 716,000,000 698,000,000 713,000,000 644,000,000 676,000,000 683,000,000 726,000,000 688,000,000 675,000,000 671,933,000 1,020,486,000 864,698,000 925,832,000 91,811,000 91,059,000 95,342,000 96,507,000 115,791,000 88,328,000 89,221,000 93,028,000 95,151,000         
        common stock in treasury, at cost: 2,917,464 shares at december 31, 2015 and 1,530,041 shares at december 31, 2014
                                              -111,000,000                                                 
        common stock in treasury, at cost: 2,816,061 shares at september 30, 2015 and 1,530,041 shares at december 31, 2014
                                               -105,000,000                                                
        common stock in treasury, at cost: 2,800,570 shares at june 30, 2015 and 1,530,041 shares at december 31, 2014
                                                -104,000,000                                               
        common stock in treasury, at cost: 2,599,509 shares at march 31, 2015 and 1,530,041 shares at december 31, 2014
                                                 -94,000,000                                              
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: none at december 31, 2014 and 1,600,000 at december 31, 2013; shares outstanding: none at december 31, 2014 and december 31, 2013
                                                                                               
        common stock in treasury, at cost: 1,530,041 shares at december 31, 2014 and 45,062,071 shares at december 31, 2013
                                                  -41,000,000                                             
        sections 31 fees payable to sec
                                                   26,000,000 154,000,000 74,000,000 82,000,000 19,000,000 145,000,000 71,000,000                                      
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: none at september 30, 2014 and 1,600,000 at december 31, 2013; shares outstanding: none at september 30, 2014 and december 31, 2013
                                                                                               
        common stock in treasury, at cost: 48,731,243 shares at september 30, 2014 and 45,062,071 shares at december 31, 2013
                                                   -1,145,000,000                                            
        nasdaq omx stockholders' equity:
                                                                                               
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: none at june 30, 2014 and 1,600,000 at december 31, 2013; shares outstanding: none at june 30, 2014 and december 31, 2013
                                                                                               
        common stock in treasury, at cost: 48,052,711 shares at june 30, 2014 and 45,062,071 shares at december 31, 2013
                                                    -1,117,000,000                                           
        total nasdaq omx stockholders' equity
                                                    6,205,000,000 6,239,000,000 6,184,000,000 6,055,000,000 5,862,000,000 5,200,000,000                                      
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: none at march 31, 2014 and 1,600,000 at december 31, 2013; shares outstanding: none at march 31, 2014 and december 31, 2013
                                                                                               
        common stock in treasury, at cost: 45,613,102 shares at march 31, 2014 and 45,062,071 shares at december 31, 2013
                                                     -1,026,000,000                                          
        non-current restricted cash
                                                        25,000,000 25,000,000 25,000,000 25,000,000 105,000,000 103,000,000 105,000,000 105,000,000 105,000,000 105,000,000 105,000,000 106,000,000 105,000,000 105,000,000 50,000,000 50,000,000 50,000,000 50,000,000                      
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at december 31, 2013 and december 31, 2012; shares outstanding: none at december 31, 2013 and december 31, 2012
                                                                                               
        common stock in treasury, at cost: 45,062,071 shares at december 31, 2013 and 47,821,070 shares at december 31, 2012
                                                      -1,005,000,000                                         
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at september 30, 2013 and december 31, 2012; shares outstanding: none at september 30, 2013 and december 31, 2012
                                                                                               
        common stock in treasury, at cost: 46,021,709 shares at september 30, 2013 and 47,821,070 shares at december 31, 2012
                                                       -1,023,000,000                                        
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at june 30, 2013 and december 31, 2012; shares outstanding: none at june 30, 2013 and december 31, 2012
                                                                                               
        common stock in treasury, at cost: 46,205,474 shares at june 30, 2013 and 47,821,070 shares at december 31, 2012
                                                        -1,027,000,000                                       
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at march 31, 2013 and december 31, 2012; shares outstanding: none at march 31, 2013 and december 31, 2012
                                                                                               
        common stock in treasury, at cost: 47,665,311 shares at march 31, 2013 and 47,821,070 shares at december 31, 2012
                                                         -1,059,000,000                                      
        open clearing contracts:
                                                                                               
        derivative positions, at fair value
                                                              1,566,000,000 1,423,000,000 1,417,000,000 2,295,000,000 4,037,000,000                             
        resale agreements, at contract value
                                                              3,745,000,000 2,873,000,000 3,560,000,000 6,655,000,000 3,441,000,000                             
        repurchase agreements, at contract value
                                                              3,745,000,000 2,873,000,000 3,560,000,000 6,655,000,000 3,441,000,000                             
        nasdaq omx stockholders’ equity:
                                                                                               
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at december 31, 2012 and december 31, 2011; shares outstanding: none at december 31, 2012 and december 31, 2011
                                                                                               
        common stock in treasury, at cost: 47,821,070 shares at december 31, 2012 and 39,845,172 shares at december 31, 2011
                                                          -1,058,000,000                                     
        total nasdaq omx stockholders’ equity
                                                          5,208,000,000 5,135,000,000 4,961,000,000 5,152,000,000 4,976,000,000 4,987,000,000 5,150,000,000 5,026,000,000 4,718,000,000 5,067,000,000 4,683,000,000 4,919,000,000 4,927,000,000 4,950,000,000 4,491,000,000 4,241,000,000                      
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at september 30, 2012 and december 31, 2011; shares outstanding: none at september 30, 2012 and december 31, 2011
                                                                                               
        common stock in treasury, at cost: 48,228,002 shares at september 30, 2012 and 39,845,172 shares at december 31, 2011
                                                           -1,063,000,000                                    
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at june 30, 2012 and december 31, 2011; shares outstanding: none at june 30, 2012 and december 31, 2011
                                                                                               
        common stock in treasury, at cost: 46,247,034 shares at june 30, 2012 and 39,845,172 shares at december 31, 2011
                                                            -1,017,000,000                                   
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at march 31, 2012 and december 31, 2011; shares outstanding: none at march 31, 2012 and december 31, 2011
                                                                                               
        common stock in treasury, at cost: 41,536,198 shares at march 31, 2012 and 39,845,172 shares at december 31, 2011
                                                             -906,000,000                                  
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at december 31, 2011 and december 31, 2010; shares outstanding: none at december 31, 2011 and december 31, 2010
                                                                                               
        common stock in treasury, at cost: 39,845,172 shares at december 31, 2011 and 37,587,403 shares at december 31, 2010
                                                              -860,000,000                                 
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at september 30, 2011 and december 31, 2010; shares outstanding: none at september 30, 2011 and december 31, 2010
                                                                                               
        common stock in treasury, at cost: 36,245,581 shares at september 30, 2011 and 37,587,403 shares at december 31, 2010
                                                               -769,000,000                                
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at june 30, 2011 and december 31, 2010; shares outstanding: none at june 30, 2011 and december 31, 2010
                                                                                               
        common stock in treasury, at cost: 36,315,600 shares at june 30, 2011 and 37,587,403 shares at december 31, 2010
                                                                -770,000,000                               
        other assets
                                                                 149,000,000 149,000,000 85,000,000 84,000,000 132,000,000 119,000,000 215,000,000 216,000,000 299,000,000 357,082,000 424,006,000 367,581,000 376,695,000 7,230,000 6,778,000 12,395,000 12,633,000 13,286,000 14,613,000 12,446,000 16,714,000 16,540,000 1,659,000 1,070,000 1,023,000 1,838,000 1,423,000 1,491,000 1,507,000 1,238,000 
        other liabilities
                                                                 195,000,000 198,000,000 182,000,000 170,000,000 181,000,000 186,000,000 180,000,000 198,000,000 175,000,000 300,241,000 203,501,000 104,248,000 115,007,000 55,623,000 66,548,000 100,796,000 100,505,000 99,084,000 71,032,000 69,624,000 70,439,000 69,514,000 33,524,000 34,485,000 35,625,000 39,935,000 37,810,000 30,049,000 33,227,000 35,476,000 
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at march 31, 2011 and december 31, 2010; shares outstanding: none at march 31, 2011 and december 31, 2010
                                                                                               
        common stock in treasury, at cost: 37,076,791 shares at march 31, 2011 and 37,587,403 shares at december 31, 2010
                                                                 -786,000,000                              
        series a convertible preferred stock
                                                                     16,000,000 15,000,000 15,000,000                        
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at december 31, 2010 and december 31, 2009; shares outstanding: none at december 31, 2010 and 1,600,000 at december 31, 2009
                                                                                               
        common stock in treasury, at cost: 37,587,403 shares at december 31, 2010 and 327,722 shares at december 31, 2009
                                                                  -796,000,000                             
        total liabilities, series a convertible preferred stock and equity
                                                                  16,207,000,000 10,355,000,000 9,910,000,000 10,519,000,000 10,722,000,000 12,342,000,000                        
        market value, outstanding derivative positions
                                                                   1,657,000,000 1,511,000,000 1,846,000,000 2,054,000,000 3,569,000,000 3,034,000,000 4,048,000,000 4,121,797,000 761,740,000 716,632,000 476,954,000                  
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at september 30, 2010 and december 31, 2009; shares outstanding: none at september 30, 2010 and 1,600,000 at december 31, 2009
                                                                                               
        common stock in treasury, at cost: 15,167,044 shares at september 30, 2010 and 327,722 shares at december 31, 2009
                                                                   -310,000,000                            
        other accrued liabilities
                                                                    90,000,000 105,000,000 79,000,000 90,000,000 110,000,000 129,000,000 165,267,000 202,877,000 169,011,000 155,855,000 24,398,000 75,658,000 60,367,000 73,290,000 72,096,000 80,415,000 56,456,000 56,705,000 61,849,000 49,252,000 43,579,000 49,829,000 42,467,000 64,299,000 75,888,000 66,276,000 75,951,000 
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued: 1,600,000 at june 30, 2010 and december 31, 2009; shares outstanding: none at june 30, 2010 and 1,600,000 at december 31, 2009
                                                                                               
        common stock in treasury, at cost: 10,291,952 shares at june 30, 2010 and 327,722 shares at december 31, 2009
                                                                    -212,000,000                           
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued and outstanding: 1,600,000 at march 31, 2010 and december 31, 2009
                                                                                               
        common stock in treasury, at cost: 2,637,797 shares at march 31, 2010 and 327,722 shares at december 31, 2009
                                                                     -58,000,000                          
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued and outstanding: 1,600,000 at december 31, 2009 (classified above as temporary equity) and none at december 31, 2008
                                                                                               
        common stock in treasury, at cost: 327,722 shares at december 31, 2009 and 291,444 shares at december 31, 2008
                                                                      -10,000,000                         
        preferred stock, 30,000,000 shares authorized, series a convertible preferred stock: shares issued and outstanding: 1,600,000 at september 30, 2009 (classified above as temporary equity) and none at december 31, 2008
                                                                                               
        common stock in treasury, at cost: 317,155 shares at september 30, 2009 and 291,444 shares at december 31, 2008
                                                                       -11,000,000                        
        liabilities and equity
                                                                                               
        preferred stock, 30,000,000 shares authorized, none issued or outstanding
                                                                                               
        common stock in treasury, at cost: 311,761 shares at june 30, 2009 and 291,444 shares at december 31, 2008
                                                                        -11,000,000                       
        common stock in treasury, at cost: 302,545 shares at march 31, 2009 and 291,444 shares at december 31, 2008
                                                                         -11,000,000                      
        liabilities and stockholders’ equity
                                                                                               
        minority interests
                                                                          17,023,000 3,758,000 12,896,000 12,391,000                  
        stockholders’ equity
                                                                                               
        common stock in treasury, at cost: 291,444 shares at december 31, 2008 and 227,612 shares at december 31, 2007
                                                                          -10,350,000                     
        accumulated other comprehensive income
                                                                          -619,010,000 -36,702,000 -4,695,000 2,888,000 -4,697,000 -10,692,000 190,507,000 95,602,000 136,204,000 71,168,000       -1,056,000 -593,000 -1,645,000 -118,000 86,000 
        total stockholders’ equity
                                                                          4,241,422,000 4,754,640,000 4,715,261,000 4,612,585,000 2,208,283,000 1,780,717,000 1,602,972,000 1,441,774,000 1,457,355,000 1,317,462,000 1,178,791,000 521,389,000 253,007,000 205,191,000 163,716,000 168,522,000 156,563,000 157,082,000 162,421,000 162,002,000 160,696,000 
        total liabilities, minority interests and stockholders’ equity
                                                                          12,694,875,000 10,218,646,000 8,968,985,000 8,791,307,000                 851,254,000 
        common stock in treasury, at cost: 272,786 shares at september 30, 2008 and 227,612 shares at december 31, 2007
                                                                           -13,147,000                    
        common stock in treasury, at cost: 272,377 shares at june 30, 2008 and 227,612 shares at december 31, 2007
                                                                            -9,896,000                   
        income tax payable
                                                                             110,293,000 34,142,000 160,789,000                
        common stock in treasury, at cost: 255,780 shares at march 31, 2008 and 227,612 shares at december 31, 2007
                                                                             -9,259,000                  
        available-for-sale investments, at fair value
                                                                               9,201,000 1,694,984,000 1,531,778,000 1,628,209,000 1,419,826,000 1,215,525,000 221,275,000          
        minority interest
                                                                                  96,000 411,000 545,000 862,000 998,000 1,156,000        
        common stock in treasury, at cost: 227,612 shares at december 31, 2007 and 18,390,886 shares at december 31, 2006
                                                                              -8,035,000                 
        total liabilities, minority interest and stockholders’ equity
                                                                              2,979,397,000 3,000,018,000 4,005,313,000 3,767,243,000 3,716,452,000 3,542,395,000 3,415,234,000 2,346,547,000 2,046,786,000         
        common stock in treasury, at cost: 17,210,234 shares at september 30, 2007 and 18,390,886 shares at december 31, 2006
                                                                               -225,169,000                
        common stock in treasury, at cost: 17,791,749 shares at june 30, 2007 and 18,390,886 shares at december 31, 2006
                                                                                -231,871,000               
        common stock in treasury, at cost: 18,146,808 shares at march 31, 2007 and 18,390,886 shares at december 31, 2006
                                                                                 -236,668,000              
        payables to related parties
                                                                                   10,139,000 9,798,000 9,257,000 28,218,000 20,531,000 18,532,000 20,606,000 16,749,000 8,805,000 8,181,000 9,433,000 21,558,000 
        preferred stock, 30,000,000 shares authorized, series d preferred stock: 1.00 par value, 1 share issued and outstanding at december 31, 2005, series c cumulative preferred stock: 953,470 shares issued and outstanding at december 31, 2005
                                                                                               
        common stock in treasury, at cost: 18,390,886 shares at december 31, 2006 and 47,535,874 shares at december 31, 2005
                                                                                  -239,752,000             
        deferred stock compensation
                                                                                      -4,930,000 -2,752,000 -3,289,000 -1,835,000 -1,030,000 -1,292,000 -1,571,000 -895,000  
        common stock issuable
                                                                                      6,809,000 4,613,000 4,616,000 3,264,000 2,567,000 2,721,000 2,821,000 2,042,000 2,881,000 
        accounts receivable
                                                                                   228,387,000 234,395,000           
        accrued pension costs
                                                                                   24,598,000 24,641,000 25,343,000 25,841,000 25,015,000 29,030,000 27,383,000 25,671,000 24,185,000 22,142,000 27,826,000 26,831,000 
        preferred stock, 30,000,000 shares authorized, series d preferred stock: 1.00 par value, 1 share issued and outstanding at september 30, 2006 and december 31, 2005; series c cumulative preferred stock: 953,470 shares issued and outstanding at december 31, 2005
                                                                                               
        common stock in treasury, at cost: 18,878,373 shares at september 30, 2006 and 47,535,874 shares at december 31, 2005
                                                                                   -245,881,000            
        receivables from related parties
                                                                                    90,000 49,000 18,000 19,000 19,000 19,000 3,229,000 233,000 28,000 49,000 7,731,000 
        property and equipment:
                                                                                               
        land, buildings and improvements
                                                                                    31,649,000 60,916,000 60,920,000 60,827,000 79,631,000 96,953,000 97,322,000 96,708,000 96,760,000 96,586,000 96,578,000 
        data processing equipment and software
                                                                                    180,583,000 178,730,000 179,991,000 184,475,000 211,577,000 214,473,000 205,279,000 313,359,000 347,937,000 351,649,000 346,928,000 
        furniture, equipment and leasehold improvements
                                                                                    104,977,000 115,290,000 115,551,000 119,176,000 125,793,000 127,427,000 140,026,000 157,162,000 161,716,000 166,414,000 168,478,000 
        property and equipment: - sum
                                                                                    317,209,000 354,936,000 356,462,000 364,478,000 417,001,000 438,853,000 442,627,000 567,229,000 606,413,000 614,649,000 611,984,000 
        less accumulated depreciation and amortization
                                                                                    -222,904,000 -247,173,000 -233,886,000 -238,097,000 -282,325,000 -276,743,000 -268,787,000     
        total property and equipment
                                                                                    94,305,000 107,763,000 122,576,000 126,381,000 134,676,000 162,110,000 173,840,000 205,335,000 214,626,000 228,007,000 242,943,000 
        preferred stock, 30,000,000 shares authorized, series d preferred stock: 1.00 par value, 1 share issued and outstanding at june 30, 2006 and december 31, 2005; series c cumulative preferred stock: 953,470 shares issued and outstanding at december 31, 2005
                                                                                               
        common stock in treasury, at cost: 19,088,393 shares at june 30, 2006 and 47,535,874 shares at december 31, 2005
                                                                                    -249,594,000           
        preferred stock, 30,000,000 shares authorized, series d preferred stock: 1 share issued and outstanding at march 31, 2006 and december 31, 2005; series c cumulative preferred stock: 953,470 shares issued and outstanding at december 31, 2005
                                                                                               
        common stock in treasury, at cost: 37,837,924 shares at march 31, 2006 and 47,535,874 shares at december 31, 2005
                                                                                     -488,910,000          
        investments:
                                                                                               
        available-for-sale, at fair value
                                                                                      179,369,000 225,887,000 215,460,000 231,049,000 174,913,000 188,982,000 192,327,000 242,302,000 185,704,000 
        held-to-maturity, at amortized cost
                                                                                       30,595,000 30,594,000 30,607,000 28,600,000 25,600,000 8,599,000 21,042,000 23,765,000 
        held-to-maturity investments, at amortized cost
                                                                                               
        preferred stock, 30,000,000 shares authorized, series c cumulative preferred stock: shares issued and outstanding: 953,470 at december 31, 2005 and 1,338,402 at december 31, 2004; series d (at december 31, 2005) and series b (at december 31, 2004): 1 share issued and outstanding
                                                                                      95,017,000         
        common stock in treasury, at cost: 47,535,874 shares at december 31, 2005 and 51,680,106 shares at december 31, 2004
                                                                                      -613,369,000         
        deferred tax asset
                                                                                       11,266,000 7,468,000 22,739,000 24,209,000 29,633,000 37,202,000 38,831,000 40,460,000 
        non-current deferred tax asset
                                                                                       57,155,000 58,188,000 46,254,000 48,765,000 55,788,000 69,944,000 72,426,000 72,079,000 
        senior notes
                                                                                       25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 25,000,000 
        convertible notes
                                                                                       442,333,000 442,239,000       
        non-current deferred tax liability
                                                                                       28,329,000 21,118,000 25,243,000 29,514,000 35,316,000 40,907,000 40,546,000 40,917,000 
        mezzanine equity
                                                                                               
        warrants underlying common stock, 4,962,500 warrants outstanding at september 30, 2005
                                                                                       10,226,000        
        preferred stock, 30,000,000 shares authorized, series c cumulative preferred stock: shares issued and outstanding: 953,470 at september 30, 2005 and 1,338,402 at december 31, 2004; series b preferred stock: 1 share issued and outstanding at september 30, 2005 and december 31, 2004
                                                                                       94,687,000        
        common stock in treasury, at cost: 48,793,952 shares at september 30, 2005 and 51,680,106 shares at december 31, 2004
                                                                                       -625,021,000        
        total liabilities, minority interest, mezzanine and stockholders’ equity
                                                                                       1,113,238,000        
        warrants underlying common stock, 4,962,500 warrants outstanding at june 30, 2005
                                                                                        10,226,000       
        preferred stock, 30,000,000 shares authorized, series c cumulative preferred stock: shares issued and outstanding: 953,470 at june 30, 2005 and 1,338,402 at december 31, 2004; series b preferred stock: 1 share issued and outstanding at june 30, 2005 and december 31, 2004
                                                                                        94,027,000       
        common stock in treasury, at cost: 50,243,653 shares at june 30, 2005 and 51,680,106 shares at december 31, 2004
                                                                                        -643,592,000       
        total liabilities, mezzanine and stockholders’ equity
                                                                                        1,072,006,000       
        subordinated notes
                                                                                         240,000,000 240,000,000 240,000,000 240,000,000 240,000,000 240,000,000 
        preferred stock, 30,000,000 shares authorized, series c: 1,338,402 shares issued and outstanding; series b: 1 share issued and outstanding
                                                                                         131,060,000      
        common stock in treasury, at cost: 51,634,197 shares at march 31, 2005 and 51,680,106 shares at december 31, 2004
                                                                                         -661,405,000      
        total liabilities and stockholders’ equity
                                                                                         887,489,000 814,820,000 850,535,000 855,085,000 873,471,000  
        current obligation under capital lease
                                                                                              1,607,000 
        common stock, .01 par value...
                                                                                          1,306,000    1,306,000 
        preferred stock, 30,000,000 shares authorized, series c: 1,338,402 shares issued and outstanding in 2004; series a: 1,338,402 shares issued and outstanding in 2003; series b: 1 share issued and outstanding in 2004 and 2003
                                                                                          130,134,000     
        common stock in treasury, at cost: 51,680,106 shares in 2004 and 52,127,302 shares in 2003
                                                                                          -662,002,000     
        less: accumulated depreciation and amortization
                                                                                           -361,894,000 -391,787,000 -386,642,000  
        preferred stock, 30,000,000 authorized, series a: 1,338,402 shares issued and outstanding; series b: 1 share issued and outstanding
                                                                                           133,840,000 133,840,000 133,840,000 133,840,000 
        common stock in treasury, at cost: 52,034,598 shares at september 30, 2004 and 52,127,302 shares at december 31, 2003
                                                                                           -666,543,000    
        other intangible assets
                                                                                            812,000 841,000 871,000 
        common stock in treasury, at cost: 52,034,504 at june 30, 2004 and 52,127,302 shares at december 31, 2003
                                                                                            -666,542,000   
        common stock in treasury, at cost: 52,136,516 at march 31, 2004 and 52,127,302 shares at december 31, 2003
                                                                                             -667,850,000  
        current assets of discontinued operations
                                                                                               
        non-current assets of discontinued operations
                                                                                               
        current liabilities of discontinued operations
                                                                                               
        non-current obligation under capital lease
                                                                                               
        non-current liabilities of discontinued operations
                                                                                               
        minority interests of discontinued operations
                                                                                               
        common stock in treasury, at cost: 52,127,302 shares in 2003 and 52,252,213 shares in 2002
                                                                                               
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 
                                                                                              
          cash flows from operating activities:
                                                                                              
          net income
        518,000,000 423,000,000 451,000,000 395,000,000 355,000,000 305,000,000 222,000,000 233,000,000 196,000,000 294,000,000 266,000,000 301,000,000 240,000,000 294,000,000 306,000,000 283,000,000 259,000,000 289,000,000 341,000,000 298,000,000 225,000,000 264,000,000 241,000,000 203,000,000 203,000,000 150,000,000 174,000,000 247,000,000 -44,000,000 163,000,000 162,000,000 177,000,000 246,000,000 171,000,000 148,000,000 169,000,000 -225,000,000 131,000,000 70,000,000 132,000,000 148,000,000 138,000,000 132,000,000 9,000,000 86,000,000 103,000,000  113,000,000 88,000,000 42,000,000 85,000,000 88,000,000 92,000,000 84,000,000 81,000,000 108,000,000 91,000,000 103,000,000 135,000,000 100,000,000 94,000,000 60,000,000 42,000,000 59,000,000 68,000,000 94,000,000 36,764,000 60,116,000 101,637,000 121,363,000 78,963,000 364,993,000 56,129,000 18,316,000 63,035,000 30,226,000 16,644,000 17,988,000 17,146,000 17,802,000 13,971,000 12,771,000 7,431,000 -5,485,000 4,785,000 4,631,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                              
          depreciation and amortization
        161,000,000 158,000,000 157,000,000 156,000,000 153,000,000 152,000,000 153,000,000 155,000,000 125,000,000 64,000,000 65,000,000 69,000,000 63,000,000 63,000,000 65,000,000 67,000,000 81,000,000 66,000,000 68,000,000 63,000,000 53,000,000 51,000,000 50,000,000 48,000,000 47,000,000 47,000,000 48,000,000 48,000,000 51,000,000 53,000,000 53,000,000 53,000,000 48,000,000 48,000,000 47,000,000 45,000,000 45,000,000 46,000,000 41,000,000 38,000,000 36,000,000 35,000,000 33,000,000 34,000,000 33,000,000 35,000,000  33,000,000 28,000,000 27,000,000 27,000,000 26,000,000 25,000,000 26,000,000 28,000,000 28,000,000 26,000,000 27,000,000 28,000,000 25,000,000 25,000,000 25,000,000 26,000,000 28,000,000 26,000,000 24,000,000 26,849,000 27,624,000 22,193,000 15,912,000 9,594,000 9,661,000 9,796,000 9,839,000 10,584,000   24,549,000 20,221,000 13,639,000 14,933,000 18,193,000 21,339,000 18,871,000 16,510,000 19,616,000 
          share-based compensation
        43,000,000 41,000,000 46,000,000 35,000,000 36,000,000 36,000,000 39,000,000 30,000,000 32,000,000 30,000,000 34,000,000 26,000,000 30,000,000 27,000,000 24,000,000 25,000,000 24,000,000 23,000,000 24,000,000 19,000,000 23,000,000 24,000,000 23,000,000 17,000,000 22,000,000 21,000,000 20,000,000 16,000,000 18,000,000 18,000,000 18,000,000 15,000,000 18,000,000 18,000,000 19,000,000 15,000,000 31,000,000 20,000,000 19,000,000 16,000,000 19,000,000 17,000,000 18,000,000 14,000,000 17,000,000 14,000,000  14,000,000 9,000,000 9,000,000 12,000,000 12,000,000 12,000,000 10,000,000 10,000,000 9,000,000 10,000,000 7,000,000 8,000,000 8,000,000 9,000,000 8,000,000 10,000,000 8,000,000 9,000,000 8,000,000 7,210,000 6,983,000 6,041,000 5,447,000 4,866,000 4,316,000 4,088,000 3,476,000 2,350,000            
          deferred income tax expense
                                                                                              
          extinguishment of debt and bridge fees
                                                                                            
          net gain on divestitures
        -49,000,000 2,000,000                                                                                     
          non-cash restructuring charges
            4,000,000 5,000,000   12,000,000         4,000,000               5,000,000 3,000,000 2,000,000 6,000,000 128,000,000    1,000,000 1,000,000 3,000,000 8,000,000 4,000,000                                 
          net loss from unconsolidated investees
            -9,000,000                                                                                  
          operating lease asset impairments
                                                                                            
          adenza purchase accounting adjustment
                                                                                             
          other reconciling items included in net income
        22,000,000 8,000,000 2,000,000 -11,000,000 -4,000,000 23,000,000 -11,000,000 27,000,000 8,000,000 1,000,000 5,000,000 16,000,000 21,000,000 3,000,000 -5,000,000 9,000,000 -3,000,000 -1,000,000 7,000,000 3,000,000 2,000,000 3,000,000 14,000,000 -1,000,000 1,000,000 3,000,000   5,000,000 1,000,000 6,000,000 3,000,000 7,000,000 -3,000,000 14,000,000 7,000,000 4,000,000 1,000,000 3,000,000 1,000,000 -2,000,000 6,000,000 3,000,000 10,000,000                                          
          net change in operating assets and liabilities, excluding the effects of divestitures:
                                                                                              
          receivables
        -81,000,000 27,000,000 97,000,000 48,000,000 -94,000,000 -43,000,000 -39,000,000 -17,000,000 -72,000,000 3,000,000 62,000,000 10,000,000 -32,000,000 6,000,000 -36,000,000 -39,000,000 -38,000,000 8,000,000 18,000,000 6,000,000 -58,000,000 18,000,000 47,000,000 -174,000,000 -35,000,000 13,000,000 30,000,000 -50,000,000 -24,000,000 41,000,000 75,000,000 -127,000,000 -81,000,000 72,000,000 72,000,000 -38,000,000 -77,000,000    -41,000,000 42,000,000 18,000,000 36,000,000 -23,000,000 -42,000,000  -14,000,000 -36,000,000 14,000,000 -4,000,000 9,000,000 -15,000,000 -20,000,000 33,000,000 -1,000,000 -17,000,000 -26,000,000 13,000,000 63,000,000 9,000,000 -80,000,000 73,000,000 9,000,000 -25,000,000 -24,000,000 13,431,000 513,000 49,796,000 -32,187,000 31,872,000 -9,568,000 18,564,000 -67,370,000    -27,332,000 -2,433,000 -14,821,000 -1,298,000 -1,531,000 -9,807,000 -497,000   
          other assets
        -163,000,000 -17,000,000 18,000,000 66,000,000 -7,000,000 -45,000,000 7,000,000 -5,000,000 -16,000,000 15,000,000 3,000,000 7,000,000 57,000,000 16,000,000 11,000,000 14,000,000 2,000,000 -55,000,000 7,000,000 -94,000,000 -17,000,000 33,000,000 -59,000,000 69,000,000 -45,000,000 58,000,000 102,000,000 -288,000,000 -17,000,000 -63,000,000 1,000,000 39,000,000 -50,000,000 289,000,000 18,000,000 4,000,000 -53,000,000 24,000,000 -23,000,000 34,000,000   -4,000,000 17,000,000 -35,000,000 -17,000,000  64,000,000   9,000,000 80,000,000 5,000,000 -23,000,000 9,000,000 -5,000,000 74,000,000 -9,000,000 18,000,000 -36,000,000 24,000,000 -85,000,000 138,000,000 -31,000,000 23,000,000 29,666,000 -21,153,000 -4,191,000 5,785,000 -15,049,000 32,611,000 5,673,000 -15,574,000 -9,946,000 951,000 -13,442,000 377,000 -8,364,000 -16,627,000 -48,000 78,000     
          accounts payable and accrued expenses
        16,000,000 8,000,000 -13,000,000 -17,000,000 -17,000,000 -2,000,000 32,000,000 -73,000,000 39,000,000 96,000,000 24,000,000 -10,000,000 -8,000,000 21,000,000 -2,000,000 8,000,000 -13,000,000 5,000,000 -21,000,000 12,000,000 23,000,000 12,000,000 -58,000,000 28,000,000 -13,000,000 1,000,000 -71,000,000 34,000,000 27,000,000 -5,000,000 -54,000,000 65,000,000 6,000,000 16,000,000 -46,000,000 12,000,000   -9,000,000 14,000,000 -17,000,000   36,000,000 4,000,000   -5,000,000 39,000,000 44,000,000 26,000,000 -17,000,000 11,000,000 -19,000,000 -17,000,000 -5,000,000 37,000,000 9,000,000 -1,000,000 -44,000,000 15,000,000 34,000,000 -122,000,000 4,000,000 -8,000,000 1,000,000 -28,153,000 16,098,000 6,867,000 24,960,000 -14,611,000 -22,717,000 -26,277,000 32,355,000 40,105,000 6,580,000 43,000 -4,577,000 16,192,000 8,576,000 2,980,000 -718,000     
          section 31 fees payable to sec
        -411,000,000 147,000,000 -55,000,000 245,000,000 -140,000,000 144,000,000 -14,000,000 64,000,000 -164,000,000 58,000,000 -118,000,000   122,000,000 -9,000,000 48,000,000 -158,000,000 41,000,000 -93,000,000 161,000,000 -255,000,000 157,000,000 29,000,000 98,000,000 -136,000,000 101,000,000 -40,000,000 88,000,000 -204,000,000   97,000,000 -138,000,000 88,000,000 -27,000,000 82,000,000 -134,000,000 75,000,000 -18,000,000 73,000,000 -122,000,000 65,000,000 -42,000,000 98,000,000   -126,000,000 74,000,000 -26,000,000 73,000,000 -132,000,000 87,000,000 -37,000,000 76,000,000 -117,000,000 77,000,000 -12,000,000 63,000,000   -80,000,000 96,000,000 -72,000,000 89,000,000 -25,000,000 35,024,000 -95,365,000 32,037,000 -25,888,000 83,859,000 -112,564,000               
          accrued personnel costs
        50,000,000 35,000,000 74,000,000 -134,000,000 23,000,000 97,000,000 24,000,000 -110,000,000 41,000,000 57,000,000 1,000,000 -86,000,000  50,000,000 -1,000,000 -82,000,000 33,000,000 51,000,000 -4,000,000 -52,000,000 38,000,000 33,000,000 14,000,000 -53,000,000 49,000,000 20,000,000 1,000,000 -79,000,000 59,000,000 31,000,000 6,000,000 -59,000,000 41,000,000 5,000,000 11,000,000 -98,000,000   36,000,000 -89,000,000 51,000,000 27,000,000 22,000,000 -67,000,000  -58,000,000   22,000,000 -52,000,000 28,000,000 10,000,000 15,000,000 -80,000,000 27,000,000 20,000,000 18,000,000 -55,000,000 23,000,000 18,000,000 15,000,000 -54,000,000 10,000,000 14,000,000 10,000,000 -75,000,000 68,383,000 -30,054,000 5,285,000 -22,742,000 17,498,000 13,013,000 8,824,000 -30,276,000 13,260,000 6,019,000 4,008,000 -23,494,000 9,400,000 9,215,000 8,821,000 -30,300,000     
          deferred revenue
        79,000,000 -128,000,000 -139,000,000 257,000,000 59,000,000 -136,000,000 -130,000,000 274,000,000 -2,000,000 -99,000,000 -111,000,000 300,000,000 -70,000,000 -109,000,000 -97,000,000 292,000,000 -32,000,000 -57,000,000 -60,000,000 255,000,000 -55,000,000 -60,000,000 -74,000,000 204,000,000 -67,000,000 -60,000,000 -74,000,000 186,000,000 -67,000,000 -57,000,000 -77,000,000 208,000,000 -47,000,000 -72,000,000 -73,000,000 149,000,000 -61,000,000 -65,000,000 -36,000,000 147,000,000   -63,000,000 121,000,000 -3,000,000 128,000,000  -34,000,000 -58,000,000 105,000,000 -32,000,000 -43,000,000 -47,000,000 127,000,000 -34,000,000 -50,000,000 -38,000,000 108,000,000 -35,000,000 -40,000,000 -28,000,000 117,000,000 -29,000,000 -47,000,000 -18,000,000 98,000,000 -38,415,000 -50,760,000 -44,590,000 93,305,000 -32,973,000 -37,552,000 -33,385,000 111,085,000 -36,021,000 -30,459,000 -20,597,000 86,688,000 -33,299,000 -30,584,000 -23,460,000 83,597,000 -25,459,000 -19,293,000 -17,380,000 67,048,000 
          other liabilities
        15,000,000 80,000,000 -38,000,000 -56,000,000 -37,000,000 -17,000,000 32,000,000 35,000,000 -21,000,000 -22,000,000 -60,000,000 40,000,000 -34,000,000 -38,000,000 27,000,000 -15,000,000 -5,000,000 -272,000,000 14,000,000 -13,000,000 -105,000,000 114,000,000 -8,000,000 36,000,000 -5,000,000 -165,000,000 351,000,000 74,000,000 10,000,000 35,000,000 1,000,000 7,000,000 -44,000,000 -5,000,000 -19,000,000 40,000,000 -47,000,000 2,000,000 -20,000,000 23,000,000 30,000,000 -6,000,000 13,000,000 5,000,000 20,000,000   11,000,000 5,000,000 -27,000,000 -29,000,000 11,000,000 28,000,000 -37,000,000 1,000,000 16,000,000 -2,000,000 -2,000,000 7,000,000 -9,000,000 -14,000,000 11,000,000 -23,000,000 14,000,000 -6,000,000 26,782,000 -1,822,000 -6,845,000 -501,000 27,181,000 -28,874,000 291,000 -9,327,000 -1,091,000 -392,000 -815,000 105,000 -7,265,000 -962,000 -1,139,000 286,000 2,125,000    
          net cash from operating activities
        625,000,000 221,000,000 746,000,000 663,000,000 705,000,000 244,000,000 460,000,000 530,000,000 417,000,000 300,000,000 414,000,000 565,000,000 494,000,000 232,000,000 375,000,000 605,000,000 384,000,000 232,000,000 73,000,000 394,000,000 435,000,000 -4,000,000 441,000,000 380,000,000 339,000,000 101,000,000 186,000,000 337,000,000 360,000,000 14,000,000 279,000,000 375,000,000 300,000,000 95,000,000 270,000,000 244,000,000 269,000,000 61,000,000 141,000,000 251,000,000 213,000,000 66,000,000 175,000,000 231,000,000 280,000,000 183,000,000  82,000,000 106,000,000 149,000,000 238,000,000 38,000,000 210,000,000 108,000,000 233,000,000 6,000,000                               
          capital expenditures
        -89,000,000 -69,000,000 -59,000,000 -49,000,000 -60,000,000 -56,000,000 -52,000,000 -39,000,000 -42,000,000 -37,000,000 -39,000,000 -40,000,000 -34,000,000 -41,000,000 -42,000,000 -35,000,000 -50,000,000 -32,000,000 -39,000,000 -42,000,000 -60,000,000 -60,000,000 -42,000,000 -26,000,000 -39,000,000 -25,000,000 -43,000,000 -20,000,000 -39,000,000 -27,000,000 -29,000,000 -16,000,000 -42,000,000 -38,000,000 -28,000,000 -36,000,000 -49,000,000 -34,000,000 -28,000,000 -23,000,000 -42,000,000 -32,000,000 -35,000,000 -24,000,000 -47,000,000 -31,000,000  -35,000,000 -25,000,000 -20,000,000 -24,000,000 -22,000,000 -25,000,000 -16,000,000 -37,000,000 -27,000,000                               
          free cash flows
        536,000,000 152,000,000 687,000,000 614,000,000 645,000,000 188,000,000 408,000,000 491,000,000 375,000,000 263,000,000 375,000,000 525,000,000 460,000,000 191,000,000 333,000,000 570,000,000 334,000,000 200,000,000 34,000,000 352,000,000 375,000,000 -64,000,000 399,000,000 354,000,000 300,000,000 76,000,000 143,000,000 317,000,000 321,000,000 -13,000,000 250,000,000 359,000,000 258,000,000 57,000,000 242,000,000 208,000,000 220,000,000 27,000,000 113,000,000 228,000,000 171,000,000 34,000,000 140,000,000 207,000,000 233,000,000 152,000,000  47,000,000 81,000,000 129,000,000 214,000,000 16,000,000 185,000,000 92,000,000 196,000,000 -21,000,000                               
          cash flows from investing activities:
                                                                                              
          purchases of securities
        -9,000,000 -34,000,000 -95,000,000 -105,000,000 -54,000,000 -38,000,000 -74,000,000 -40,000,000 -182,000,000 -119,000,000 -213,000,000 -198,000,000 -59,000,000 -62,000,000 -99,000,000 -102,000,000 -47,000,000 -62,000,000 -147,000,000 -60,000,000 -31,000,000 -103,000,000 -57,000,000 -92,000,000 -195,000,000 -73,000,000 -210,000,000 -101,000,000                                                           
          proceeds from sales and redemptions of securities
        35,000,000 67,000,000 220,000,000 105,000,000 58,000,000 22,000,000 75,000,000 44,000,000 292,000,000 131,000,000 112,000,000 184,000,000 15,000,000 83,000,000 146,000,000 76,000,000 19,000,000 106,000,000 132,000,000 28,000,000 30,000,000 138,000,000 120,000,000 114,000,000 114,000,000 120,000,000 171,000,000 138,000,000                                                           
          proceeds from divestitures, net of cash divested
        88,000,000                                                                                     
          acquisition of businesses, net of cash and cash equivalents acquired
                      -2,430,000,000 -157,000,000             -1,247,000,000 -213,000,000 -226,000,000                                           
          purchases of property and equipment
        -89,000,000 -69,000,000 -59,000,000 -49,000,000 -60,000,000 -56,000,000 -52,000,000 -39,000,000 -42,000,000 -37,000,000 -39,000,000 -40,000,000 -34,000,000 -41,000,000 -42,000,000 -35,000,000 -50,000,000 -32,000,000 -39,000,000 -42,000,000 -60,000,000 -60,000,000 -42,000,000 -26,000,000 -39,000,000 -25,000,000 -43,000,000 -20,000,000 -39,000,000 -27,000,000 -29,000,000 -16,000,000 -42,000,000 -38,000,000 -28,000,000 -36,000,000 -49,000,000 -34,000,000 -28,000,000 -23,000,000 -42,000,000 -32,000,000 -35,000,000 -24,000,000 -47,000,000 -31,000,000  -35,000,000 -25,000,000 -20,000,000 -24,000,000 -22,000,000 -25,000,000 -16,000,000 -37,000,000 -27,000,000 -14,000,000 -10,000,000 -10,000,000 -12,000,000 -9,000,000 -11,000,000 -13,000,000 -15,000,000 -15,000,000 -16,000,000 -15,684,000 -12,561,000 -12,545,000 -13,929,000 -4,812,000 -5,901,000 -3,699,000 -4,077,000 -8,775,000 -6,271,000 -5,339,000 -650,000 -11,858,000 -4,512,000 -3,793,000 -5,239,000     
          investments related to default funds and margin deposits
        -661,000,000 -44,000,000 -171,000,000 -204,000,000 -944,000,000 151,000,000 270,000,000 -184,000,000 -138,000,000 167,000,000 -14,000,000 -89,000,000 167,000,000 246,000,000 170,000,000 -372,000,000                                                                       
          other investing activities
        -2,000,000 -65,000,000 -6,000,000 -5,000,000 -8,000,000 -6,000,000 -5,000,000 -13,000,000 -8,000,000 -5,000,000 10,000,000 -15,000,000 -7,000,000 12,000,000 43,000,000 -3,000,000 -17,000,000 -66,000,000 -1,000,000 -35,000,000 13,000,000 -12,000,000 7,000,000 -1,000,000 -7,000,000 -6,000,000                                                           
          net cash from investing activities
        -638,000,000 -145,000,000 -59,000,000 -258,000,000 -1,008,000,000 73,000,000 214,000,000 -232,000,000 -5,836,000,000 134,000,000 -159,000,000 -133,000,000 74,000,000 219,000,000 146,000,000 -390,000,000 -213,000,000 -5,000,000 70,000,000 -2,505,000,000 -74,000,000 -12,000,000 9,000,000 -154,000,000 -109,000,000 32,000,000 -89,000,000 -74,000,000 -31,000,000 76,000,000 159,000,000 -8,000,000 -817,000,000 31,000,000 -96,000,000 -8,000,000 -66,000,000 -18,000,000 -1,279,000,000 -294,000,000 -59,000,000 36,000,000 -92,000,000 -326,000,000 -59,000,000 -46,000,000  -42,000,000 -1,128,000,000 -14,000,000 -101,000,000 -13,000,000 -77,000,000 63,000,000 -50,000,000 -20,000,000                               
          cash flows from financing activities:
                                                                                              
          repayments of commercial paper
             -50,000,000 -174,000,000 -67,000,000  -138,000,000 -207,000,000 -317,000,000                    -18,000,000                                                       
          repayments of debt and credit commitment
        -100,000,000 -69,000,000 -400,000,000 -257,000,000                                                                                   
          proceeds from issuances of debt, net of issuance costs
                597,000,000 -5,000,000                                                                             
          repurchases of common stock
        -286,000,000 -115,000,000 -100,000,000 -115,000,000 -87,000,000   -110,000,000 -159,000,000 -166,000,000 -142,000,000 -58,000,000 -248,000,000 -162,000,000 -36,000,000 -34,000,000 -30,000,000 -122,000,000 -150,000,000                                                             
          dividends paid
        -153,000,000 -155,000,000 -155,000,000 -138,000,000 -138,000,000 -138,000,000 -138,000,000 -127,000,000 -127,000,000 -108,000,000 -108,000,000 -98,000,000 -98,000,000 -99,000,000 -97,000,000 -89,000,000 -90,000,000 -91,000,000 -88,000,000 -81,000,000 -81,000,000 -81,000,000 -80,000,000 -78,000,000 -77,000,000 -78,000,000 -77,000,000 -73,000,000                                                           
          payments related to employee shares withheld for taxes
        -6,000,000 -4,000,000 -34,000,000 -25,000,000 -4,000,000 -2,000,000 -30,000,000 -24,000,000 -2,000,000 -2,000,000 -28,000,000 -40,000,000 -5,000,000 -1,000,000 -20,000,000 -52,000,000 -12,000,000 -2,000,000 -8,000,000 -39,000,000 -9,000,000 -3,000,000 -28,000,000 -8,000,000 -1,000,000 -30,000,000 -6,000,000 -1,000,000 -1,000,000 -42,000,000 -6,000,000 -16,000,000 -2,000,000 -47,000,000 -7,000,000 -1,000,000 -23,000,000 -34,000,000 -6,000,000 -1,000,000 -3,000,000 -24,000,000 -8,000,000 -21,000,000                                         
          default funds and margin deposits
        -37,000,000 503,000,000 -801,000,000 -549,000,000 290,000,000 76,000,000 -79,000,000 -1,317,000,000 801,000,000 -1,143,000,000 362,000,000 2,000,000 -3,006,000,000 1,892,000,000 2,698,000,000 856,000,000                                                                       
          other financing activities
          1,000,000 30,000,000      -1,000,000 2,000,000 1,000,000 -1,000,000 -1,000,000 -1,000,000 9,000,000 -1,000,000 1,000,000 2,000,000                     1,000,000     -3,000,000        -2,000,000                           
          net cash from financing activities
        -567,000,000 159,000,000 -1,462,000,000 -1,083,000,000 -24,000,000 -204,000,000 -458,000,000 -1,875,000,000 1,201,000,000 -1,397,000,000 5,029,000,000 -613,000,000 -3,239,000,000 1,572,000,000 2,335,000,000 368,000,000 2,119,000,000 -321,000,000 -532,000,000 152,000,000 1,791,000,000 -114,000,000 -762,000,000 468,000,000 -208,000,000 -156,000,000 -271,000,000 -302,000,000 -121,000,000 -71,000,000 -498,000,000 -337,000,000 365,000,000 46,000,000 -272,000,000 -192,000,000 -91,000,000 -130,000,000 1,155,000,000 68,000,000 -141,000,000 -133,000,000 -92,000,000 4,000,000 -70,000,000 -153,000,000  -121,000,000 812,000,000 -35,000,000 -82,000,000 -86,000,000 -158,000,000 -159,000,000 -220,000,000 -9,000,000                               
          effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents
        73,000,000 5,000,000 245,000,000 403,000,000 -462,000,000 205,000,000 31,000,000 -311,000,000 502,000,000 -70,000,000 -259,000,000 29,000,000 431,000,000 -1,042,000,000 -518,000,000 -164,000,000 -323,000,000 -4,000,000 7,000,000 -11,000,000 13,000,000                                                                  
          net decrease in cash and cash equivalents and restricted cash and cash equivalents
        -507,000,000 240,000,000 -530,000,000 -275,000,000    -1,888,000,000                                                                               
          cash and cash equivalents, restricted cash and cash equivalents at beginning of period
        5,006,000,000 7,118,000,000 6,994,000,000 5,496,000,000                                                                       
          cash and cash equivalents, restricted cash and cash equivalents at end of period
        -507,000,000 240,000,000 -530,000,000 4,731,000,000 -789,000,000 318,000,000 247,000,000 5,230,000,000 -3,716,000,000 -1,033,000,000 5,025,000,000 6,842,000,000 -2,240,000,000 981,000,000 2,338,000,000 5,915,000,000                                                                       
          reconciliation of cash, cash equivalents and restricted cash and cash equivalents
                                                                                              
          cash and cash equivalents
        134,000,000 -262,000,000 42,000,000 690,000,000 326,000,000 -150,000,000 28,000,000 388,000,000 -4,887,000,000 -7,000,000 4,974,000,000 373,000,000 201,000,000 -153,000,000 -32,000,000 486,000,000                                                                       
          restricted cash and cash equivalents
        -17,000,000 32,000,000 177,000,000 18,000,000 -11,000,000 18,000,000 3,000,000 21,000,000 -5,000,000 2,000,000 -34,000,000 57,000,000 -29,000,000 21,000,000 -1,000,000 31,000,000                                                                       
          total
        -507,000,000 240,000,000 -530,000,000 4,731,000,000 -789,000,000 318,000,000 247,000,000 5,230,000,000 -3,716,000,000 -1,033,000,000 5,025,000,000 6,842,000,000 -2,240,000,000 981,000,000 2,338,000,000 5,915,000,000                                                                       
          supplemental disclosure cash flow information
                                                                                              
          cash paid for:
                                                                                              
          interest paid
        71,000,000 74,000,000 84,000,000 125,000,000 90,000,000 89,000,000 81,000,000 145,000,000 88,000,000 22,000,000 30,000,000 37,000,000 33,000,000 23,000,000                                                                         
          income taxes paid, net of refunds
                                                                                              
          deferred income taxes
         18,000,000 6,000,000 6,000,000 -5,000,000 -22,000,000 -38,000,000 -2,000,000 24,000,000 14,000,000 18,000,000 12,000,000 21,000,000 -18,000,000 18,000,000 17,000,000 39,000,000 35,000,000 20,000,000 22,000,000 22,000,000 -2,000,000 -1,000,000 56,000,000 -20,000,000 15,000,000 -16,000,000 313,000,000 24,000,000 -27,000,000 -9,000,000 14,000,000 -12,000,000 -21,000,000 29,000,000 -126,000,000   2,000,000 47,000,000 3,000,000 -9,000,000 -55,000,000  -10,000,000  13,000,000 -5,000,000 -23,000,000 36,000,000 16,000,000 -28,000,000 -8,000,000 22,000,000 3,000,000                               
          net income from unconsolidated investees
         -23,000,000 -23,000,000 -27,000,000   -3,000,000 -3,000,000  11,000,000 11,000,000 -14,000,000 -8,000,000 -8,000,000 -8,000,000 -7,000,000 38,000,000 -6,000,000 -27,000,000 -57,000,000 27,000,000 -54,000,000 -26,000,000 -17,000,000 -13,000,000 -16,000,000 -10,000,000 -45,000,000 -5,000,000 -6,000,000 -5,000,000 -2,000,000 -5,000,000 -4,000,000 -2,000,000 -4,000,000      -1,000,000 -1,000,000 -14,000,000            -1,000,000                               
          proceeds received from employee stock activity and other issuances
              11,000,000   7,000,000 -1,000,000   9,000,000   36,000,000 1,000,000                                                                 
          income taxes paid, net of refund
         44,000,000 131,000,000 45,000,000 122,000,000 134,000,000 79,000,000 23,000,000 56,000,000 62,000,000 118,000,000 18,000,000 70,000,000 71,000,000                                                                         
          net change in operating assets and liabilities:
                                                                                              
          proceeds from (repayments of) commercial paper
                    459,000,000 -220,000,000 419,000,000 -420,000,000 -60,000,000 259,000,000 -214,000,000 435,000,000 -349,000,000 -42,000,000 -148,000,000 72,000,000 -73,000,000 265,000,000 -35,000,000 41,000,000                                                         
          asr agreement
                    -325,000,000                                                                      
          net increase in cash and cash equivalents and restricted cash and cash equivalents
            -789,000,000 318,000,000   -3,716,000,000 -1,033,000,000 5,025,000,000 -152,000,000 -2,240,000,000 981,000,000 2,338,000,000 419,000,000 1,967,000,000 -98,000,000 -382,000,000 -1,970,000,000 2,165,000,000                                                                  
          repayments of term loan
             -340,000,000                                                                               
          payment of debt extinguishment cost and bridge fees
                                                                                            
          net gain on divestiture of business
                                  -27,000,000                                                           
          net change in operating assets and liabilities, net of effects of acquisitions:
                                                                                              
          proceeds from divestiture of business, net of cash divested
                                                                                             
          extinguishment of debt
                         36,000,000                                                               
          proceeds from sale of investment securities
                                                                                              
          payment of debt extinguishment cost
                         -36,000,000                                                           
          proceeds from issuances of debt, net of issuance costs and utilization of credit commitment
                    541,000,000                                                                       
          repayments of borrowings under our credit commitment
                                                                                             
          interest
                       23,000,000  9,000,000 51,000,000 19,000,000 28,000,000 36,000,000 33,000,000 23,000,000 12,000,000 62,000,000 23,000,000 27,000,000 32,000,000 56,000,000 33,000,000 15,000,000 17,000,000 68,000,000 29,000,000 23,000,000 29,000,000 39,000,000 28,000,000 12,000,000 26,000,000 38,000,000 27,000,000 11,000,000 36,000,000  37,000,000 3,000,000 37,000,000 2,000,000 38,000,000 2,000,000 38,000,000 5,000,000 45,000,000 3,000,000 33,000,000 4,000,000   4,000,000 13,000,000 20,000,000 16,000,000 22,000,000 30,401,000 22,040,000 13,650,000 1,126,000   23,083,000 25,849,000     6,710,000 4,645,000 1,487,000 2,863,000 2,868,000 2,873,000 2,874,000 2,868,000 
          income taxes, net of refund
                       29,000,000 76,000,000 32,000,000 348,000,000 45,000,000 72,000,000 138,000,000 39,000,000 41,000,000 16,000,000 60,000,000 107,000,000 22,000,000 26,000,000 96,000,000 72,000,000 27,000,000 28,000,000 67,000,000 33,000,000 26,000,000 24,000,000 40,000,000 92,000,000 35,000,000 56,000,000 35,000,000 93,000,000 18,000,000 43,000,000 11,000,000  5,000,000 89,000,000 11,000,000 61,000,000 37,000,000 57,000,000 22,000,000 40,000,000 52,000,000 37,000,000 35,000,000   14,000,000 -1,000,000 17,000,000 87,000,000 50,000,000 50,310,000 64,422,000 125,201,000 26,330,000   50,992,000 11,126,000       18,907,000 5,035,000     
          net gain on divestiture of businesses
                                                                                           
          proceeds from divestiture of businesses, net of cash divested
                                                                                              
          repayments of borrowings under our credit commitment and debt obligations
                        -704,000,000 -100,000,000 2,000,000                                                                 
          cash paid for: interest
                                                                                              
          proceeds from issuances of long-term debt, net of issuance costs and utilization of credit commitment
                         726,000,000 100,000,000 1,879,000,000                                                                 
          cash and cash equivalents and restricted cash and cash equivalents at beginning of period
                         2,782,000,000                                                                  
          cash and cash equivalents and restricted cash and cash equivalents at end of period
                         -98,000,000 -382,000,000 812,000,000 2,165,000,000                                                                  
          reversal of certain swedish tax benefits
                                                                                            
          gain on sale of investment security
                                                                                              
          net change in operating assets and liabilities, net of effects of divestiture and acquisitions:
                                                                                              
          proceeds from divestiture of businesses
                                24,000,000   -8,000,000                                                         
          proceeds from divestiture of business
                                   108,000,000                                                           
          effect of exchange rate changes on cash and cash equivalents and restricted cash
                              9,000,000 -12,000,000 7,000,000 -7,000,000 -2,000,000 -8,000,000 2,000,000 1,000,000   5,000,000 8,000,000 2,000,000                                                   
          net increase in cash and cash equivalents and restricted cash
                              -303,000,000 682,000,000    -47,000,000 210,000,000 20,000,000 -73,000,000 30,000,000 -152,000,000 177,000,000 -90,000,000 46,000,000                                                   
          cash and cash equivalents and restricted cash at beginning of period
                              362,000,000 586,000,000 399,000,000 418,000,000                                                   
          cash and cash equivalents and restricted cash at end of period
                              -303,000,000 1,044,000,000 29,000,000 -30,000,000 -176,000,000 539,000,000 210,000,000 20,000,000 -73,000,000 429,000,000 -152,000,000 177,000,000 -90,000,000 464,000,000                                                   
          repayments of debt obligations
                               -671,000,000                                                             
          proceeds from utilization of credit commitment
                               799,000,000             20,000,000 45,000,000 508,000,000 325,000,000 140,000,000 235,000,000 31,000,000 100,000,000                                           
          proceeds from issuances of long-term debt, net of issuance costs
                               644,000,000                                                             
          proceeds of customer funds
                                   36,000,000                                                           
          proceeds from sale of investment security
                                                                                             
          acquisition of business, net of cash and cash equivalents acquired
                                 -193,000,000                                                           
          proceeds received from employee stock activity
                                 1,000,000   7,000,000   21,000,000 2,000,000 29,000,000 1,000,000 12,000,000 14,000,000 27,000,000 1,000,000 10,000,000 2,000,000 11,000,000 6,000,000 10,000,000 7,000,000                                         
          net decrease in cash and cash equivalents and restricted cash
                                 -30,000,000                                                             
          repayments of long-term debt
                                   -515,000,000 -115,000,000 -25,000,000 -13,000,000                                                     
          proceeds from long-term debt issuances
                                   15,000,000                                                           
          asset impairment charge
                                                             12,000,000                                 
          acquisition of businesses, net of cash and cash equivalents acquired and other investment activities
                                                                                              
          proceeds from long-term debt issuances, net of debt issuance costs
                                                                                              
          net assets held for sale
                                       11,000,000 -1,000,000                                                      
          purchases of trading securities
                                     -62,000,000 -162,000,000 -70,000,000 -75,000,000 -57,000,000 -141,000,000 -93,000,000 -67,000,000 -131,000,000 -101,000,000 -144,000,000 -81,000,000 -75,000,000 -130,000,000 -60,000,000 -44,000,000 -96,000,000  -113,000,000 -75,000,000 -112,000,000 -125,000,000 -12,000,000 -146,000,000 -18,000,000 -104,000,000 -81,000,000 -234,000,000 -114,000,000 -49,000,000 -19,000,000 -50,000,000 -119,000,000 -300,000,000 -96,000,000 -107,000,000 -104,000,000                     
          proceeds from sales and redemptions of trading securities
                                     160,000,000 64,000,000 75,000,000 60,000,000 133,000,000 81,000,000 120,000,000 64,000,000 134,000,000 100,000,000 94,000,000 83,000,000 119,000,000 88,000,000 29,000,000 35,000,000 93,000,000  106,000,000 132,000,000 118,000,000 63,000,000 61,000,000 151,000,000 97,000,000 115,000,000 88,000,000 198,000,000 100,000,000 134,000,000 38,000,000 15,000,000 163,000,000 237,000,000 102,000,000 108,000,000 95,000,000                     
          purchases of available-for-sale investment securities
                                     -15,000,000 -3,000,000 -14,000,000 -7,000,000 -5,000,000     -12,000,000 1,000,000 -15,000,000 -12,000,000 -3,000,000                                          
          proceeds from maturities of available-for-sale investment securities
                                     13,000,000 13,000,000 6,000,000 24,000,000 6,000,000 12,000,000 7,000,000                                               
          other investment activities
                                       30,000,000 -31,000,000   4,000,000 -10,000,000                                              
          proceeds from utilization of credit commitment, net of debt issuance costs
                                        140,000,000                                                     
          proceeds from issuances of senior unsecured notes, net of debt issuance costs
                                                                                             
          cash paid for repurchase of common stock
                                     -54,000,000 -241,000,000 -99,000,000 -28,000,000 -19,000,000 -156,000,000 -55,000,000 -16,000,000 -29,000,000 -67,000,000 -255,000,000 -25,000,000 -30,000,000 -57,000,000   -10,000,000 -50,000,000 -50,000,000 -125,000,000 -50,000,000     -497,000,000 -100,000,000                           
          cash dividends paid
                                     -72,000,000 -73,000,000 -63,000,000                                                       
          gain on divestiture of businesses, net of disposal costs
                                                                                              
          capital contribution in equity method investment
                                                -30,000,000                                           
          proceeds from commercial paper
                                        326,000,000 -340,000,000                                                     
          proceeds from issuance of term loan facility
                                               399,000,000                                               
          cash dividends
                                        -63,000,000 -64,000,000 -63,000,000 -53,000,000 -53,000,000 -53,000,000 -53,000,000 -41,000,000 -41,000,000 -40,000,000 -43,000,000 -25,000,000 -25,000,000 -22,000,000  -22,000,000 -22,000,000 -21,000,000 -22,000,000 -21,000,000                                   
          proceeds (disbursements) of customer funds
                                          -61,000,000 63,000,000                                                   
          proceeds from issuances of senior unsecured notes and term loan facility
                                                                                            
          payments of debt obligations
                                            -38,000,000 -85,000,000 -478,000,000 -555,000,000 -193,000,000 -85,000,000 -66,000,000 -25,000,000 -123,000,000 -146,000,000  -168,000,000 -12,000,000 -11,000,000 -11,000,000 -12,000,000 -11,000,000 -111,000,000 -378,000,000 -450,000,000 -85,000,000 -35,000,000 -405,000,000 -70,000,000 -41,000,000 -1,700,000,000 1,000,000 -113,000,000 -148,000,000 -80,000,000 -37,500,000 -37,500,000 -352,918,000 -1,055,482,000 -2,671,000 -2,670,000 -252,668,000 -18,305,000           
          excess tax benefits related to share-based payments
                                            -16,000,000 -5,000,000 -35,000,000 2,000,000 -29,000,000 -21,000,000 3,000,000 2,000,000                                           
          non-cash merger and strategic initiatives
                                                    18,000,000                                         
          asset impairment charges
                                                                                             
          non-cash investing activities:
                                                                                              
          cost method investment
                                                    75,000,000                                         
          effect of exchange rate changes on cash and cash equivalents
                                             -4,000,000 5,000,000      2,000,000     4,000,000 8,000,000 -9,000,000 7,000,000 -12,000,000 1,000,000 4,000,000 13,000,000 -11,000,000 -8,000,000 -3,000,000 17,000,000 15,000,000 -2,000,000 -30,429,000                    
          net decrease in cash and cash equivalents
                                                 -34,000,000 -4,000,000 -99,000,000   125,000,000 -79,000,000                                       
          cash and cash equivalents at beginning of period
                                             301,000,000 427,000,000 398,000,000  497,000,000        315,000,000 594,000,000 374,000,000 1,325,314,000   321,995,000  165,237,000  58,186,000  148,929,000 
          cash and cash equivalents at end of period
                                             -87,000,000 13,000,000 331,000,000 11,000,000 -34,000,000 -4,000,000 328,000,000 141,000,000 384,000,000  -79,000,000 -212,000,000 591,000,000        439,000,000 -21,000,000 -190,000,000 -9,000,000 535,000,000 283,000,000 -108,000,000 86,000,000 333,000,000 -172,140,000 -2,099,000 3,979,000 736,020,000   81,749,000 493,249,000  -48,272,000 113,912,000 374,905,000  -15,522,000 220,345,000 83,941,000  -174,399,000 88,777,000 133,608,000 
          net increase in cash and cash equivalents
                                              13,000,000 30,000,000      -14,000,000    94,000,000 59,000,000 -53,000,000 -34,000,000 19,000,000 -37,000,000 -35,000,000                               
          net (income) income from unconsolidated investees
                                                                  -1,000,000                           
          proceeds from sale of available-for-sale investment security
                                                                                              
          acquisition of espeed contingent future issuance of nasdaq common stock
                                                                                              
          net change in operating assets and liabilities, net of effects of acquisition:
                                                                                              
          proceeds from sale of available-for-sale investment securities
                                                 26,000,000 3,000,000                                           
          loss on divestiture of business
                                                                                              
          net change in operating assets and liabilities, net of effects of acquisitions and divestiture:
                                                                                              
          purchase of equity and cost method investments
                                                                                             
          acquisitions of businesses, net of cash and cash equivalents acquired
                                                         -15,000,000 -40,000,000                -751,035,000 -25,482,000 -1,963,562,000    1,243,000 -15,899,000 -38,060,000         
          proceeds from debt obligations, net of debt issuance costs
                                                       70,000,000       250,000,000    734,000,000 -1,000,000 -2,000,000 1,678,000,000     -4,019,000 948,799,000 -1,220,000 1,478,188,000                 
          investment in lch clearnet group, limited
                                                                                              
          excess tax benefits related to share-based compensation
                                                     3,000,000  2,000,000 -15,000,000 2,000,000   -1,000,000 -4,000,000 -3,000,000 -3,000,000 -1,000,000 1,000,000 -1,000,000 -1,000,000 -1,000,000 -2,000,000 -1,000,000                     
          proceeds from sales of available-for-sale investment securities
                                                                                              
          acquisitions of businesses
                                                                                              
          proceeds from debt obligations
                                                     25,000,000                             150,000,000           
          benefit from bad debts
                                                     4,000,000    1,000,000   2,000,000 2,000,000 1,000,000 2,000,000 1,000,000 1,000,000 2,000,000 1,000,000 1,000,000 -1,000,000 -1,000,000          3,490,000             
          other non-cash items included in net income
                                                          7,000,000 -4,000,000 4,000,000 1,000,000 -7,000,000    8,000,000    -4,000,000   4,000,000 2,458,000 1,559,000 3,525,000 -2,695,000 154,000 -5,007,000 977,000 1,726,000 -1,268,000 294,000 710,000 203,000 -306,000 -6,784,000 8,867,000 766,000 4,643,000 -1,424,000 2,183,000 2,216,000 
          net cash provided by:
                                                                                              
          operating activities
                                                                                              
          investing activities
                                                                                              
          financing activities
                                                                                              
          cash and cash equivalents at the beginning of period
                                                           506,000,000                                
          cash and cash equivalents at the end of period
                                                           -53,000,000 -34,000,000 525,000,000  -35,000,000                               
          income from unconsolidated investees
                                                                          157,000 163,000                   
          amortization of debt issuance costs
                                                       1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 2,000,000 2,000,000                             
          accretion of debt discounts
                                                       1,000,000 1,000,000 1,000,000 1,000,000 2,000,000 1,000,000 1,000,000 4,000,000 4,000,000 4,000,000                             
          issuances of common stock, net of treasury stock purchases
                                                       2,000,000 10,000,000 5,000,000   1,000,000 1,000,000 1,000,000 1,000,000 3,000,000 5,000,000 1,000,000 1,000,000 3,000,000 1,000,000 1,000,000 6,000,000 1,000,000 2,132,000 2,887,000 1,806,000 816,000 6,270,000 4,810,000 3,560,000 2,178,000 5,145,000 1,742,000 628,000 19,611,000         
          acquisition of espeed contingent future issuance of nasdaq omx common stock
                                                                                             
          investment in lch clearnet group limited
                                                                                              
          provision for bad debts
                                                          1,000,000               2,000,000 6,840,000   966,000     724,000 -2,152,000 1,843,000 49,000 3,039,000 133,000 -744,000 570,000 -247,000 772,000 407,000 142,000 
          asset retirements and impairment charges
                                                        10,000,000             2,000,000                        
          adjustments to reconcile net income to cash from operating activities:
                                                                                              
          loss on divestiture of businesses
                                                                                            
          charges related to debt extinguishment and refinancing
                                                                                              
          net change in operating assets and liabilities, net of effects of acquisitions and divestitures:
                                                                                              
          proceeds from sales of equity method investments
                                                                                             
          proceeds from contributions of noncontrolling interests
                                                                  2,000,000                          
          investment in lch.clearnet group limited
                                                                                              
          loss on sale of business
                                                                                              
          charges related to debt refinancing
                                                                  37,000,000                         
          loss on asset retirements
                                                               6,000,000                               
          supplemental disclosures:
                                                                                              
          supplemental disclosures
                                                                                              
          gain on the early extinguishment of debt obligations
                                                                                              
          loss on sale of investment security
                                                                                            
          gain on sales of businesses
                                                                                              
          debt conversion expense
                                                                                             
          purchase of equity method investment
                                                                                              
          proceeds from sales and redemptions of available-for-sale investment securities
                                                                                              
          acquisitions of businesses, net of cash acquired
                                                                                              
          dispositions of businesses, net of cash disposed
                                                                                              
          purchases of noncontrolling interests
                                                                  -2,000,000                         
          cash inducement payment
                                                                                             
          proceeds from sale of equity method investment
                                                                                            
          acquisitions of businesses, net of cash and cash equivalents acquired and purchase accounting adjustments
                                                                 -114,000,000 -72,000,000   14,000,000 -1,000,000 -13,000,000 -6,000,000                     
          cash flows from operating activities
                                                                                              
          deferred taxes
                                                                 -11,000,000 -30,000,000 4,000,000 -9,000,000 -13,000,000 38,000,000 -16,000,000 -19,000,000 -41,387,000 -23,039,000 -8,850,000 -29,869,000 4,471,000 12,670,000 -1,700,000 -31,023,000 16,701,000 -1,946,000 1,477,000 -2,828,000 -362,000 5,559,000 -1,076,000 -652,000 7,408,000 13,502,000   
          asset retirements
                                                                   2,000,000 3,000,000                         
          other current liabilities
                                                                 28,000,000 -49,000,000                            
          cash from operating activities
                                                                 171,000,000 183,000,000 34,000,000 239,000,000 -16,000,000 354,000,000 4,000,000 141,000,000 83,000,000 241,277,000 -106,072,000 56,408,000 216,112,000 56,246,000 -63,307,000 102,301,000 77,996,000 54,407,000 59,382,000 33,570,000 53,716,000 17,500,000 8,402,000 8,796,000 86,205,000     
          cash flows from investing activities
                                                                                              
          cash from investing activities
                                                                 -24,000,000 -39,000,000 -65,000,000 -47,000,000 33,000,000 -64,000,000 -8,000,000 63,000,000 -44,000,000 -366,125,000 -795,018,000 -53,790,000 -1,933,737,000 -2,682,000 1,792,819,000 -23,958,000 91,699,000 -79,684,000 -92,307,000 -1,021,911,000 -80,481,000 -881,756,000 -41,339,000 29,538,000 -59,826,000     
          cash flows from financing activities
                                                                                              
          cash from financing activities
                                                                 -27,000,000 -165,000,000 -172,000,000 -190,000,000 -68,000,000 -4,000,000 -121,000,000 -133,000,000 -78,000,000 -16,863,000 916,045,000 1,361,000 1,128,331,000 13,088,000 -1,045,848,000 3,406,000 1,559,000 -93,273,000 -15,347,000 1,102,253,000 236,433,000 740,729,000 17,415,000 182,011,000 -624,000     
          increase in cash and cash equivalents
                                                                 124,000,000         -172,140,000 -2,099,000 3,979,000 -589,294,000 66,652,000 683,664,000 81,749,000 171,254,000 -118,550,000 -48,272,000 113,912,000 209,668,000 -123,527,000 -15,522,000 220,345,000 25,755,000     
          loss on foreign currency contracts
                                                                          47,408,000   -35,254,000                 
          accretion of 2.50% convertible senior notes
                                                                  3,000,000 4,000,000 3,000,000 4,000,000 3,000,000                        
          purchases of foreign currency contracts
                                                                          -12,500,000                 
          settlement of foreign currency contracts
                                                                          66,515,000                 
          dispositions of businesses, net of cash and cash equivalents disposed
                                                                                              
          net proceeds from exercise of warrants
                                                                                              
          proceeds from sale of available-for-sale investment
                                                                                              
          decrease in cash and cash equivalents
                                                                     -59,000,000    -41,000,000                     
          other accrued liabilities
                                                                    -11,000,000 17,000,000 36,000,000 -27,000,000 -27,000,000 -19,000,000 -8,377,000 -18,764,000 -22,971,000 41,105,000 -51,260,000 35,301,000 -12,229,000 9,942,000 2,703,000 16,075,000 -3,131,000 -10,630,000 -5,391,000 4,598,000 -6,613,000 3,293,000     
          proceeds from sales of property and equipment
                                                                                  27,000 30,243,000 64,000 234,000 42,000 24,000 17,899,000 75,000 11,052,000 19,000 228,000 
          proceeds from contribution of noncontrolling interests
                                                                                              
          net income attributable to noncontrolling interests
                                                                     1,000,000  1,000,000                       
          net income attributable to nasdaq omx
                                                                     61,000,000 43,000,000 60,000,000 69,000,000 94,000,000                     
          purchases of available-for-sale investments
                                                                         -13,000,000           -262,425,000 -155,100,000 -171,483,000 -187,739,000 -77,325,000     
          cash paid for share buyback
                                                                     -46,000,000                         
          net (income) loss attributable to noncontrolling interests
                                                                                              
          (gain) loss on the early extinguishment and refinancing of debt obligations
                                                                                              
          (income) income from unconsolidated investees
                                                                      87,000,000                       
          (gain) loss on foreign currency contracts
                                                                                              
          clearing contract charge
                                                                              10,620,000             
          strategic initiative costs
                                                                              1,584,000 24,927,000             
          gain on sale of strategic initiative
                                                                                             
          purchases of equity method investment
                                                                                              
          proceeds from maturities of available-for-sale investments
                                                                              4,000,000 17,200,000 30,710,000     13,100,000       
          proceeds from sales and redemptions of available-for-sale investments
                                                                          565,000                    
          conversion of 3.75% convertible notes
                                                                                              
          gain on early extinguishment of debt
                                                                                             
          proceeds from sale of available-for-sale investments
                                                                                              
          gain on foreign currency contracts
                                                                                              
          net expense attributable to noncontrolling interests
                                                                                              
          gain on the early extinguishment of debt
                                                                         -4,000,000                     
          loss from unconsolidated investees
                                                                         2,000,000                     
          loss on the early extinguishment and refinancing of debt obligations
                                                                              1,125,000    1,148,000           
          payables to related parties
                                                                                  664,000 341,000 541,000 -9,609,000 7,687,000 1,999,000 -2,074,000 972,000     
          purchases of trading investment securities
                                                                          -92,531,000 -46,033,000 -15,763,000 -10,261,000                 
          net proceeds from equity offerings
                                                                                  -301,000           
          series c cumulative preferred stock, net of treasury stock purchases
                                                                                              
          income tax benefit related to share-based compensation
                                                                           -1,859,000 -775,000 -2,245,000 25,602,000 -4,824,000 -2,517,000 -2,051,000 44,965,000 -1,216,000 -34,263,000 15,272,000         
          impairment of intangible assets
                                                                                              
          foreign currency translation adjustment
                                                                           -31,708,000 -2,059,000 11,595,000                 
          other
                                                                               221,000 204,000 -77,000             
          proceeds from redemptions of available-for-sale investments
                                                                                  128,475,000 60,800,000 196,725,000 195,670,000 201,745,000 147,800,000 195,055,000 14,600,000 34,896,000 63,521,000 87,292,000 55,172,000 
          gain from unconsolidated investees
                                                                             -26,336,000                 
          income tax payable
                                                                             73,391,000 -63,990,000                
          cash paid for
                                                                                              
          income tax provision related to share-based compensation
                                                                                              
          gain on foreign currency option contracts
                                                                              -18,202,000                
          loss on the write-down of assets held-for-sale
                                                                                              
          proceeds from maturities of held-to-maturity investments
                                                                                      35,421,000 9,500,000 -2,000,000 5,000,000 7,100,000 4,000,000 15,728,000 
          proceeds from redemptions of held-to-maturity investments
                                                                                              
          purchases of held-to-maturity investments
                                                                                      -19,557,000 -9,468,000       
          purchase of foreign currency option contracts
                                                                                              
          settlement of foreign currency option contracts
                                                                              4,037,000 63,900,000             
          acquisitions of businesses, net of cash and cash equivalents acquired, and purchase accounting adjustments
                                                                                              
          series c cumulative preferred stock redemptions and dividends
                                                                                            
          cash and cash equivalents at beginning of year
                                                                                              
          cash and cash equivalents at end of year
                                                                                              
          reconciliation of net income to cash from operating activities
                                                                                              
          non-cash items included in net income:
                                                                                              
          purchases of foreign currency option contracts
                                                                                             
          loss on foreign currency option contracts
                                                                                1,668,000 7,841,000             
          purchases of available-for-sale investments, net of capital return from the lse in 2006
                                                                                              
          net income from discontinued operations
                                                                                              
          net income from continuing operations
                                                                                          -2,127,000 -5,485,000 4,785,000 4,631,000 
          obligation under capital leases
                                                                                              
          purchases of available-for-sale investments, net of capital return from the lse
                                                                                  -176,091,000 -171,180,000           
          supplemental disclosure non-cash flow activity
                                                                                              
          exchange of preferred securities
                                                                                              
          loss on write down of assets held-for-sale
                                                                                   518,000           
          accounts receivable
                                                                                   9,927,000           
          accrued pension costs
                                                                                   -43,000 -702,000 -498,000 1,144,000 -4,015,000 1,647,000 1,712,000    995,000 
          proceeds from the maturities of available-for-sale investments
                                                                                   10,000,000 4,000,000 24,750,000         
          contribution from minority interest holder
                                                                                              
          depreciation and amortization expense
                                                                                              
          share-based compensation expense
                                                                                    2,688,000 2,756,000         
          foreign currency gain related to investment in the lse
                                                                                              
          receivables from related parties
                                                                                    -41,000 -31,000 1,000 3,210,000 -2,996,000 397,000 21,000 7,682,000 
          cash flow from investing activities
                                                                                              
          cash flow from financing activities
                                                                                              
          net proceeds from the february 2006 equity offering
                                                                                     308,484,000         
          series c cumulative preferred stock redemption and dividends
                                                                                     -105,059,000         
          payment of debt obligations
                                                                                     -1,875,000         
          contribution to nasd
                                                                                      -1,524,000 -17,000 -49,000 -22,000     
          amortization of restricted stock awards
                                                                                      46,000 532,000 463,000 317,000 132,000 182,000   
          charge on the restructuring of the 240.0 million convertible notes
                                                                                              
          elimination of non-core product lines and initiatives
                                                                                              
          cash from continuing operations
                                                                                              
          cash from discontinued operations
                                                                                              
          capital contribution to nasdaq liffe joint venture
                                                                                              
          proceeds from the issuances of debt obligations
                                                                                              
          redemption of senior notes
                                                                                              
          payments for treasury stock purchases
                                                                                      -31,000 -42,000     
          issuances of common stock
                                                                                      17,999,000 18,148,000 16,339,000 444,000 1,893,000   
          partial redemption of series c cumulative preferred stock
                                                                                      -1,000       
          preferred stock dividends
                                                                                         -1,004,000     
          minority interest
                                                                                              
          charge on the restructuring of the 240 million convertible notes
                                                                                              
          net change in:
                                                                                              
          purchase of remaining 50.0% interest in nasdaq insurance agency, net of cash acquired
                                                                                             
          funding for the acquisition of carpenter moore
                                                                                              
          acquisition of toll
                                                                                              
          proceeds from the issuance of the 205 million convertible notes
                                                                                             
          series c cumulative preferred stock dividends
                                                                                       -716,000       
          supplemental disclosure of non-cash flow activities
                                                                                              
          income taxes, net of refunds
                                                                                              
          other current assets
                                                                                        -6,434,000 -6,359,000     
          purchase of remaining 50.0% interest in nia, net of cash acquired
                                                                                         3,063,000     
          loss on assets held-for-sale
                                                                                              
          loss from equity method affiliates
                                                                                              
          nasdaq japan impairment loss
                                                                                              
          acquisition of toll associates llc
                                                                                              
          increase in long-term debt
                                                                                              
          contribution (to) from nasd
                                                                                              
          payments for treasury stock purchases with issuance of preferred stock
                                                                                              
          reconciliation of net income to cash provided by operating activities
                                                                                              
          net loss from discontinued operations
                                                                                              
          elimination of non-core product lines, initiatives and severance
                                                                                              
          cash provided by continuing operations
                                                                                           16,029,000 49,559,000 53,836,000 
          cash provided by operating activities
                                                                                           16,029,000 49,559,000 53,836,000 
          cash used in investing activities
                                                                                              
          decrease in long term debt
                                                                                              
          contribution to the nasd
                                                                                              
          cash used in financing activities
                                                                                              
          income tax refund, net of taxes paid
                                                                                           -14,499,000 -34,944,000 -2,074,000 
          (decrease) increase in cash and cash equivalents
                                                                                              
          net (loss) from discontinued operations
                                                                                              
          amortization of restricted stock awards and other stock-based compensation
                                                                                              
          minority interests
                                                                                              
          proceeds from phase i and phase ii private placement offering
                                                                                              
          (decrease) increase in long-term debt
                                                                                              
          purchase of minority interests in nasdaq europe planning company ltd.