7Baggers

Xcel Energy Inc
(NASDAQ:XEL) 

XEL stock logo

Xcel Energy Inc., through its subsidiaries, generates, purchases, transmits, distributes, and sells electricity. It operates through Regulated Electric Utility, Regulated Natural Gas Utility, and All Other segments. The company generates electricity through coal, nuclear, natural gas, hydroelectric,...

Founded: 1909
Full Time Employees: 11,273
Sector: Utilities
Industry: Utilities-Regulated Electric

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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 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 
                                                                   
      operating revenues
                                                                   
      electric
    2,976,000,000 2,809,000,000 3,638,000,000 2,878,000,000 2,835,000,000 2,410,000,000 3,393,000,000 2,659,000,000 2,685,000,000 2,695,000,000 3,387,000,000 2,601,000,000 2,763,000,000 2,868,000,000 3,699,000,000 2,923,000,000 2,633,000,000 2,562,000,000 3,176,000,000 2,597,000,000 2,870,000,000 2,372,000,000 2,941,000,000 2,286,000,000 2,203,000,000 2,230,000,000 2,771,000,000 2,249,000,000 2,325,000,000 2,300,000,000 2,802,000,000 2,348,000,000 2,270,000,000 2,255,354,000 2,783,569,000 2,338,017,000 2,299,060,000 2,290,556,000 2,799,964,000 2,224,142,000 2,185,119,000 2,170,183,000 2,667,480,000 2,213,460,000 2,224,863,000 2,250,191,000 2,616,351,000 2,297,638,000 2,301,710,000 2,122,047,000 2,599,925,000 2,219,877,000 2,092,196,000 2,010,976,000 2,532,709,000 2,036,829,000 1,936,782,000 1,988,800,000 2,619,424,000 2,128,397,000 2,029,972,000 1,974,634,000 2,440,917,000 
      natural gas
    1,030,000,000 737,000,000 264,000,000 396,000,000 1,055,000,000 695,000,000 239,000,000 355,000,000 941,000,000 719,000,000 245,000,000 393,000,000 1,288,000,000 1,157,000,000 357,000,000 476,000,000 1,090,000,000 768,000,000 268,000,000 449,000,000 647,000,000 554,000,000 219,000,000 280,000,000 583,000,000 544,000,000 222,000,000 308,000,000 794,000,000 558,000,000 227,000,000 292,000,000 662,000,000 520,205,000 214,253,000 289,839,000 625,703,000 484,868,000 221,956,000 258,899,000 565,689,000 455,935,000 216,019,000 284,131,000 715,996,000 657,274,000 236,649,000 369,127,000 879,688,000 588,404,000 205,358,000 341,321,000 669,596,000 520,513,000 174,513,000 221,313,000 621,035,000 560,109,000 194,930,000 291,538,000 765,349,000 572,428,000 170,594,000 
      other
    15,000,000 15,000,000 13,000,000 13,000,000 16,000,000 15,000,000 12,000,000 14,000,000 23,000,000 28,000,000 30,000,000 28,000,000 29,000,000 28,000,000 26,000,000 25,000,000 28,000,000 25,000,000 23,000,000 22,000,000 24,000,000 21,000,000 22,000,000 20,000,000 25,000,000 24,000,000 20,000,000 20,000,000 22,000,000 22,000,000 19,000,000 18,000,000 19,000,000 20,194,000 19,075,000 17,072,000 21,659,000 19,227,000 18,227,000 16,808,000 21,465,000 19,703,000 17,813,000 17,543,000 21,360,000 21,163,000 16,807,000 18,331,000 21,206,000 20,371,000 17,055,000 17,715,000 21,057,000 19,646,000 17,119,000 16,526,000 20,262,000 19,501,000 17,244,000 18,287,000 21,219,000 19,872,000 17,276,000 
      total operating revenues
    4,021,000,000 3,561,000,000 3,915,000,000 3,287,000,000 3,906,000,000 3,120,000,000 3,644,000,000 3,028,000,000 3,649,000,000 3,442,000,000 3,662,000,000 3,022,000,000 4,080,000,000 4,053,000,000 4,082,000,000 3,424,000,000 3,751,000,000 3,355,000,000 3,467,000,000 3,068,000,000 3,541,000,000 2,947,000,000 3,182,000,000 2,586,000,000 2,811,000,000 2,798,000,000 3,013,000,000 2,577,000,000 3,141,000,000 2,880,000,000 3,048,000,000 2,658,000,000 2,951,000,000 2,795,753,000 3,016,897,000 2,644,928,000 2,946,422,000 2,794,651,000 3,040,147,000 2,499,849,000 2,772,273,000 2,645,821,000 2,901,312,000 2,515,134,000 2,962,219,000 2,928,628,000 2,869,807,000 2,685,096,000 3,202,604,000 2,730,822,000 2,822,338,000 2,578,913,000 2,782,849,000 2,551,135,000 2,724,341,000 2,274,668,000 2,578,079,000 2,568,410,000 2,831,598,000 2,438,222,000 2,816,540,000 2,566,934,000 2,628,787,000 
      yoy
    2.94% 14.13% 7.44% 8.55% 7.04% -9.36% -0.49% 0.20% -10.56% -15.08% -10.29% -11.74% 8.77% 20.80% 17.74% 11.60% 5.93% 13.84% 8.96% 18.64% 25.97% 5.33% 5.61% 0.35% -10.51% -2.85% -1.15% -3.05% 6.44% 3.01% 1.03% 0.49% 0.16% 0.04% -0.76% 5.80% 6.28% 5.63% 4.79% -0.61% -6.41% -9.66% 1.10% -6.33% -7.51% 7.24% 1.68% 4.12% 15.08% 7.04% 3.60% 13.38% 7.94% -0.67% -3.79% -6.71% -8.47% 0.06% 7.72%     
      qoq
    12.92% -9.04% 19.11% -15.85% 25.19% -14.38% 20.34% -17.02% 6.01% -6.01% 21.18% -25.93% 0.67% -0.71% 19.22% -8.72% 11.80% -3.23% 13.01% -13.36% 20.16% -7.39% 23.05% -8.00% 0.46% -7.14% 16.92% -17.96% 9.06% -5.51% 14.67% -9.93% 5.55% -7.33% 14.06% -10.23% 5.43% -8.08% 21.61% -9.83% 4.78% -8.81% 15.35% -15.09% 1.15% 2.05% 6.88% -16.16% 17.28% -3.24% 9.44% -7.33% 9.08% -6.36% 19.77% -11.77% 0.38% -9.29% 16.13% -13.43% 9.72% -2.35%  
      operating expenses
                                                                   
      electric fuel and purchased power
    1,019,000,000 925,000,000 1,098,000,000 918,000,000 1,020,000,000 925,000,000 1,060,000,000 855,000,000 948,000,000 950,000,000 1,181,000,000 1,030,000,000 1,117,000,000 1,233,000,000 1,497,000,000 1,181,000,000 1,094,000,000 1,090,000,000 1,210,000,000 1,047,000,000 1,386,000,000 901,000,000 981,000,000 833,000,000 797,000,000 831,000,000 952,000,000 813,000,000 914,000,000 947,000,000 1,040,000,000 935,000,000 932,000,000 906,520,000 1,006,160,000 919,099,000 925,221,000 962,602,000 1,037,263,000 855,968,000 861,852,000 893,390,000 1,014,726,000 904,705,000 950,132,000 1,021,644,000 1,079,855,000 1,041,322,000 1,067,321,000 984,641,000 1,097,944,000 1,011,044,000 925,043,000 898,752,000 1,006,830,000 854,373,000 863,980,000 920,293,000 1,150,252,000 989,413,000 931,828,000 925,313,000 1,110,781,000 
      cost of natural gas sold and transported
    520,000,000 333,000,000 61,000,000 134,000,000 513,000,000 287,000,000 63,000,000 118,000,000 483,000,000 372,000,000 70,000,000 170,000,000 844,000,000 776,000,000 173,000,000 251,000,000 710,000,000 478,000,000 86,000,000 218,000,000 299,000,000 264,000,000 54,000,000 86,000,000 285,000,000 272,000,000 55,000,000 112,000,000 479,000,000 306,000,000 58,000,000 104,000,000 375,000,000 279,548,000 63,998,000 114,320,000 365,134,000 262,935,000 67,566,000 90,071,000 312,117,000 239,685,000 66,071,000 126,667,000 472,371,000 438,406,000 99,344,000 210,901,000 623,828,000 379,764,000 74,847,000 188,765,000 439,375,000 323,495,000 49,739,000 89,759,000 417,946,000 370,351,000 87,107,000 163,056,000 543,376,000 388,279,000 66,571,000 
      cost of sales — other
    3,000,000 3,000,000 5,000,000 1,000,000 2,000,000 2,000,000 3,000,000 1,000,000 8,000,000 12,000,000 14,000,000 11,000,000 12,000,000 12,000,000 11,000,000 11,000,000 10,000,000 10,000,000 11,000,000 9,000,000 8,000,000 9,000,000 11,000,000 8,000,000 9,000,000 12,000,000 9,000,000 10,000,000 10,000,000 9,000,000 9,000,000 8,000,000 8,000,000 8,784,000 8,451,000 8,178,000 8,587,000 10,850,000 8,648,000 8,332,000 8,245,000 9,800,000 8,203,000 8,164,000 10,049,000 9,569,000 8,012,000 7,642,000 9,129,000 9,491,000 7,540,000 7,881,000 8,411,000 8,568,000 7,251,000 5,944,000 7,304,000 8,291,000 7,154,000 6,891,000 8,055,000 8,296,000 8,848,000 
      operating and maintenance expenses
    675,000,000 679,000,000 692,000,000 675,000,000 686,000,000 618,000,000 655,000,000 662,000,000 605,000,000 580,000,000 586,000,000 628,000,000 650,000,000    602,000,000 569,000,000 568,000,000 600,000,000 584,000,000 616,000,000 579,000,000 550,000,000 579,000,000 574,000,000 580,000,000 586,000,000 597,000,000 623,000,000 593,000,000 578,000,000 557,000,000 596,898,000 541,539,000 578,133,000 586,430,000 562,161,000 590,009,000 596,978,000 577,410,000 583,577,000 565,984,000 594,279,000 585,830,000 620,241,000 568,391,000 585,604,000 560,143,000 606,439,000 575,305,000 562,557,000 529,231,000 599,917,000 531,480,000 534,014,000 510,684,000       
      conservation and demand side management expenses
    121,000,000 107,000,000 101,000,000 88,000,000 110,000,000 99,000,000 112,000,000 86,000,000 97,000,000 71,000,000 76,000,000 63,000,000 76,000,000 72,000,000 86,000,000 81,000,000 92,000,000 82,000,000 78,000,000 71,000,000 73,000,000 73,000,000 73,000,000 68,000,000 74,000,000 53,000,000 75,000,000 65,000,000 72,000,000 54,000,000 77,000,000 69,000,000 71,000,000 51,530,250 73,728,000 64,860,000                            
      depreciation and amortization
    768,000,000 753,000,000 750,000,000 722,000,000 728,000,000 702,000,000 681,000,000 703,000,000 658,000,000 641,000,000 618,000,000 565,000,000 624,000,000 606,000,000 607,000,000 638,000,000 562,000,000 535,000,000 537,000,000 528,000,000 521,000,000 499,000,000 513,000,000 473,000,000 463,000,000 446,000,000 447,000,000 439,000,000 433,000,000 443,000,000 440,000,000 377,000,000 383,000,000 376,985,000 371,091,000 365,720,000 365,204,000 332,146,000 328,503,000 322,534,000 320,020,000 296,703,000 280,121,000 274,602,000 273,098,000 262,400,000 255,395,000 255,307,000 245,943,000 256,732,000 228,491,000 243,934,000 248,706,000 231,689,000 239,051,000 226,641,000 228,672,000 194,303,000 242,329,000 229,264,000 224,723,000 219,579,000 221,671,000 
      taxes
    183,000,000 172,000,000 172,000,000 172,000,000 170,000,000 140,000,000 159,000,000 154,000,000 171,000,000 168,000,000 168,000,000 137,000,000 184,000,000 165,000,000 173,000,000 179,000,000 171,000,000 158,000,000 152,000,000 157,000,000 163,000,000 159,000,000 158,000,000 146,000,000 149,000,000 140,000,000 137,000,000 142,000,000 150,000,000 139,000,000 135,000,000 137,000,000 145,000,000 134,409,000 133,571,000 134,926,000 142,094,000 131,089,000 117,190,000 138,469,000 145,323,000 122,237,000 123,081,000 129,731,000 136,626,000 106,898,000 117,958,000 116,278,000 124,702,000 99,735,000 105,287,000 102,051,000 113,427,000 103,032,000 100,636,000 99,632,000 105,624,000 96,738,000 89,018,000 92,489,000 96,570,000 87,719,000 81,791,000 
      marshall wildfire litigation
    -22,000,000 9,000,000 287,000,000                                                             
      total operating expenses
    3,267,000,000 2,981,000,000 3,166,000,000 2,710,000,000 3,229,000,000 2,773,000,000 2,733,000,000 2,579,000,000 2,970,000,000 2,867,000,000 2,747,000,000 2,604,000,000 3,507,000,000 3,528,000,000 3,158,000,000 2,955,000,000 3,241,000,000 2,922,000,000 2,642,000,000 2,630,000,000 3,034,000,000 2,521,000,000 2,369,000,000 2,164,000,000 2,356,000,000 2,348,000,000 2,255,000,000 2,167,000,000 2,655,000,000 2,541,000,000 2,352,000,000 2,208,000,000 2,471,000,000 2,370,023,000 2,198,538,000 2,185,236,000 2,460,203,000 2,329,301,000 2,213,093,000 2,068,268,000 2,282,403,000 2,204,811,000 2,115,500,000 2,092,289,000 2,611,374,000 2,537,378,000 2,204,127,000 2,287,888,000 2,708,612,000 2,405,240,000 2,157,225,000 2,176,677,000 2,328,225,000 2,234,738,000 2,003,907,000 1,868,978,000 2,197,917,000 2,224,409,000 2,180,102,000 2,078,780,000 2,389,877,000 2,244,564,000 2,060,157,000 
      operating income
    754,000,000 580,000,000 749,000,000 577,000,000 677,000,000 347,000,000 911,000,000 449,000,000 679,000,000 575,000,000 915,000,000 418,000,000 573,000,000 525,000,000 924,000,000 469,000,000 510,000,000 433,000,000 825,000,000 438,000,000 507,000,000 426,000,000 813,000,000 422,000,000 455,000,000 450,000,000 758,000,000 410,000,000 486,000,000 339,000,000 696,000,000 450,000,000 480,000,000 425,730,000 818,359,000 459,692,000 486,219,000 465,350,000 827,054,000 431,581,000 489,870,000 441,010,000 785,812,000 422,845,000 350,845,000 391,250,000 665,680,000 397,208,000 493,992,000 325,582,000 665,113,000 402,236,000 454,624,000 316,397,000 720,434,000 405,690,000 380,162,000 344,001,000 651,496,000 359,442,000 426,663,000 322,370,000 568,630,000 
      yoy
    11.37% 67.15% -17.78% 28.51% -0.29% -39.65% -0.44% 7.42% 18.50% 9.52% -0.97% -10.87% 12.35% 21.25% 12.00% 7.08% 0.59% 1.64% 1.48% 3.79% 11.43% -5.33% 7.26% 2.93% -6.38% 32.74% 8.91% -8.89% 1.25% -20.37% -14.95% -2.11% -1.28% -8.51% -1.05% 6.51% -0.75% 5.52% 5.25% 2.07% 39.63% 12.72% 18.05% 6.45% -28.98% 20.17% 0.09% -1.25% 8.66% 2.90% -7.68% -0.85% 19.59% -8.02% 10.58% 12.87% -10.90% 6.71% 14.57%     
      qoq
    30.00% -22.56% 29.81% -14.77% 95.10% -61.91% 102.90% -33.87% 18.09% -37.16% 118.90% -27.05% 9.14% -43.18% 97.01% -8.04% 17.78% -47.52% 88.36% -13.61% 19.01% -47.60% 92.65% -7.25% 1.11% -40.63% 84.88% -15.64% 43.36% -51.29% 54.67% -6.25% 12.75% -47.98% 78.02% -5.46% 4.48% -43.73% 91.63% -11.90% 11.08% -43.88% 85.84% 20.52% -10.33% -41.23% 67.59% -19.59% 51.73% -51.05% 65.35% -11.52% 43.69% -56.08% 77.58% 6.72% 10.51% -47.20% 81.25% -15.76% 32.35% -43.31%  
      operating margin %
    18.75% 16.29% 19.13% 17.55% 17.33% 11.12% 25.00% 14.83% 18.61% 16.71% 24.99% 13.83% 14.04% 12.95% 22.64% 13.70% 13.60% 12.91% 23.80% 14.28% 14.32% 14.46% 25.55% 16.32% 16.19% 16.08% 25.16% 15.91% 15.47% 11.77% 22.83% 16.93% 16.27% 15.23% 27.13% 17.38% 16.50% 16.65% 27.20% 17.26% 17.67% 16.67% 27.08% 16.81% 11.84% 13.36% 23.20% 14.79% 15.42% 11.92% 23.57% 15.60% 16.34% 12.40% 26.44% 17.84% 14.75% 13.39% 23.01% 14.74% 15.15% 12.56% 21.63% 
      other income
    22,000,000 114,000,000 46,000,000 68,000,000 7,000,000 68,000,000 39,000,000 22,000,000 14,000,000 3,000,000 3,000,000 11,000,000 5,000,000 7,000,000 -15,000,000 -6,000,000 1,000,000  -3,000,000 3,000,000 5,000,000  1,000,000 5,000,000 -11,000,000 2,000,000 8,000,000 2,000,000 4,000,000    1,000,000 8,857,000 5,089,000 2,608,000 6,446,000 1,562,000 578,000 1,560,000 4,250,000 -348,000 1,626,000 961,000 3,161,000 609,000 1,404,000 82,000 3,201,000 -959,000 -404,000 413,000 3,922,000 1,222,000 488,000 728,000 3,737,000 960,000 2,550,000 979,000 4,766,000 1,009,000 27,450,000 
      earnings from equity method investments
    13,000,000 20,000,000 6,000,000 -8,000,000 -1,000,000  3,000,000 8,000,000 8,000,000 8,000,000 7,000,000 9,000,000 11,000,000 9,000,000 1,000,000 11,000,000 15,000,000 15,000,000 13,000,000 20,000,000                                            
      allowance for funds used during construction — equity
    92,000,000 85,000,000 79,000,000 69,000,000 48,000,000 49,000,000 44,000,000 38,000,000 37,000,000 28,000,000 26,000,000 18,000,000 19,000,000 22,000,000 20,000,000 20,000,000 13,000,000 20,000,000 21,000,000 18,000,000 14,000,000 24,000,000 30,000,000 37,000,000 23,000,000 22,000,000 15,000,000 20,000,000 20,000,000 29,000,000 30,000,000 26,000,000 23,000,000 20,818,000 23,483,000 16,386,000 14,313,000 15,505,000 17,199,000 14,730,000 13,113,000 15,208,000 15,427,000 12,641,000 12,660,000 20,898,000 23,337,000 23,608,000 21,907,000 24,536,000 21,284,000 22,109,000 19,754,000 18,336,000 15,860,000 15,194,000 13,450,000 12,533,000 11,840,000 13,606,000 13,244,000 16,402,000 13,464,000 
      interest charges and financing costs
                                                                   
      interest charges — includes other financing costs
    412,000,000 403,000,000 384,000,000 349,000,000 332,000,000 319,000,000 326,000,000 319,000,000 291,000,000                                                       
      allowance for funds used during construction — debt
    -40,000,000 -39,000,000 -36,000,000 -27,000,000 -23,000,000 -22,000,000 -21,000,000 -16,000,000 -14,000,000 -15,000,000 -14,000,000 -12,000,000 -10,000,000 -9,000,000 -7,000,000 -7,000,000 -5,000,000 -8,000,000 -7,000,000 -6,000,000 -5,000,000 -9,000,000 -11,000,000 -12,000,000 -10,000,000 -10,000,000 -7,000,000 -10,000,000 -10,000,000 -13,000,000 -13,000,000 -11,000,000 -11,000,000 -9,641,000 -10,724,000 -7,613,000 -7,022,000 -6,822,000 -7,532,000 -6,684,000 -5,990,000 -6,908,000 -7,031,000 -6,165,000 -6,144,000 -8,793,000 -9,948,000 -10,113,000 -9,548,000 -10,728,000 -9,377,000 -10,316,000 -8,758,000 -10,586,000 -10,439,000 -7,683,000 -6,607,000 -6,606,000 -6,301,000 -7,838,000 -7,436,000 -8,035,000 -6,323,000 
      total interest charges and financing costs
    372,000,000 364,000,000 348,000,000 322,000,000 309,000,000 297,000,000 305,000,000 303,000,000 277,000,000 250,000,000 255,000,000 256,000,000 243,000,000 239,000,000 237,000,000 240,000,000 209,000,000 206,000,000 204,000,000 206,000,000 200,000,000 203,000,000 210,000,000 196,000,000 189,000,000 185,000,000 192,000,000 179,000,000 179,000,000 164,000,000 164,000,000 164,000,000 160,000,000 155,427,000 157,079,000 156,582,000 158,912,000 154,805,000 158,325,000 156,296,000 150,453,000 146,646,000 145,535,000 138,057,000 138,796,000 136,102,000 133,271,000 129,287,000 129,546,000 133,272,000 135,381,000 136,512,000 130,855,000 133,526,000 143,280,000 144,238,000 145,223,000 145,789,000 141,710,000 138,500,000 136,918,000 139,122,000 138,526,000 
      income before income taxes
    509,000,000 435,000,000 532,000,000 384,000,000 422,000,000 167,000,000 692,000,000 214,000,000 461,000,000 364,000,000 696,000,000 200,000,000 365,000,000 324,000,000 693,000,000 254,000,000 330,000,000 262,000,000 652,000,000 273,000,000 340,000,000 258,000,000 646,000,000 274,000,000 289,000,000 299,000,000 599,000,000 262,000,000 340,000,000 208,000,000 564,000,000 319,000,000 350,000,000 307,482,000 696,932,000 329,645,000 355,941,000 337,235,000 696,207,000 301,192,000 369,962,000 319,254,000 665,492,000 306,812,000 235,646,000 284,156,000 564,551,000 299,422,000 396,992,000               
      income tax benefit
    -47,000,000   -60,000,000 -61,000,000   -88,000,000 -27,000,000   -88,000,000 -53,000,000   -74,000,000 -50,000,000   -38,000,000 -22,000,000                                           
      net income
    556,000,000 567,000,000 524,000,000 444,000,000 483,000,000 464,000,000 682,000,000 302,000,000 488,000,000 409,000,000 656,000,000 288,000,000 418,000,000 379,000,000 649,000,000 328,000,000 380,000,000 315,000,000 609,000,000 311,000,000 362,000,000 288,000,000 603,000,000 287,000,000 295,000,000 292,000,000 527,000,000 238,000,000 315,000,000 214,000,000 491,000,000 265,000,000 291,000,000 189,326,000 492,141,000 227,256,000 239,277,000 227,477,000 457,795,000 196,795,000 241,312,000 209,025,000 426,463,000 196,931,000 152,066,000 196,339,000 368,582,000 195,164,000 261,221,000 150,055,000 364,752,000 196,857,000 236,570,000 140,170,000 398,106,000 183,060,000 183,893,000 140,509,000 338,332,000 158,762,000 203,569,000 136,634,000 312,306,000 
      yoy
    15.11% 22.20% -23.17% 47.02% -1.02% 13.45% 3.96% 4.86% 16.75% 7.92% 1.08% -12.20% 10.00% 20.32% 6.57% 5.47% 4.97% 9.38% 1.00% 8.36% 22.71% -1.37% 14.42% 20.59% -6.35% 36.45% 7.33% -10.19% 8.25% 13.03% -0.23% 16.61% 21.62% -16.77% 7.50% 15.48% -0.84% 8.83% 7.35% -0.07% 58.69% 6.46% 15.70% 0.91% -41.79% 30.84% 1.05% -0.86% 10.42% 7.05% -8.38% 7.54% 28.65% -0.24% 17.67% 15.30% -9.67% 2.84% 8.33%     
      qoq
    -1.94% 8.21% 18.02% -8.07% 4.09% -31.96% 125.83% -38.11% 19.32% -37.65% 127.78% -31.10% 10.29% -41.60% 97.87% -13.68% 20.63% -48.28% 95.82% -14.09% 25.69% -52.24% 110.10% -2.71% 1.03% -44.59% 121.43% -24.44% 47.20% -56.42% 85.28% -8.93% 53.70% -61.53% 116.56% -5.02% 5.19% -50.31% 132.63% -18.45% 15.45% -50.99% 116.55% 29.50% -22.55% -46.73% 88.86% -25.29% 74.08% -58.86% 85.29% -16.79% 68.77% -64.79% 117.47% -0.45% 30.88% -58.47% 113.11% -22.01% 48.99% -56.25%  
      net income margin %
    13.83% 15.92% 13.38% 13.51% 12.37% 14.87% 18.72% 9.97% 13.37% 11.88% 17.91% 9.53% 10.25% 9.35% 15.90% 9.58% 10.13% 9.39% 17.57% 10.14% 10.22% 9.77% 18.95% 11.10% 10.49% 10.44% 17.49% 9.24% 10.03% 7.43% 16.11% 9.97% 9.86% 6.77% 16.31% 8.59% 8.12% 8.14% 15.06% 7.87% 8.70% 7.90% 14.70% 7.83% 5.13% 6.70% 12.84% 7.27% 8.16% 5.49% 12.92% 7.63% 8.50% 5.49% 14.61% 8.05% 7.13% 5.47% 11.95% 6.51% 7.23% 5.32% 11.88% 
      weighted-average common shares outstanding:
                                                                   
      basic
    624,000,000 587,000,000 592,000,000 586,000,000 575,000,000 563,000,000 564,000,000 557,000,000 556,000,000 552,000,000 552,000,000 551,000,000 551,000,000 547,000,000 548,000,000 546,000,000 545,000,000 539,000,000 539,000,000 539,000,000 538,000,000 527,000,000 526,000,000 527,000,000 526,000,000 519,000,000 519,000,000 516,000,000 515,000,000 511,000,000 510,000,000 510,000,000 509,000,000 509,000,000 508,581,000 508,542,000 508,278,000 508,794,000 508,941,000 508,930,000 508,667,000 507,768,000 508,031,000 507,707,000 506,983,000 503,847,000 506,082,000 503,272,000 499,523,000 496,073,000 498,149,000 497,747,000 489,781,000 487,899,000 488,084,000 487,717,000 487,360,000 485,039,000 485,344,000 484,918,000 483,641,000 462,052,000 460,471,000 
      diluted
    626,000,000 589,000,000 595,000,000 588,000,000 577,000,000 563,000,000 565,000,000 557,000,000 556,000,000 552,000,000 552,000,000 552,000,000 551,000,000 547,000,000 548,000,000 546,000,000 545,000,000 540,000,000 539,000,000 539,000,000 539,000,000 528,000,000 528,000,000 527,000,000 527,000,000 520,000,000 521,000,000 518,000,000 516,000,000 511,000,000 511,000,000 510,000,000 509,000,000 509,000,000 509,242,000 509,135,000 508,774,000 509,465,000 509,566,000 509,490,000 509,150,000 508,168,000 508,427,000 508,074,000 507,393,000 504,117,000 506,365,000 503,456,000 499,746,000 496,532,000 498,641,000 498,036,000 490,531,000 488,434,000 488,578,000 488,017,000 487,995,000 485,615,000 485,894,000 485,241,000 484,301,000 463,391,000 462,019,000 
      earnings per average common share:
                                                                   
      basic
    890,000 960,000 880,000 760,000 840,000 810,000 1,210,000 540,000 880,000 740,000 1,190,000 520,000 760,000 700,000 1,190,000 600,000 700,000 580,000 1,130,000 580,000 670,000 540,000 1,150,000 540,000 560,000 550,000 1,020,000 460,000 610,000 420,000 960,000 520,000 570,000 2,258,110 970 450 470 450 900 390 470 410 840 390 300 390 730 390 520 300 730 400 480 392.5 820 380 380    420   
      diluted
    890,000 950,000 880,000 750,000 840,000 810,000 1,210,000 540,000 880,000 740,000 1,190,000 520,000 760,000 690,000 1,180,000 600,000 700,000 580,000 1,130,000 580,000 670,000 540,000 1,140,000 540,000 560,000 560,000 1,010,000 460,000 610,000 420,000 960,000 520,000 570,000 2,248,120 970 450 470 450 900 390 470 410 840 390 300 390 730 390 520 300 730 400 480 392.5 810 380 380    420   
      see notes to consolidated financial statements
                                                                   
      income tax expense
     -28,250,000 8,000,000   -26,250,000 10,000,000   -25,250,000 40,000,000   -20,000,000 44,000,000   -53,000,000 43,000,000   -30,000,000 43,000,000 -13,000,000 -6,000,000                                       
      loss on comanche unit 3 litigation
             1,000,000 34,000,000                                                     
      interest charges — includes other financing costs of 8, 8, 24 and 24, respectively
             197,500,000 269,000,000                                                     
      interest charges — includes other financing costs of 8, 8, 16 and 16, respectively
               268,000,000                                                    
      interest charges — includes other financing costs of 8
                253,000,000                                                   
      o&m expenses
                 456,750,000 611,000,000 614,000,000                                                
      interest charges — includes other financing costs of 8, 7, 24 and 22, respectively
                 176,250,000 244,000,000                                                 
      interest charges — includes other financing costs of 8, 7, 16 and 14, respectively
                   247,000,000                                                
      interest charges — includes other financing costs of 8 and 7, respectively
                    214,000,000                                               
      interest charges — includes other financing costs of 7, 7, 22 and 21, respectively
                     157,000,000 211,000,000                                             
      interest charges — includes other financing costs of 7, 7, 14 and 14, respectively
                       212,000,000                                            
      equity earnings of unconsolidated subsidiaries
                        14,000,000 11,000,000 12,000,000 6,000,000 11,000,000 10,000,000 10,000,000 9,000,000 9,000,000 10,000,000 9,000,000 9,000,000 6,000,000 7,504,000 7,080,000 7,541,000 7,875,000 9,623,000 9,701,000 9,617,000 13,182,000 10,030,000 8,162,000 8,422,000 7,776,000 7,501,000 7,401,000 7,811,000 7,438,000 7,641,000 7,273,000 7,529,000 7,577,000 7,821,000 7,490,000 7,502,000 7,158,000 7,714,000 7,423,000 7,677,000 7,713,000 7,515,000 7,670,000 
      interest charges — includes other financing costs of 7 and 7, respectively
                        205,000,000                                           
      interest charges — includes other financing costs of 7, 6, 21 and 19, respectively
                         157,000,000 221,000,000                                         
      interest charges — includes other financing costs of 7, 6, 14 and 13, respectively
                           208,000,000                                        
      interest charges — includes other financing costs of 7 and 6, respectively
                            199,000,000                                       
      interest charges — includes other financing costs of 6, 6, 19 and 18, respectively
                             144,500,000 199,000,000                                     
      income taxes
                             7,000,000 72,000,000 24,000,000 25,000,000 -6,000,000 73,000,000 54,000,000 59,000,000 118,156,000 204,791,000 102,389,000 116,664,000 109,758,000 238,412,000 104,397,000 128,650,000 110,229,000 239,029,000 109,881,000 83,580,000 87,817,000 195,969,000 104,258,000 135,771,000 73,300,000 193,349,000 98,893,000 118,434,000 70,042,000 202,845,000 101,801,000 75,515,000 78,478,000 193,304,000 84,533,000 112,001,000 71,671,000 166,200,000 
      interest charges — includes other financing costs of 6, 6, 13 and 12, respectively
                               189,000,000                                    
      interest charges — includes other financing costs of 6 and 6, respectively
                                189,000,000    171,000,000                               
      other expense
                                 -6,000,000 -7,000,000 -2,000,000                                
      interest charges — includes other financing costs of 6, 6, 18 and 18, respectively
                                 130,750,000 177,000,000                                 
      cash dividends declared per common share
                                 285,000 380,000 380,000 380,000 1,438,920 360 360 360 340 340 340 340 320 320 320 320 300 300 300 300 280 280 280 270 -798.93 270 270 260 0.26 0.26 0.26 250 0.25 0.25 
      interest charges — includes other financing costs of 6, 6, 12 and 12, respectively
                                   175,000,000                                
      interest charges — includes other financing costs of 5,923, 6,060, 17,657 and 19,026, respectively
                                     124,483,000 167,803,000                             
      interest charges — includes other financing costs of 5,876, 6,630, 11,734 and 12,966, respectively
                                       164,195,000                            
      conservation and demand side management program expenses
                                        67,533,000 67,518,000 63,914,000 55,916,000 57,436,000 59,419,000 57,314,000 54,141,000 53,805,000 78,220,000 75,172,000 70,834,000 77,546,000 68,438,000 67,811,000 60,445,000 64,032,000 69,285,000 68,920,000 58,615,000 63,707,000 69,303,000 71,280,000 65,497,000 75,298,000 65,376,000 60,861,000 
      interest charges — includes other financing costs of 5,858 and 6,336, respectively
                                        165,934,000                           
      loss on monticello life cycle management/extended power uprate project
                                                129,463,000                   
      interest charges — includes other financing costs of 6,0606,260, 19,026 and 17,819, respectively
                                         121,320,000 165,857,000                         
      interest charges — includes other financing costs of 6,6305,861, 12,966 and 11,559, respectively
                                           162,980,000                        
      interest charges — includes other financing costs of 6,336 and 5,698, respectively
                                            156,443,000                       
      interest charges — includes other financing costs of 6,260,5,737, 17,819 and 17,144, respectively
                                             110,432,000 152,566,000                     
      interest charges — includes other financing costs of 5,861,5,614, 11,559 and 11,406, respectively
                                               144,222,000                    
      interest charges — includes other financing costs of 5,698 and 5,792, respectively
                                                144,940,000                   
      interest charges — includes other financing costs of 5,737, 6,020, 17,144 and 24,058, respectively
                                                 105,428,250 143,219,000                 
      interest charges — includes other financing costs of 5,614, 12,229, 11,406 and 18,038, respectively
                                                   139,400,000                
      interest charges — includes other financing costs of 5,792 and 5,809, respectively
                                                    139,094,000               
      interest charges — includes other financing costs of 6,020, 6,010, 24,058 and 18,126, respectively
                                                     107,799,750 144,758,000             
      income from continuing operations before income taxes
                                                     302,170,500 557,885,000 295,775,000 355,022,000 210,250,000 600,992,000 284,876,000 259,284,000 219,419,000 531,599,000 243,204,000 315,468,000 208,174,000 478,688,000 
      income from continuing operations
                                                     199,501,500 364,536,000 196,882,000 236,588,000 140,208,000 398,147,000 183,075,000 183,769,000 140,941,000 338,295,000 158,671,000 203,467,000 136,503,000 312,488,000 
      income from discontinued operations, net of tax
                                                     43,250 216,000 -25,000 -18,000 -38,000 -41,000 -15,000 124,000 -432,000 37,000 91,000 102,000 131,000 -182,000 
      interest charges — includes other financing costs of 12,229, 6,036, 18,038 and 12,116, respectively
                                                       146,828,000            
      interest charges — includes other financing costs of 5,809 and 6,080, respectively
                                                        139,613,000           
      interest charges — includes other financing costs of 6,010, 6,279, 18,126 and 17,724, respectively
                                                         114,367,500 153,719,000         
      dividend requirements on preferred stock
                                                              1,414,000 1,060,000 1,060,000 1,061,000 1,060,000 
      premium on redemption of preferred stock
                                                              3,260,000     
      earnings available to common shareholders
                                                         140,170,000 398,106,000 183,060,000 183,893,000 140,509,000 333,658,000 157,702,000 202,509,000 135,573,000 311,246,000 
      interest charges — includes other financing costs of 6,036, 6,185, 12,116 and 11,445, respectively
                                                           151,921,000        
      interest charges — includes other financing costs of 6,080 and 5,260, respectively
                                                            151,830,000       
      other operating and maintenance expenses
                                                             393,789,750 532,962,000 532,170,000 510,027,000 550,002,000 509,634,000 
      interest charges — includes other financing costs of 6,279, 5,229, 17,724 and 15,386, respectively
                                                             109,675,750 148,011,000     
      earnings per average common share — basic:
                                                                   
      income from discontinued operations
                                                                   
      earnings per share
                                                             0.29 0.69 0.33  0.29 0.68 
      earnings per average common share — diluted:
                                                                   
      interest charges — includes other financing costs of 6,185, 5,146, 11,445 and 10,157, respectively
                                                               146,338,000    
      interest charges — includes other financing costs of 5,260 and 5,011, respectively
                                                                144,354,000   
      interest charges — includes other financing costs of 5,229, 5,103, 15,386 and 15,255, respectively
                                                                 107,533,500 144,849,000 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 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 
                                                                     
        assets
                                                                     
        current assets
                                                                     
        cash and cash equivalents
      1,760,000,000 274,000,000 1,052,000,000 1,454,000,000 1,123,000,000 179,000,000 1,545,000,000 1,598,000,000 501,000,000 129,000,000 594,000,000 275,000,000 114,000,000 111,000,000 117,000,000 335,000,000 90,000,000 166,000,000 631,000,000 538,000,000 1,039,000,000 129,000,000 885,000,000 1,625,000,000 244,000,000 248,000,000 864,000,000 353,000,000 94,000,000 147,000,000 213,000,000 332,000,000 116,000,000 83,000,000 167,841,000 61,382,000 73,985,000 84,476,000 353,385,000 76,711,000 101,491,000 84,940,000 404,409,000 135,597,000 133,044,000 79,608,000 137,868,000 99,540,000 132,313,000 107,144,000 101,834,000 58,821,000 112,960,000 82,323,000 747,273,000 63,530,000 99,742,000 60,684,000 194,155,000 101,603,000 94,338,000 108,437,000 213,455,000 
        accounts receivable
      1,346,000,000 1,330,000,000 1,246,000,000 1,133,000,000 1,287,000,000 1,249,000,000 1,187,000,000 1,138,000,000 1,220,000,000 1,315,000,000 1,220,000,000 1,111,000,000 1,300,000,000 1,373,000,000 1,196,000,000 1,084,000,000 1,190,000,000 1,018,000,000 1,022,000,000 948,000,000 959,000,000 916,000,000 899,000,000 799,000,000 839,000,000 837,000,000 821,000,000 737,000,000 974,000,000 860,000,000 856,000,000 808,000,000 868,000,000 797,000,000 807,621,000 759,378,000 781,248,000 776,289,000 754,248,000 689,564,000 729,386,000 724,606,000 741,230,000 676,223,000 826,797,000 826,506,000 760,213,000 742,730,000 885,098,000 744,160,000 786,874,000 719,069,000 789,209,000 718,046,000 704,580,000 645,264,000 718,145,000 753,120,000 752,123,000 679,560,000 765,421,000 718,474,000 703,960,000 
        accrued unbilled revenues
      746,000,000 880,000,000 766,000,000 822,000,000 769,000,000 832,000,000 790,000,000 847,000,000 779,000,000 853,000,000 731,000,000 741,000,000 777,000,000 1,105,000,000 793,000,000 792,000,000 716,000,000 862,000,000 656,000,000 699,000,000 591,000,000 714,000,000 586,000,000 613,000,000 561,000,000 713,000,000 623,000,000 639,000,000 662,000,000 755,000,000 650,000,000 648,000,000 605,000,000 764,000,000 625,657,000 608,499,000 555,445,000 729,832,000 567,852,000 589,708,000 525,423,000 654,867,000 546,067,000 582,711,000 544,518,000 728,492,000 574,824,000 609,673,000 575,813,000 687,230,000 575,711,000 626,294,000 586,761,000 663,363,000 521,883,000 549,728,000 491,410,000 688,740,000 552,837,000 590,855,000 550,695,000 708,691,000 534,280,000 
        inventories
      709,000,000 761,000,000 723,000,000 668,000,000 625,000,000 666,000,000 638,000,000 622,000,000 623,000,000 711,000,000 688,000,000 625,000,000 580,000,000 803,000,000 870,000,000 645,000,000 505,000,000 631,000,000 587,000,000 500,000,000 469,000,000 535,000,000 512,000,000 487,000,000 488,000,000 544,000,000 544,000,000 483,000,000 445,000,000 548,000,000 528,000,000 511,000,000 492,000,000 610,000,000 616,675,000 542,044,000 519,081,000 604,226,000 614,908,000 526,785,000 520,054,000 608,584,000 644,963,000 532,703,000 505,213,000 597,183,000 634,262,000 501,270,000 436,237,000 576,538,000 604,628,000 494,890,000 447,709,000 535,574,000 562,721,000 473,137,000 474,359,000 618,232,000 608,007,000 484,772,000 442,205,000 560,800,000 591,725,000 
        regulatory assets
      482,000,000 529,000,000 536,000,000 621,000,000 627,000,000 561,000,000 562,000,000 630,000,000 647,000,000 611,000,000 695,000,000 828,000,000 983,000,000 1,059,000,000 1,275,000,000 1,085,000,000 1,049,000,000 1,106,000,000 1,073,000,000 1,041,000,000 928,000,000 640,000,000 576,000,000 513,000,000 508,000,000 488,000,000 455,000,000 425,000,000 412,000,000 464,000,000 452,000,000 440,000,000 422,000,000 424,000,000 407,639,000 375,020,000 360,309,000 363,655,000 317,611,000 325,690,000 317,489,000 344,630,000 347,122,000 364,746,000 351,780,000 444,058,000 415,197,000 462,185,000 481,473,000 417,801,000 396,271,000 396,308,000 369,206,000 352,977,000 353,807,000 366,226,000 333,053,000 402,235,000 412,211,000 381,457,000 319,486,000 388,541,000 2,324,744,000 
        derivative instruments
      138,000,000 165,000,000 216,000,000 255,000,000 113,000,000 114,000,000 179,000,000 234,000,000 86,000,000 104,000,000 146,000,000 233,000,000 97,000,000 279,000,000 456,000,000 534,000,000 125,000,000 123,000,000 228,000,000 148,000,000 44,000,000 49,000,000 69,000,000 72,000,000 45,000,000 55,000,000 61,000,000 86,000,000 56,000,000 87,000,000 76,000,000 75,000,000 28,000,000 44,000,000 74,533,000 78,487,000 20,885,000 38,224,000 42,860,000 46,953,000 23,293,000 33,842,000 48,110,000 63,603,000 38,905,000 85,723,000 120,654,000 154,940,000 70,275,000 91,707,000 92,687,000 100,215,000 59,554,000 69,013,000 79,988,000 88,368,000 61,971,000 64,340,000 50,281,000 53,832,000 55,932,000 54,079,000  
        prepayments and other
      701,000,000 1,075,000,000 1,142,000,000 652,000,000 749,000,000 652,000,000 504,000,000 541,000,000 548,000,000 294,000,000 257,000,000 322,000,000 359,000,000 360,000,000 329,000,000 316,000,000 307,000,000 289,000,000 235,000,000 221,000,000 244,000,000 250,000,000 232,000,000 208,000,000 230,000,000 185,000,000 193,000,000 175,000,000 191,000,000 154,000,000 157,000,000 164,000,000 188,000,000 183,000,000 143,120,000 135,493,000 145,203,000 138,682,000 122,786,000 126,146,000 154,143,000 155,734,000 142,797,000 141,774,000 155,435,000 171,112,000 270,529,000 270,717,000 295,479,000 252,258,000 236,764,000 264,253,000 246,079,000 171,315,000 174,715,000 195,357,000 192,746,000 121,480,000 191,852,000 186,884,000 184,791,000 193,621,000 296,097,000 
        total current assets
      5,882,000,000 5,014,000,000 5,681,000,000 5,667,000,000 5,368,000,000 4,325,000,000 5,469,000,000 5,699,000,000 4,489,000,000 4,069,000,000 4,402,000,000 4,201,000,000 4,253,000,000 5,144,000,000 5,090,000,000 4,842,000,000 4,022,000,000 4,239,000,000 4,487,000,000 4,147,000,000 4,315,000,000 3,275,000,000 3,837,000,000 4,390,000,000 2,983,000,000 3,113,000,000 3,600,000,000 2,939,000,000 2,909,000,000 3,094,000,000 3,003,000,000 3,056,000,000 2,782,000,000 2,973,000,000 2,898,874,000 2,756,550,000 2,633,154,000 2,842,081,000 3,076,163,000 2,704,099,000 2,732,617,000 2,910,445,000 3,344,422,000 3,048,922,000 3,057,446,000 3,364,380,000 3,196,594,000 3,123,820,000 3,129,346,000 3,218,040,000 3,120,741,000 2,818,200,000 2,704,671,000 2,625,139,000 3,370,844,000 2,560,408,000 2,542,834,000 2,982,564,000 2,861,473,000 2,478,963,000 2,514,129,000 2,732,643,000 2,529,513,000 
        property, plant and equipment
      67,808,000,000 65,639,000,000 63,131,000,000 60,751,000,000 58,807,000,000 57,198,000,000 55,321,000,000 53,890,000,000 52,765,000,000 51,642,000,000 50,613,000,000 49,664,000,000 48,896,000,000 48,253,000,000 47,287,000,000 46,535,000,000 45,837,000,000 45,457,000,000 44,730,000,000 44,141,000,000 43,582,000,000 42,950,000,000 42,227,000,000 41,124,000,000 40,776,000,000 39,483,000,000 38,703,000,000 37,651,000,000 37,114,000,000 36,944,000,000 35,879,000,000 35,289,000,000 34,679,000,000 34,329,000,000 33,949,952,000 33,543,843,000 33,158,384,000 32,841,750,000 32,206,696,000 31,823,282,000 31,433,406,000 31,205,851,000 29,828,609,000 29,350,364,000 28,966,911,000 28,756,916,000 27,630,363,000 27,070,377,000 26,541,482,000 26,122,159,000 25,342,578,000 24,813,411,000 24,219,231,000 23,809,348,000 23,401,597,000 23,047,854,000 22,672,686,000 22,353,367,000 21,729,488,000 21,513,539,000 20,908,333,000 20,663,082,000 19,444,841,000 
        other assets
                                                                     
        nuclear decommissioning fund and other investments
      4,336,000,000 4,389,000,000 4,273,000,000 4,087,000,000 3,888,000,000 3,896,000,000 3,947,000,000 3,791,000,000 3,746,000,000 3,599,000,000 3,393,000,000 3,456,000,000 3,373,000,000 3,234,000,000 3,083,000,000 3,229,000,000 3,492,000,000 3,628,000,000 3,446,000,000 3,389,000,000 3,154,000,000 3,096,000,000 2,813,000,000 2,683,000,000 2,429,000,000 2,731,000,000 2,599,000,000 2,573,000,000 2,504,000,000 2,317,000,000 2,473,000,000 2,398,000,000 2,404,000,000 2,397,000,000 2,300,265,000 2,231,588,000 2,187,946,000 2,091,858,000 2,048,455,000 1,987,474,000 1,917,709,000 1,902,995,000 1,807,692,000 1,880,153,000 1,867,425,000 1,832,640,000 1,816,962,000 1,838,648,000 1,793,067,000 1,755,990,000 1,679,987,000 1,622,978,000 1,663,648,000 1,617,865,000 1,578,381,000 1,522,203,000 1,537,490,000 1,463,515,000 1,399,527,000 1,517,058,000 1,511,278,000 1,476,435,000 1,443,300,000 
        operating lease right-of-use assets
      868,000,000 893,000,000 877,000,000 1,131,000,000 1,077,000,000 1,060,000,000 1,096,000,000 1,145,000,000 1,164,000,000 1,217,000,000 1,114,000,000 1,143,000,000 1,194,000,000 1,204,000,000 1,155,000,000 1,202,000,000 1,239,000,000 1,291,000,000 1,342,000,000 1,390,000,000 1,440,000,000 1,490,000,000 1,534,000,000 1,229,000,000 1,260,000,000 1,672,000,000 1,718,000,000 1,763,000,000 1,619,000,000                                   
        finance lease right-of-use assets
      1,431,000,000 1,348,000,000 1,358,000,000                                                             
        other
      1,417,000,000 1,036,000,000 871,000,000 801,000,000 730,000,000 635,000,000 596,000,000 567,000,000 562,000,000 678,000,000 519,000,000 482,000,000 475,000,000 389,000,000 420,000,000 439,000,000 460,000,000 431,000,000 339,000,000 395,000,000 409,000,000 379,000,000 348,000,000 1,019,000,000 516,000,000 492,000,000 478,000,000 490,000,000 499,000,000 463,000,000 272,000,000 273,000,000 280,000,000 501,000,000 259,117,000 255,470,000 247,351,000 503,953,000 67,716,000 38,415,000 32,998,000 124,420,000 182,058,000 176,172,000 174,608,000 175,957,000 177,365,000 173,509,000 170,064,000 217,241,000 178,169,000 184,150,000 177,076,000 200,008,000 203,506,000 193,566,000 192,157,000 155,926,000 164,495,000 163,817,000 168,473,000 180,044,000 162,473,000 
        total other assets
      11,138,000,000 10,718,000,000 10,342,000,000 8,919,000,000 8,574,000,000 8,512,000,000 8,496,000,000 8,338,000,000 8,331,000,000 8,368,000,000 7,855,000,000 7,793,000,000 7,796,000,000 7,791,000,000 7,598,000,000 7,940,000,000 8,126,000,000 8,155,000,000 8,300,000,000 8,491,000,000 8,614,000,000 7,732,000,000 7,644,000,000 7,942,000,000 7,374,000,000 7,852,000,000 7,937,000,000 7,994,000,000 7,827,000,000 5,949,000,000 5,953,000,000 5,895,000,000 5,698,000,000 5,728,000,000 5,619,968,000 5,560,596,000 5,493,803,000 5,471,446,000 5,041,891,000 4,962,783,000 4,903,821,000 4,937,239,000 4,856,665,000 4,869,523,000 4,854,294,000 4,836,588,000 4,536,484,000 4,523,447,000 4,527,924,000 4,567,291,000 4,663,333,000 4,634,651,000 4,663,773,000 4,706,199,000 4,285,057,000 4,211,881,000 4,237,733,000 4,161,336,000 3,946,893,000 4,010,722,000 4,044,187,000 3,991,965,000 4,327,112,000 
        total assets
      84,828,000,000 81,371,000,000 79,154,000,000 75,337,000,000 72,749,000,000 70,035,000,000 69,286,000,000 67,927,000,000 65,585,000,000 64,079,000,000 62,870,000,000 61,658,000,000 60,945,000,000 61,188,000,000 59,975,000,000 59,317,000,000 57,985,000,000 57,851,000,000 57,517,000,000 56,779,000,000 56,511,000,000 53,957,000,000 53,708,000,000 53,456,000,000 51,133,000,000 50,448,000,000 50,240,000,000 48,584,000,000 47,850,000,000 45,987,000,000 44,835,000,000 44,240,000,000 43,159,000,000 43,030,000,000 42,468,794,000 41,860,989,000 41,285,341,000 41,155,277,000 40,324,750,000 39,490,164,000 39,069,844,000 39,053,535,000 38,029,696,000 37,268,809,000 36,878,651,000 36,957,884,000 35,363,441,000 34,717,644,000 34,198,752,000 33,907,490,000 33,126,652,000 32,266,262,000 31,587,675,000 31,140,686,000 31,057,498,000 29,820,143,000 29,453,253,000 29,497,267,000 28,537,854,000 28,003,224,000 27,466,649,000 27,387,690,000 26,301,466,000 
        liabilities and equity
                                                                     
        current liabilities
                                                                     
        current portion of long-term debt
      1,001,000,000 501,000,000 1,000,000 251,000,000 1,103,000,000 1,103,000,000 1,104,000,000 854,000,000 552,000,000 552,000,000 1,051,000,000 1,051,000,000 901,000,000 1,151,000,000 651,000,000 651,000,000 851,000,000 601,000,000 621,000,000 21,000,000 21,000,000 421,000,000 401,000,000 1,101,000,000 1,102,000,000 702,000,000 853,000,000 553,000,000 2,000,000 406,000,000 556,000,000 856,000,000 457,000,000 457,000,000 305,415,000 505,345,000 755,448,000 255,529,000 709,567,000 710,151,000 656,516,000 657,021,000 457,474,000 707,356,000 257,399,000 257,726,000 257,506,000 7,522,000 282,133,000 280,763,000 280,538,000 282,042,000 6,929,000 258,155,000 859,462,000 1,311,594,000 1,309,681,000 1,059,922,000 462,414,000 53,927,000 54,761,000 55,415,000 414,443,000 
        short-term debt
      1,480,000,000 1,550,000,000 1,330,000,000 820,000,000 719,000,000 695,000,000 95,000,000 802,000,000 463,000,000 785,000,000  544,000,000 1,079,000,000 813,000,000 158,000,000 136,000,000 996,000,000 1,005,000,000 1,747,000,000 1,745,000,000 1,477,000,000 584,000,000 500,000,000 1,410,000,000 1,765,000,000 595,000,000 933,000,000 1,597,000,000 1,252,000,000 1,038,000,000 437,000,000 682,000,000 1,025,000,000 814,000,000 514,000,000 784,000,000 605,000,000 392,000,000 366,000,000 447,000,000 183,000,000 846,000,000 64,000,000 451,000,000 969,000,000 1,019,500,000 697,000,000 777,800,000 765,000,000 759,000,000 302,000,000 354,000,000 425,000,000 602,000,000 304,000,000 481,000,000 339,000,000 219,000,000 50,000,000 656,000,000 531,500,000 466,400,000 40,000,000 
        accounts payable
      2,261,000,000 2,307,000,000 2,328,000,000 2,096,000,000 1,942,000,000 1,781,000,000 1,713,000,000 1,546,000,000 1,461,000,000 1,668,000,000 1,445,000,000 1,307,000,000 1,338,000,000 1,804,000,000 1,586,000,000 1,590,000,000 1,257,000,000 1,409,000,000 1,319,000,000 1,273,000,000 1,213,000,000 1,237,000,000 1,602,000,000 1,188,000,000 996,000,000 1,294,000,000 1,258,000,000 1,057,000,000 1,154,000,000 1,237,000,000 1,189,000,000 1,092,000,000 1,027,000,000 1,243,000,000 992,498,000 973,642,000 861,506,000 1,044,959,000 916,534,000 921,973,000 809,656,000 960,982,000 924,260,000 830,278,000 898,003,000 1,173,006,000 1,061,385,000 967,251,000 1,061,874,000 1,261,238,000 965,572,000 998,607,000 932,547,000 959,093,000 885,099,000 871,069,000 786,187,000 902,078,000 837,259,000 957,521,000 848,568,000 979,750,000 794,381,000 
        regulatory liabilities
      701,000,000 714,000,000 760,000,000 893,000,000 815,000,000 852,000,000 835,000,000 781,000,000 557,000,000 528,000,000 462,000,000 486,000,000 358,000,000 418,000,000 596,000,000 682,000,000 359,000,000 271,000,000 338,000,000 336,000,000 406,000,000 311,000,000 302,000,000 420,000,000 456,000,000 407,000,000 469,000,000 442,000,000 492,000,000 436,000,000 410,000,000 395,000,000 270,000,000 239,000,000 256,191,000 261,171,000 186,926,000 220,894,000 228,721,000 279,755,000 272,647,000 306,830,000 365,853,000 418,618,000 393,054,000 410,729,000 379,824,000 366,579,000 258,946,000 274,769,000 208,943,000 205,112,000 193,658,000 168,858,000 219,464,000 193,509,000 220,526,000 275,095,000 309,032,000 170,655,000 176,511,000 156,038,000 1,236,097,000 
        taxes accrued
      697,000,000 579,000,000 531,000,000 360,000,000 631,000,000 535,000,000 488,000,000 360,000,000 638,000,000 557,000,000 541,000,000 407,000,000 682,000,000 569,000,000 545,000,000 415,000,000 685,000,000 569,000,000 553,000,000 428,000,000 684,000,000 578,000,000 504,000,000 343,000,000 553,000,000 466,000,000 443,000,000 342,000,000 555,000,000 450,000,000 428,000,000 316,000,000 544,000,000 448,000,000 427,275,000 339,966,000 544,177,000 457,392,000 422,437,000 330,398,000 525,934,000 438,189,000 379,103,000 280,838,000 480,311,000 396,615,000 371,959,000 269,020,000 461,520,000 378,766,000 335,846,000 242,339,000 415,081,000 334,441,000 264,792,000 215,159,000 359,064,000 289,713,000 250,135,000 189,564,000 312,669,000 254,320,000 224,483,000 
        accrued interest
      419,000,000 337,000,000 410,000,000 319,000,000 330,000,000 280,000,000 329,000,000 299,000,000 291,000,000 251,000,000 288,000,000 233,000,000 242,000,000 217,000,000 244,000,000 219,000,000 209,000,000 209,000,000 206,000,000 207,000,000 191,000,000 203,000,000 186,000,000 200,000,000 167,000,000 192,000,000 166,000,000 180,000,000 159,000,000 174,000,000 158,000,000 176,000,000 147,000,000 174,000,000 147,860,000 175,849,000 151,929,000 172,901,000 155,005,000 169,309,000 148,112,000 166,829,000 143,124,000 160,146,000 131,579,000 158,536,000 132,084,000 158,663,000 132,589,000 159,372,000 134,612,000 156,751,000 135,532,000 162,494,000 160,621,000 176,855,000 161,930,000 177,111,000 162,374,000 165,313,000 158,230,000 163,907,000 161,553,000 
        dividends payable
      370,000,000 355,000,000 337,000,000 337,000,000 328,000,000 314,000,000 312,000,000 305,000,000 304,000,000 289,000,000 287,000,000 287,000,000 286,000,000 268,000,000 267,000,000 266,000,000 265,000,000 249,000,000 246,000,000 246,000,000 246,000,000 231,000,000 226,000,000 226,000,000 226,000,000 212,000,000 212,000,000 209,000,000 208,000,000 195,000,000 194,000,000 193,000,000 193,000,000 183,000,000 182,795,000 182,795,000 182,795,000 172,456,000 172,704,000 172,704,000 172,704,000 162,410,000 162,324,000 162,224,000 162,130,000 151,720,000 151,623,000 151,097,000 150,250,000 139,432,000 139,333,000 139,240,000 133,238,000 131,748,000 131,653,000 131,565,000 126,601,000 126,487,000 127,497,000 127,040,000 123,310,000 122,847,000 117,236,000 
        operating lease liabilities
      111,000,000 110,000,000 114,000,000 211,000,000 219,000,000 227,000,000 226,000,000 226,000,000 228,000,000 226,000,000 231,000,000 226,000,000 224,000,000 217,000,000 211,000,000 210,000,000 203,000,000 205,000,000 218,000,000 220,000,000 221,000,000 214,000,000 208,000,000 149,000,000 143,000,000 1,549,000,000 1,598,000,000 1,647,000,000 1,529,000,000                                   
        total current liabilities
      7,636,000,000 7,089,000,000 7,148,000,000 5,886,000,000 6,741,000,000 6,459,000,000 5,858,000,000 5,900,000,000 5,210,000,000 5,652,000,000 5,073,000,000 5,231,000,000 5,661,000,000 6,078,000,000 4,903,000,000 4,865,000,000 5,352,000,000 5,046,000,000 5,764,000,000 4,950,000,000 4,877,000,000 4,239,000,000 4,393,000,000 5,473,000,000 5,839,000,000 4,568,000,000 5,021,000,000 5,060,000,000 4,424,000,000 4,460,000,000 3,838,000,000 4,178,000,000 4,122,000,000 4,088,000,000 3,340,406,000 3,690,704,000 3,707,976,000 3,247,043,000 3,453,972,000 3,506,381,000 3,188,568,000 4,058,297,000 3,085,020,000 3,537,251,000 3,774,528,000 4,064,583,000 3,470,869,000 3,059,929,000 3,467,748,000 3,654,498,000 2,839,061,000 2,696,810,000 2,526,517,000 2,937,073,000 3,160,534,000 3,831,222,000 3,708,042,000 3,588,639,000 2,653,183,000 2,638,759,000 2,484,756,000 2,536,533,000 2,199,484,000 
        deferred credits and other liabilities
                                                                     
        deferred income taxes
      5,918,000,000 6,004,000,000 5,927,000,000 5,739,000,000 5,368,000,000 5,319,000,000 5,480,000,000 5,280,000,000 5,108,000,000 4,885,000,000 4,702,000,000 4,657,000,000 4,729,000,000 4,756,000,000 4,762,000,000 4,708,000,000 4,822,000,000 4,894,000,000 4,913,000,000 4,807,000,000 4,765,000,000 4,746,000,000 4,696,000,000 4,569,000,000 4,492,000,000 4,509,000,000 4,427,000,000 4,319,000,000 4,255,000,000 4,165,000,000 4,119,000,000 3,973,000,000 3,905,000,000 3,845,000,000 7,362,931,000 7,130,715,000 6,999,546,000 6,784,319,000 195,303,000 206,644,000 180,513,000 140,219,000 352,712,000 429,860,000 383,463,000 246,210,000 283,047,000 282,765,000 252,658,000 341,202,000 325,972,000 158,350,000 93,193,000 32,528,000 225,877,000 178,470,000 162,353,000 178,446,000 3,809,638,000 3,665,418,000 3,567,061,000  3,616,378,000 
        asset retirement obligations
      3,937,000,000 3,888,000,000 3,853,000,000 3,803,000,000 3,756,000,000 3,713,000,000 3,431,000,000 3,390,000,000 3,255,000,000 3,218,000,000 3,332,000,000 3,295,000,000 3,423,000,000 3,380,000,000 3,296,000,000 3,271,000,000 3,210,000,000 3,151,000,000 3,094,000,000 3,059,000,000 2,980,000,000 2,884,000,000 2,942,000,000 2,881,000,000 2,734,000,000 2,701,000,000 2,679,000,000 2,647,000,000 2,599,000,000 2,568,000,000 2,572,000,000 2,534,000,000 2,504,000,000 2,475,000,000 2,883,799,000 2,849,532,000 2,815,677,000 2,782,229,000 2,703,396,000 2,671,320,000 2,639,628,000 2,608,562,000 2,550,930,000 2,517,668,000 2,476,049,000 2,446,631,000 1,922,022,000 1,897,942,000 1,838,521,000 1,815,390,000 1,785,319,000 1,762,959,000 1,741,707,000 1,719,796,000 1,716,612,000 1,695,560,000 1,662,175,000 1,651,793,000 1,293,424,000 1,277,785,000 985,466,000 969,310,000 920,129,000 
        customer advances
      128,000,000 129,000,000 130,000,000 132,000,000 139,000,000 146,000,000 154,000,000 154,000,000 159,000,000 167,000,000 173,000,000 174,000,000 180,000,000 181,000,000 187,000,000 184,000,000 192,000,000 196,000,000 199,000,000 196,000,000 195,000,000 197,000,000 201,000,000 201,000,000 202,000,000 203,000,000 203,000,000 198,000,000 200,000,000 199,000,000 200,000,000 202,000,000 200,000,000 193,000,000 190,995,000 190,640,000 189,984,000 195,214,000 216,978,000 212,565,000 221,683,000 228,999,000 228,479,000 241,546,000 253,895,000 256,945,000 262,734,000 268,690,000 272,583,000 275,555,000 266,676,000 261,684,000 259,200,000 252,888,000 252,879,000 244,922,000 247,224,000 248,345,000 256,764,000 258,161,000 265,213,000 269,087,000 274,310,000 
        pension and employee benefit obligations
      289,000,000 365,000,000 372,000,000 360,000,000 352,000,000 477,000,000 374,000,000 371,000,000 364,000,000 469,000,000 355,000,000 353,000,000 345,000,000 390,000,000 255,000,000 259,000,000 262,000,000 306,000,000 515,000,000 521,000,000 516,000,000 666,000,000 651,000,000 636,000,000 622,000,000 785,000,000 856,000,000 850,000,000 838,000,000 994,000,000 909,000,000 884,000,000 884,000,000 1,042,000,000 984,794,000 975,606,000 964,398,000 1,112,366,000 843,739,000 825,614,000 812,998,000 941,002,000 863,645,000 858,450,000 850,826,000 936,907,000 653,599,000 650,596,000 642,126,000 769,222,000 998,212,000 988,773,000 979,520,000 1,163,265,000 810,057,000 826,413,000 813,792,000 1,001,906,000 829,364,000 828,500,000 824,500,000 962,767,000 830,286,000 
        finance lease liabilities
      1,298,000,000 1,262,000,000 1,272,000,000                                                             
        total deferred credits and other liabilities
      18,834,000,000 18,841,000,000 18,791,000,000 17,391,000,000 16,808,000,000 16,738,000,000 16,605,000,000 16,357,000,000 16,138,000,000 15,898,000,000 15,578,000,000 15,498,000,000 15,648,000,000 15,622,000,000 15,379,000,000 15,276,000,000 15,367,000,000 15,414,000,000 15,603,000,000 15,561,000,000 15,464,000,000 15,498,000,000 15,578,000,000 15,135,000,000 14,982,000,000 15,234,000,000 15,259,000,000 15,162,000,000 14,979,000,000 13,502,000,000 13,324,000,000 13,101,000,000 12,954,000,000 12,967,000,000 13,116,044,000 12,955,297,000 12,810,793,000 12,692,667,000 12,480,253,000 12,175,879,000 12,061,247,000 11,903,599,000 11,709,095,000 11,566,366,000 11,389,783,000 11,179,185,000 10,236,192,000 9,984,165,000 9,778,261,000 9,776,288,000 9,826,032,000 9,452,730,000 9,264,036,000 9,185,631,000 8,940,854,000 8,709,013,000 8,609,177,000 8,577,917,000 7,898,231,000 7,761,364,000 7,431,307,000 7,399,514,000 7,526,566,000 
        commitments and contingencies
                                                                     
        capitalization
                                                                     
        long-term debt
      34,552,000,000 31,832,000,000 32,034,000,000 31,099,000,000 29,396,000,000 27,316,000,000 27,471,000,000 27,716,000,000 26,396,000,000 24,913,000,000 24,910,000,000 24,015,000,000 22,818,000,000 22,813,000,000 23,309,000,000 23,205,000,000 21,534,000,000 21,779,000,000 20,979,000,000 21,476,000,000 21,470,000,000 19,645,000,000 19,960,000,000 19,463,000,000 17,010,000,000 17,407,000,000 16,819,000,000 15,996,000,000 16,118,000,000 15,803,000,000 15,508,000,000 15,311,000,000 14,522,000,000 14,520,000,000 14,572,967,000 14,091,833,000 13,696,461,000 14,194,718,000 13,402,583,000 13,104,770,000 13,148,395,000 12,490,719,000 12,690,751,000 11,896,126,000 11,499,470,000 11,499,634,000 11,501,720,000 11,752,778,000 11,205,319,000 10,910,754,000 10,914,273,000 10,816,477,000 10,642,009,000 10,143,905,000 10,105,947,000 8,706,403,000 8,598,363,000 8,848,513,000 9,450,157,000 9,263,556,000 9,264,123,000 9,263,144,000 8,864,759,000 
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 624,162,780 and 623,600,715 shares outstanding at march 31, 2026 and december 31, 2025, respectively
      1,560,000,000                                                               
        additional paid in capital
      12,914,000,000 12,906,000,000 10,772,000,000 10,736,000,000 9,729,000,000 9,601,000,000 9,577,000,000 8,589,000,000 8,481,000,000 8,465,000,000 8,269,000,000 8,247,000,000 8,169,000,000 8,155,000,000 7,979,000,000 7,960,000,000 7,801,000,000 7,803,000,000 7,443,000,000 7,435,000,000 7,411,000,000 7,404,000,000 6,694,000,000 6,679,000,000 6,659,000,000 6,656,000,000 6,636,000,000 6,190,000,000 6,173,000,000 6,168,000,000 6,125,000,000 5,920,000,000 5,903,000,000 5,898,000,000 5,888,729,000 5,881,475,000 5,872,933,000 5,881,494,000 5,898,896,000 5,896,394,000 5,889,939,000 5,889,106,000 5,873,440,000 5,863,209,000 5,844,995,000 5,837,330,000 5,815,714,000 5,799,968,000 5,681,150,000 5,619,313,000 5,615,716,000 5,595,906,000 5,515,513,000 5,353,015,000 5,334,715,000 5,316,658,000 5,298,572,000 5,327,443,000 5,280,463,000 5,261,687,000 5,241,533,000 5,229,075,000  
        retained earnings
      9,391,000,000 9,207,000,000 8,995,000,000 8,813,000,000 8,706,000,000 8,553,000,000 8,406,000,000 8,039,000,000 8,042,000,000 7,858,000,000 7,739,000,000 7,371,000,000 7,370,000,000 7,239,000,000 7,128,000,000 6,747,000,000 6,686,000,000 6,572,000,000 6,508,000,000 6,146,000,000 6,082,000,000 5,968,000,000 5,912,000,000 5,538,000,000 5,478,000,000 5,413,000,000 5,336,000,000 5,024,000,000 4,996,000,000 4,893,000,000 4,876,000,000 4,580,000,000 4,510,000,000 4,413,000,000 4,386,050,000 4,079,068,000 4,036,352,000 3,981,652,000 3,924,125,000 3,643,653,000 3,620,421,000 3,552,728,000 3,506,861,000 3,243,645,000 3,209,904,000 3,220,958,000 3,177,387,000 2,961,406,000 2,918,215,000 2,807,983,000 2,797,486,000 2,572,935,000 2,516,332,000 2,413,816,000 2,406,016,000 2,140,639,000 2,089,275,000 2,032,556,000 2,019,440,000 1,812,505,000 1,781,386,000 1,701,703,000  
        accumulated other comprehensive loss
      -59,000,000 -63,000,000 -65,000,000 -66,000,000 -72,000,000 -68,000,000 -66,000,000 -67,000,000 -71,000,000 -94,000,000 -78,000,000 -82,000,000 -97,000,000 -93,000,000 -91,000,000 -103,000,000 -116,000,000 -123,000,000 -126,000,000 -135,000,000 -138,000,000 -141,000,000 -143,000,000 -145,000,000 -148,000,000 -141,000,000 -142,000,000 -135,000,000 -127,000,000 -124,000,000 -119,000,000 -122,000,000 -124,000,000 -125,000,000 -104,809,000 -106,795,000 -108,581,000 -110,354,000 -104,961,000 -106,795,000 -108,608,000 -109,753,000 -103,639,000 -105,186,000 -106,688,000 -108,139,000 -102,001,000 -103,366,000 -104,820,000 -106,275,000 -109,980,000 -111,835,000 -113,620,000 -112,653,000 -109,600,000 -102,006,000 -67,515,000 -94,035,000 -80,969,000 -50,983,000 -51,847,000 -53,093,000  
        total common stockholders’ equity
      23,806,000,000 23,609,000,000 21,181,000,000 20,961,000,000 19,804,000,000 19,522,000,000 19,352,000,000 17,954,000,000 17,841,000,000 17,616,000,000 17,309,000,000 16,914,000,000 16,818,000,000 16,675,000,000 16,384,000,000 15,971,000,000 15,732,000,000 15,612,000,000 15,171,000,000 14,792,000,000 14,700,000,000 14,575,000,000 13,777,000,000 13,385,000,000 13,302,000,000 13,239,000,000 13,141,000,000 12,366,000,000 12,329,000,000 12,222,000,000 12,165,000,000 11,650,000,000 11,561,000,000 11,455,000,000 11,439,377,000 11,123,155,000 11,070,111,000 11,020,849,000 10,987,942,000 10,703,134,000 10,671,634,000 10,600,920,000 10,544,830,000 10,269,066,000 10,214,870,000 10,214,482,000 10,154,660,000 9,920,772,000 9,747,424,000 9,565,950,000 9,547,286,000 9,300,245,000 9,155,113,000 8,874,077,000  8,573,505,000 8,537,671,000 8,482,198,000    8,083,519,000  
        total liabilities and equity
      84,828,000,000 81,371,000,000 79,154,000,000 75,337,000,000 72,749,000,000 70,035,000,000 69,286,000,000 67,927,000,000 65,585,000,000 64,079,000,000 62,870,000,000 61,658,000,000 60,945,000,000 61,188,000,000 59,975,000,000 59,317,000,000 57,985,000,000 57,851,000,000 57,517,000,000 56,779,000,000 56,511,000,000 53,957,000,000 53,708,000,000 53,456,000,000 51,133,000,000 50,448,000,000 50,240,000,000 48,584,000,000 47,850,000,000 45,987,000,000 44,835,000,000 44,240,000,000 43,159,000,000 43,030,000,000 42,468,794,000 41,860,989,000 41,285,341,000 41,155,277,000 40,324,750,000 39,490,164,000 39,069,844,000 39,053,535,000 38,029,696,000 37,268,809,000 36,878,651,000 36,957,884,000 35,363,441,000 34,717,644,000 34,198,752,000 33,907,490,000 33,126,652,000 32,266,262,000 31,587,675,000 31,140,686,000 31,057,498,000 29,820,143,000 29,453,253,000 29,497,267,000 28,537,854,000 28,003,224,000 27,466,649,000 27,387,690,000 26,301,466,000 
        see notes to consolidated financial statements
                                                                     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 623,600,715 and 574,365,598 shares outstanding at dec. 31, 2025 and dec. 31, 2024, respectively
       1,559,000,000                                                              
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 591,432,101 and 574,365,598 shares outstanding at sept. 30, 2025 and december 31, 2024, respectively
        1,479,000,000                                                             
        prepaid taxes
         62,000,000 75,000,000 72,000,000 64,000,000 89,000,000 85,000,000 52,000,000 71,000,000 66,000,000 43,000,000 54,000,000 54,000,000 51,000,000 40,000,000 44,000,000 55,000,000 52,000,000 41,000,000 42,000,000 78,000,000 73,000,000 68,000,000 43,000,000 39,000,000 41,000,000 75,000,000 79,000,000 71,000,000 78,000,000 63,000,000 68,000,000 55,788,000 196,247,000 176,998,000 106,697,000 107,210,000 115,898,000 180,825,000 163,023,000 117,012,000 121,705,000 118,291,000 185,488,000                  
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 591,201,845 and 574,365,598 shares outstanding at june 30, 2025 and december 31, 2024, respectively
         1,478,000,000                                                            
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 576,547,051 and 574,365,598 shares outstanding at march 31, 2025 and december 31, 2024, respectively
          1,441,000,000                                                           
        deferred investment tax credits
           40,000,000 41,000,000 56,000,000 58,000,000 60,000,000 45,000,000 46,000,000 47,000,000 48,000,000 50,000,000 51,000,000 52,000,000 53,000,000    45,000,000 46,000,000 47,000,000 48,000,000 49,000,000 50,000,000 51,000,000 52,000,000 54,000,000 54,000,000 56,000,000 57,000,000 58,000,000 59,381,000 60,659,000 61,937,000 63,216,000 64,499,000 65,806,000 67,112,000 68,419,000 69,545,000 70,928,000 72,312,000 73,696,000 74,910,000 76,353,000 77,796,000 79,239,000 79,609,000 80,587,000 81,674,000 82,761,000 83,971,000 84,895,000 85,819,000 86,743,000 88,197,000 89,777,000 91,357,000 92,937,000 94,508,000 
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 574,365,598 and 554,941,703 shares outstanding at dec. 31, 2024 and dec. 31, 2023, respectively
           1,436,000,000                                                          
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 574,101,713 and 554,941,703 shares outstanding at sept. 30, 2024 and december 31, 2023, respectively
            1,435,000,000                                                         
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 557,337,051 and 554,941,703 shares outstanding at june 30, 2024 and december 31, 2023, respectively
             1,393,000,000                                                        
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 555,470,302 and 554,941,703 shares outstanding at march 31, 2024 and december 31, 2023, respectively
              1,389,000,000                                                       
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 554,941,703 and 549,578,018 shares outstanding at dec. 31, 2023 and dec. 31, 2022, respectively
               1,387,000,000                                                      
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 551,662,803 and 549,578,018 shares outstanding at sept. 30, 2023 and december 31, 2022, respectively
                1,379,000,000                                                     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 551,375,255 and 549,578,018 shares outstanding at june 30, 2023 and december 31, 2022, respectively
                 1,378,000,000                                                    
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 550,222,192 and 549,578,018 shares outstanding at march 31, 2023 and december 31, 2022, respectively
                  1,376,000,000                                                   
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 549,578,018 and 544,025,269 shares outstanding at dec. 31, 2022 and dec. 31, 2021, respectively
                   1,374,000,000                                                  
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 547,006,076 and 544,025,269 shares outstanding at sept. 30, 2022 and dec. 31, 2021, respectively
                    1,368,000,000                                                 
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 546,807,793 and 544,025,269 shares outstanding at june 30, 2022 and dec. 31, 2021, respectively
                     1,367,000,000                                                
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 544,530,987 and 544,025,269 shares outstanding at march 31, 2022 and dec. 31, 2021, respectively
                      1,361,000,000                                               
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 544,025,269 and 537,438,394 shares outstanding at dec. 31, 2021 and dec. 31, 2020, respectively
                       1,360,000,000                                              
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 538,458,952 and 537,438,394 shares outstanding at sept. 30, 2021 and dec. 31, 2020, respectively
                        1,346,000,000                                             
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 538,305,927 and 537,438,394 shares outstanding at june 30, 2021 and dec. 31, 2020, respectively
                         1,346,000,000                                            
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 538,076,662 and 537,438,394 shares outstanding at march 31, 2021 and dec. 31, 2020, respectively
                          1,345,000,000                                           
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 537,438,394 and 524,539,000 shares outstanding at dec. 31, 2020 and dec. 31, 2019, respectively
                           1,344,000,000                                          
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 525,452,824 and 524,539,000 shares outstanding at sept. 30, 2020 and dec. 31, 2019, respectively
                            1,314,000,000                                         
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 525,204,978and 524,539,000 shares outstanding at june 30, 2020 and dec. 31, 2019, respectively
                             1,313,000,000                                        
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 525,033,594and 524,539,000 shares outstanding at march 31, 2020 and dec. 31, 2019, respectively
                              1,313,000,000                                       
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 524,539,000 and 514,036,787 shares outstanding at dec. 31, 2019 and 2018, respectively
                               1,311,000,000                                      
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 524,384,030and 514,036,787 shares outstanding at sept. 30, 2019 and dec. 31, 2018, respectively
                                1,311,000,000                                     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 514,865,476and 514,036,787 shares outstanding at june 30, 2019 and dec. 31, 2018, respectively
                                 1,287,000,000                                    
        common stock — 1,000,000,000 shares authorized of 2.50 par value; and 514,667,625514,036,787 shares outstanding at march 31, 2019 and dec. 31, 2018, respectively
                                  1,287,000,000                                   
        deposits and other
                                   272,000,000    278,000,000    248,532,000                          
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 514,036,787 and 507,762,881 shares outstanding at dec. 31, 2018 and 2017, respectively
                                   1,285,000,000                                  
        common stock — 1,000,000,000 shares authorized of 2.50 par value; and 513,298,952507,762,881 shares outstanding at sept. 30, 2018 and dec. 31, 2017, respectively
                                    1,283,000,000                                 
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 508,898,420 and 507,762,881 shares outstanding at june 30, 2018 and dec. 31, 2017, respectively
                                     1,272,000,000                                
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 508,661,859 and 507,762,881 shares outstanding at march 31, 2018 and dec. 31, 2017, respectively
                                      1,272,000,000                               
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,762,881 and 507,222,795 shares outstanding at dec. 31, 2017 and 2016, respectively
                                       1,269,000,000                              
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,762,881 and 507,222,795 shares outstanding at sept. 30, 2017 and dec. 31, 2016, respectively
                                        1,269,407,000                             
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,762,881 and 507,222,795 shares outstanding at june 30, 2017 and dec. 31, 2016, respectively
                                         1,269,407,000                            
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,762,881 and 507,222,795 shares outstanding at march 31, 2017 and dec. 31, 2016, respectively
                                          1,269,407,000                           
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,222,795 and 507,535,523 shares outstanding at dec. 31, 2016 and 2015, respectively
                                           1,268,057,000                          
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,952,795 and 507,535,523 shares outstanding at sept. 30, 2016 and dec. 31, 2015, respectively
                                            1,269,882,000                         
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,952,795 and 507,535,523 shares outstanding at june 30, 2016 and dec. 31, 2015, respectively
                                             1,269,882,000                        
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,952,795 and 507,535,523 shares outstanding at march 31, 2016 and dec. 31, 2015, respectively
                                              1,269,882,000                       
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,535,523 and 505,733,267 shares outstanding at dec. 31, 2015 and 2014, respectively
                                               1,268,839,000                      
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 507,267,264 and 505,733,267 shares outstanding at sept. 30, 2015 and dec. 31, 2014, respectively
                                                1,268,168,000                     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 506,959,395 and 505,733,267 shares outstanding at june 30, 2015 and dec. 31, 2014, respectively
                                                 1,267,398,000                    
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 506,663,770 and 505,733,267 shares outstanding at march 31, 2015 and dec. 31, 2014, respectively
                                                  1,266,659,000                   
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 505,733,267 and 497,971,508 shares outstanding at dec. 31, 2014 and 2013, respectively
                                                   1,264,333,000                  
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 505,424,067 and 497,971,508 shares outstanding at sept. 30, 2014 and dec. 31, 2013, respectively
                                                    1,263,560,000                 
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 505,105,562 and 497,971,508 shares outstanding at june 30, 2014 and dec. 31, 2013, respectively
                                                     1,262,764,000                
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 501,151,619 and 497,971,508 shares outstanding at march 31, 2014 and dec. 31, 2013, respectively
                                                      1,252,879,000               
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 497,971,508 and 487,959,516 shares outstanding at dec. 31, 2013 and 2012, respectively
                                                       1,244,929,000              
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 497,625,709 and 487,959,516 shares outstanding at sept. 30, 2013 and dec. 31, 2012, respectively
                                                        1,244,064,000             
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 497,295,719 and 487,959,516 shares outstanding at june 30, 2013 and dec. 31, 2012, respectively
                                                         1,243,239,000            
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 494,755,061 and 487,959,516 shares outstanding at march 31, 2013 and dec. 31, 2012, respectively
                                                          1,236,888,000           
        restricted cash
                                                             328,000 9,055,000 95,287,000 100,007,000     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 487,959,516 and
                                                                     
        486,493,933 shares outstanding at dec. 31, 2012 and dec. 31, 2011, respectively
                                                           1,219,899,000          
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 487,612,881 and 486,493,933 shares outstanding at sept. 30, 2012 and dec. 31, 2011, respectively
                                                            1,219,032,000         
        total common stockholders' equity
                                                            8,850,163,000    8,431,303,000 8,234,565,000 8,181,483,000   
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 487,285,506 and 486,493,933 shares outstanding at june 30, 2012 and dec. 31, 2011, respectively
                                                             1,218,214,000        
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 486,935,997 and 486,493,933 shares outstanding at march 31, 2012 and dec. 31, 2011, respectively
                                                              1,217,339,000       
        preferred stock — 7,000,000 shares authorized of 100 par value; no shares and 1,049,800 shares outstanding at dec. 31, 2011 and dec. 31, 2010, respectively
                                                                     
        common stock — 1,000,000,000 shares authorized of 2.50 par value; 486,493,933 and 482,333,750 shares outstanding at dec. 31, 2011 and dec. 31, 2010, respectively
                                                               1,216,234,000      
        commitments and contingent liabilities
                                                                     
        preferred stockholders' equity
                                                                104,980,000 104,980,000 104,980,000   
        common stock – 2.50 par value per share
                                                                1,212,369,000 1,211,356,000 1,210,411,000   
        merricourt deposit
                                                                  101,261,000   
        preferred stockholders’ equity
                                                                   104,980,000  
        common stock — 2.50 par value per share
                                                                   1,205,834,000  
        recoverable purchased natural gas and electric energy costs
                                                                    27,974,000 
        derivative instruments valuation
                                                                    65,573,000 
        current assets related to discontinued operations
                                                                    96,449,000 
        noncurrent assets related to discontinued operations
                                                                    134,847,000 
        current liabilities related to discontinued operations
                                                                    9,185,000 
        noncurrent liabilities related to discontinued operations
                                                                    3,760,000 
        preferred stockholders’ equity – authorized 7,000,000 shares of 100 par value; outstanding shares: 1,049,800
                                                                    104,980,000 
        common stockholders’ equity – authorized 1,000,000,000 shares of 2.50 par value; outstanding shares: sept. 30, 2010 – 460,104,538; dec. 31, 2009 – 457,509,263
                                                                    7,605,677,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 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 
                                                                      
          operating activities
                                                                      
          net income
        556,000,000 567,000,000 524,000,000 444,000,000 483,000,000 464,000,000 682,000,000 302,000,000 488,000,000 409,000,000 656,000,000 288,000,000 418,000,000 379,000,000 649,000,000 328,000,000 380,000,000 315,000,000 609,000,000 311,000,000 362,000,000 288,000,000 603,000,000 287,000,000 295,000,000 292,000,000 527,000,000 238,000,000 315,000,000 214,000,000 491,000,000 265,000,000 291,000,000 189,326,000 492,141,000 227,256,000 239,277,000 227,477,000 457,795,000 196,795,000 241,312,000 209,025,000 426,463,000 196,931,000 152,066,000 196,339,000 368,582,000 195,164,000 261,221,000 150,055,000 364,752,000 196,857,000 236,570,000 140,170,000 398,106,000 183,060,000 183,893,000 140,509,000 338,332,000 158,762,000 203,569,000 136,634,000 
          adjustments to reconcile net income to cash from operating activities:
                                                                      
          depreciation and amortization
        767,000,000 752,000,000 755,000,000 727,000,000 734,000,000 714,000,000 685,000,000 706,000,000 664,000,000 647,000,000 622,000,000 571,000,000 631,000,000 615,000,000 611,000,000 643,000,000 567,000,000 546,000,000 554,000,000 526,000,000 517,000,000 500,000,000 517,000,000 476,000,000 466,000,000 453,000,000 451,000,000 443,000,000 438,000,000 446,000,000 444,000,000 382,000,000 387,000,000 381,582,000 375,138,000 369,400,000 368,880,000 336,070,000 332,346,000 326,575,000 323,761,000 301,606,000 284,940,000 279,032,000 277,388,000 266,809,000 259,792,000 259,571,000 250,343,000 261,220,000 232,965,000 254,654,000 253,004,000 236,072,000 243,513,000 231,020,000 233,097,000 198,917,000 246,923,000 233,796,000 229,217,000 224,097,000 
          nuclear fuel amortization
        27,000,000 27,000,000 32,000,000 26,000,000 29,000,000 21,000,000 32,000,000 33,000,000 20,000,000 12,000,000 31,000,000 24,000,000 29,000,000 27,000,000 30,000,000 31,000,000 30,000,000 28,000,000 30,000,000 26,000,000 30,000,000 29,000,000 29,000,000 32,000,000 33,000,000 30,000,000 31,000,000 27,000,000 31,000,000 30,000,000 30,000,000 31,000,000 31,000,000 26,346,000 30,651,000 26,151,000 30,852,000 27,507,000 31,208,000 32,517,000 25,750,000 23,797,000 33,173,000 20,989,000 28,465,000 22,264,000 31,812,000 31,604,000 28,862,000 21,642,000 26,962,000 21,963,000 27,522,000 23,480,000 29,406,000 23,765,000 26,000,000 25,610,000 31,560,000 18,181,000 25,551,000 27,219,000 
          deferred income taxes
        -5,000,000 19,000,000 113,000,000 269,000,000 13,000,000 -181,000,000 121,000,000 131,000,000 154,000,000 114,000,000 19,000,000 -119,000,000 -73,000,000 -55,000,000 50,000,000 -80,000,000 -55,000,000 -70,000,000 58,000,000 -44,000,000 -23,000,000 -53,000,000   34,000,000 13,000,000 83,000,000 21,000,000 26,000,000 34,000,000 74,000,000 51,000,000 59,000,000 138,987,000 191,774,000 115,499,000 193,740,000 107,550,000 226,211,000 92,510,000 160,379,000 106,777,000 237,927,000 108,391,000 82,773,000 136,154,000 196,745,000 86,015,000 150,464,000 105,400,000 173,978,000 105,022,000 130,662,000 67,681,000 162,055,000 110,932,000 167,426,000 77,212,000 191,718,000 82,785,000 114,852,000 114,888,000 
          allowance for equity funds used during construction
        -92,000,000 -85,000,000 -79,000,000 -69,000,000 -48,000,000 -49,000,000 -44,000,000 -38,000,000 -37,000,000 -28,000,000 -26,000,000 -18,000,000 -19,000,000 -22,000,000 -20,000,000 -20,000,000 -13,000,000 -20,000,000 -21,000,000 -18,000,000 -14,000,000 -24,000,000 -30,000,000 -38,000,000 -23,000,000 -22,000,000 -15,000,000 -20,000,000 -20,000,000 -29,000,000 -30,000,000 -26,000,000 -23,000,000 -20,818,000 -23,483,000 -16,386,000 -14,313,000 -15,505,000 -17,199,000 -14,730,000 -13,113,000 -15,208,000 -15,427,000 -12,641,000 -12,660,000 -20,898,000 -23,337,000 -23,608,000 -21,907,000 -24,536,000 -21,284,000 -22,109,000 -19,754,000 -18,336,000 -15,860,000 -15,194,000 -13,450,000 -12,533,000 -11,840,000 -13,606,000 -13,244,000 -16,402,000 
          (earnings) loss from equity method investments
        -13,000,000                                                              
          dividends from equity method investments
        7,000,000 16,000,000 8,000,000 8,000,000 8,000,000 8,000,000 9,000,000 9,000,000 9,000,000 8,000,000 9,000,000 9,000,000 7,000,000 10,000,000 10,000,000 10,000,000 11,000,000 10,000,000                                            
          provision for bad debts
        13,000,000 14,000,000 16,000,000 12,000,000 19,000,000 19,000,000 11,000,000 17,000,000 21,000,000 22,000,000 13,000,000 23,000,000 32,000,000 11,000,000 13,000,000 17,000,000 7,000,000 26,000,000 13,000,000 14,000,000 21,000,000 13,000,000                                        
          share-based compensation expense
        11,000,000 8,000,000 17,000,000 12,000,000 9,000,000 6,000,000 10,000,000 11,000,000 6,000,000 8,000,000 5,000,000 3,000,000 9,000,000 1,000,000 5,000,000 10,000,000 4,000,000 11,000,000 -1,000,000 12,000,000 9,000,000 13,000,000 19,000,000 15,000,000 26,000,000 11,000,000 12,000,000 16,000,000 19,000,000 20,000,000 15,000,000 4,000,000 6,000,000 12,761,000 12,347,000 13,939,000 17,953,000 11,298,000 5,418,000 11,355,000 13,099,000 15,163,000 8,345,000 11,195,000 10,225,000 15,653,000 5,546,000 5,620,000 5,370,000 -3,749,000 9,615,000 10,580,000 8,167,000 6,084,000 3,637,000 13,366,000 3,883,000 13,063,000 11,644,000 10,404,000 9,895,000 8,535,000 
          changes in operating assets and liabilities:
                                                                      
          accounts receivable
        -30,000,000 -97,000,000 -117,000,000 143,000,000 -58,000,000 -62,000,000 -67,000,000 70,000,000 78,000,000 -122,000,000 -130,000,000 175,000,000 50,000,000 -208,000,000 -124,000,000 94,000,000 -191,000,000 -12,000,000 -89,000,000 -6,000,000 -57,000,000 -46,000,000 -127,000,000 12,000,000 7,000,000 -59,000,000 -83,000,000 236,000,000 -114,000,000 -57,000,000 -37,000,000 60,000,000 -71,000,000 -28,663,000 -48,243,000 21,865,000 -4,959,000 -53,585,000 -64,627,000 39,822,000 -4,780,000 -19,450,000 -65,007,000 150,574,000 -291,000 -109,066,000 -17,486,000 142,368,000 -140,962,000 -423,000 -29,548,000 -6,735,000 -72,205,000 -71,433,000 -124,875,000 51,715,000 -52,643,000 -46,052,000 -72,563,000 85,861,000 -46,947,000 -61,419,000 
          accrued unbilled revenues
        134,000,000 -114,000,000 56,000,000 -53,000,000 63,000,000 -41,000,000 56,000,000 -67,000,000 73,000,000 -123,000,000 11,000,000 35,000,000 329,000,000 -312,000,000 -1,000,000 -76,000,000 146,000,000 -207,000,000 44,000,000 -109,000,000 123,000,000 -127,000,000 27,000,000 -52,000,000 149,000,000 -90,000,000 17,000,000 23,000,000 92,000,000 -105,000,000 -1,000,000 -44,000,000 159,000,000 -138,175,000 -17,158,000 -53,054,000 174,387,000 -161,980,000 21,856,000 -64,285,000 129,444,000 -108,800,000 36,644,000 -38,193,000 183,974,000 -153,668,000 34,849,000 -33,860,000 111,417,000 -111,519,000 50,583,000 -39,533,000 76,602,000 -141,480,000 27,845,000 -58,318,000 197,330,000 -135,903,000 38,018,000 -40,160,000 157,996,000 -174,411,000 
          inventories
        2,000,000 -98,000,000 -105,000,000 -93,000,000 -4,000,000 -69,000,000 -69,000,000 -52,000,000 50,000,000 -171,000,000 -27,000,000 -89,000,000 189,000,000 69,000,000 -228,000,000 -151,000,000 107,000,000 -44,000,000 -89,000,000 -32,000,000 39,000,000 -43,000,000 -52,000,000 -18,000,000 33,000,000 -24,000,000 -85,000,000 -59,000,000 84,000,000 -102,000,000 -64,000,000 -17,000,000 118,000,000 6,158,000 -74,591,000 -22,922,000 88,355,000 7,552,000 -88,083,000 -6,690,000 88,570,000 36,419,000 -112,220,000 -27,449,000 92,010,000 37,119,000 -132,945,000 -65,033,000 140,301,000 26,330,000 -110,602,000 -47,181,000 87,865,000 27,147,000 -89,584,000 1,222,000 143,873,000 -10,225,000 -123,235,000 -42,567,000 118,595,000 34,759,000 
          other current assets
        415,000,000 -264,000,000 53,000,000 107,000,000 -18,000,000 -152,000,000 66,000,000 12,000,000 -65,000,000 -18,000,000 65,000,000 31,000,000 8,000,000 -71,000,000 -13,000,000 36,000,000 -10,000,000 -42,000,000 -16,000,000 16,000,000 8,000,000 23,000,000 -75,000,000 38,000,000 -31,000,000 22,000,000 -16,000,000 52,000,000 -33,000,000 -34,000,000 13,000,000 38,000,000 1,000,000 -55,208,000 148,232,000 -7,266,000 -76,758,000 -19,051,000 11,073,000 86,128,000 -16,635,000 -63,172,000 3,365,000 12,395,000 56,685,000 -85,399,000 6,256,000 34,163,000 -66,320,000 -24,131,000 -23,640,000 80,903,000 -51,203,000 -418,000 31,002,000 10,256,000 -71,547,000 2,242,000 7,819,000 8,846,000 43,551,000 -7,174,000 
          accounts payable
        -191,000,000 35,000,000 69,000,000 -49,000,000 -105,000,000 79,000,000 -46,000,000 118,000,000 -114,000,000 77,000,000 217,000,000 -84,000,000 -359,000,000 43,000,000 15,000,000 171,000,000 -34,000,000 77,000,000 76,000,000 6,000,000 -21,000,000 64,000,000 63,000,000 41,000,000 -201,000,000 44,000,000 101,000,000 -161,000,000 4,000,000 53,000,000 38,000,000 41,000,000 -42,000,000 110,759,000 -15,410,000 69,041,000 -121,390,000 67,218,000 22,721,000 49,868,000 -22,063,000 -3,865,000 15,895,000 -33,003,000 -99,029,000 102,546,000 -8,054,000 -110,004,000 -37,730,000 135,738,000 -4,922,000 -3,686,000 5,311,000 17,949,000 58,800,000 25,573,000 -202,649,000 96,429,000 -114,797,000 104,540,000 -72,424,000 94,095,000 
          net regulatory assets and liabilities
        87,000,000 -76,000,000 -63,000,000 -75,000,000 25,000,000 154,000,000 132,000,000 69,000,000 81,000,000 140,000,000 202,000,000 224,000,000 345,000,000 331,000,000 26,000,000 -2,000,000 215,000,000 24,000,000 -203,000,000 167,000,000 -961,000,000 -5,000,000 -151,000,000 -89,000,000 101,000,000 -60,000,000 -31,000,000 -128,000,000 153,000,000 59,000,000 21,000,000 -4,000,000 147,000,000 10,556,000 -28,054,000 -16,365,000 17,863,000 -23,289,000 -30,353,000 -140,000 34,404,000 -13,603,000 -13,527,000 -16,502,000 146,097,000 33,689,000 98,459,000 63,928,000 -253,000 40,677,000 23,955,000 -11,879,000 88,572,000 4,018,000 -11,064,000 -48,960,000 61,872,000 14,944,000 176,226,000 -59,741,000 17,853,000 -20,262,000 
          other current liabilities
        110,000,000 -376,000,000 492,000,000 -319,000,000 29,000,000 -79,000,000 201,000,000 -259,000,000 -180,000,000 17,000,000 257,000,000 -137,000,000 63,000,000 51,000,000 185,000,000 -185,000,000 51,000,000 21,000,000 243,000,000 -278,000,000 13,000,000 83,000,000 187,000,000 -164,000,000 -77,000,000 85,000,000 95,000,000 -159,000,000 -36,000,000 97,000,000 89,000,000 -230,000,000 -17,000,000 73,512,000 78,672,000 -147,914,000 -42,270,000 96,260,000 88,065,000 -119,147,000 -44,929,000 5,841,000 152,401,000 -126,750,000 34,642,000 122,464,000 144,664,000 -130,989,000 1,008,000 -3,429,000 213,320,000 -103,654,000 20,318,000 78,197,000 82,370,000 -135,364,000 17,711,000 106,384,000 84,079,000 -83,601,000 5,491,000 39,308,000 
          pension and other employee benefit obligations
        -77,000,000 2,000,000 13,000,000 9,000,000 -124,000,000 5,000,000 4,000,000 5,000,000 -103,000,000 52,000,000 2,000,000 8,000,000 -45,000,000 10,000,000 -27,000,000 -1,000,000 -31,000,000 -4,000,000 -3,000,000 4,000,000 -132,000,000 13,000,000 8,000,000 11,000,000 -157,000,000 3,000,000 1,000,000 6,000,000 -145,000,000 -45,000,000 8,000,000 4,000,000 -146,000,000 1,455,000 6,024,000 8,086,000 -148,565,000 5,643,000 12,212,000 10,212,000 -118,774,000 12,757,000 -3,332,000 6,788,000 -85,469,000 10,006,000 3,992,000 10,325,000 -125,780,000 3,223,000 10,570,000 10,929,000 -181,091,000 -2,641,000 -12,383,000 11,132,000 -180,030,000 -14,179,000 -4,646,000 2,112,000 -134,004,000  
          other
        -24,000,000 -101,000,000 -5,000,000 -26,000,000 -28,000,000 -154,000,000 -50,000,000 137,000,000 -83,000,000 -62,000,000 -29,000,000 -7,000,000 -59,000,000 -123,000,000   -38,000,000 41,000,000 -125,000,000 41,000,000 -40,000,000 -34,000,000 -49,000,000 -68,000,000 14,000,000 -79,000,000 135,000,000 6,000,000 -22,000,000 -55,000,000 -10,000,000 -5,000,000 -1,000,000 -423,000 -136,000   -623,000 122,000 -388,000 -650,000 731,000 1,238,000 -2,645,000 -2,585,000 458,000 -67,000 -1,501,000 -3,242,000 172,000 1,049,000 -2,745,000 -3,109,000 367,000 1,280,000 -1,304,000      
          net cash from operating activities
        1,697,000,000 209,000,000 1,765,000,000 1,081,000,000 1,028,000,000 664,000,000 1,737,000,000 1,190,000,000 1,050,000,000 974,000,000 1,898,000,000 918,000,000 1,537,000,000 765,000,000 1,179,000,000 848,000,000 1,140,000,000 610,000,000 1,090,000,000 625,000,000 -136,000,000 674,000,000 1,026,000,000 479,000,000 669,000,000 706,000,000 1,223,000,000 541,000,000 793,000,000 629,000,000 1,056,000,000 550,000,000 887,000,000 758,820,000 1,075,361,000 573,664,000 718,155,000 639,445,000 1,000,315,000 622,476,000 790,063,000 535,917,000 980,877,000 523,651,000 985,394,000 643,851,000 964,830,000 446,862,000 592,649,000 581,128,000 928,683,000 431,897,000 642,328,000 432,835,000 706,625,000 387,813,000 477,483,000 481,404,000 801,002,000 463,673,000 659,443,000 372,213,000 
          capital expenditures
          free cash flows
        1,697,000,000 209,000,000 1,765,000,000 1,081,000,000 1,028,000,000 664,000,000 1,737,000,000 1,190,000,000 1,050,000,000 974,000,000 1,898,000,000 918,000,000 1,537,000,000 765,000,000 1,179,000,000 848,000,000 1,140,000,000 610,000,000 1,090,000,000 625,000,000 -136,000,000 674,000,000 1,026,000,000 479,000,000 669,000,000 706,000,000 1,223,000,000 541,000,000 793,000,000 629,000,000 1,056,000,000 550,000,000 887,000,000 758,820,000 1,075,361,000 573,664,000 718,155,000 639,445,000 1,000,315,000 622,476,000 790,063,000 535,917,000 980,877,000 523,651,000 985,394,000 643,851,000 964,830,000 446,862,000 592,649,000 581,128,000 928,683,000 431,897,000 642,328,000 432,835,000 706,625,000 387,813,000 477,483,000 481,404,000 801,002,000 463,673,000 659,443,000 372,213,000 
          investing activities
                                                                      
          capital/construction expenditures
        -3,022,000,000 -3,438,000,000 -3,055,000,000 -2,427,000,000 -1,988,000,000 -2,217,000,000 -1,779,000,000 -1,831,000,000 -1,537,000,000 -1,614,000,000 -1,641,000,000 -1,334,000,000 -1,265,000,000 -1,313,000,000 -1,285,000,000 -1,098,000,000 -942,000,000 -1,212,000,000 -1,065,000,000 -943,000,000 -1,024,000,000 -1,688,000,000 -1,112,000,000 -962,000,000 -1,607,000,000                                      
          purchase of investment securities
        -763,000,000 -346,000,000 -283,000,000 -330,000,000 -241,000,000 -305,000,000 -224,000,000 -280,000,000 -189,000,000 -290,000,000 -288,000,000 -180,000,000 -236,000,000 -277,000,000 -268,000,000 -631,000,000 -156,000,000 -217,000,000 88,000,000 -429,000,000 -199,000,000 -123,000,000                                         
          proceeds from the sale of investment securities
        763,000,000 346,000,000 281,000,000 330,000,000 240,000,000 295,000,000 216,000,000 271,000,000 179,000,000 281,000,000 279,000,000 171,000,000 228,000,000 268,000,000 260,000,000 622,000,000 147,000,000 212,000,000 121,000,000 216,000,000 194,000,000 118,000,000 110,000,000 320,000,000 830,000,000 513,000,000 -16,000,000 178,000,000 300,000,000 354,000,000 122,000,000 178,000,000 179,000,000 720,442,000 598,110,000 182,803,000 167,645,000 151,488,000 65,057,000                        
          net cash from investing activities
        -3,019,000,000 -3,477,000,000 -3,062,000,000 -2,439,000,000 -1,991,000,000 -2,231,000,000 -1,794,000,000 -1,847,000,000 -1,556,000,000 -1,634,000,000 -1,653,000,000 -1,355,000,000 -1,284,000,000 -1,332,000,000 -1,266,000,000 -1,103,000,000 -952,000,000 -1,222,000,000 -863,000,000 -1,167,000,000 -1,035,000,000 -1,719,000,000 -441,000,000 -974,000,000 -1,606,000,000 -1,214,000,000 -1,421,000,000 -856,000,000 -852,000,000 -1,280,000,000 -841,000,000 -993,000,000 -872,000,000 -1,057,400,000 -764,522,000 -726,339,000 -747,739,000 -1,055,156,000 -762,937,000 -749,213,000 -694,107,000 -1,483,526,000 -708,225,000 -692,634,000 -738,389,000 -882,495,000 -703,531,000 -730,455,000 -800,770,000 -902,590,000 -798,817,000 -798,713,000 -713,264,000 -723,346,000 -653,234,000 -557,350,000 -399,012,000 -586,846,000 -571,072,000 -465,535,000 -624,348,000 -1,285,766,000 
          financing activities
                                                                      
          (repayments) proceeds from short-term borrowings
        -70,000,000                                                              
          proceeds from issuances of long-term debt
        3,259,000,000 880,000,000 990,000,000 1,816,000,000 2,077,000,000 4,000,000 -1,000,000 2,166,000,000 1,478,000,000 -1,000,000 890,000,000   98,000,000   790,000,000 99,000,000 1,821,000,000 493,000,000    1,118,000,000 427,000,000 392,000,000  195,000,000                                
          proceeds from issuance of common stock
        1,000,000 2,198,000,000 8,000,000 1,021,000,000 122,000,000 8,000,000 1,008,000,000 93,000,000 8,000,000 187,000,000 8,000,000 69,000,000 6,000,000 166,000,000 5,000,000   353,000,000    722,000,000    1,000,000    27,000,000            1,713,000 1,889,000 1,998,000 1,411,000 2,159,000 2,066,000 113,025,000 63,548,000 2,347,000 2,307,000 67,029,000 160,084,000 2,172,000 2,180,000 2,100,000 1,598,000 32,527,000 2,375,000 1,911,000 1,878,000 451,389,000 
          dividends paid
        -347,000,000 -328,000,000 -329,000,000 -319,000,000 -306,000,000 -304,000,000 -296,000,000 -295,000,000 -280,000,000 -278,000,000 -278,000,000 -277,000,000 -259,000,000 -258,000,000 -257,000,000 -257,000,000 -240,000,000 -237,000,000 -238,000,000 -237,000,000 -223,000,000 -218,000,000 -217,000,000 -217,000,000 -204,000,000 -204,000,000 -200,000,000 -200,000,000 -187,000,000 -186,000,000 -185,000,000 -184,000,000 -175,000,000 -182,955,000 -182,795,000 -182,794,000 -172,456,000 -172,704,000 -172,704,000 -172,703,000 -162,410,000 -154,357,000 -154,195,000 -153,997,000 -144,025,000 -143,825,000 -143,225,000 -142,328,000 -132,033,000 -131,894,000 -131,756,000 -125,966,000 -124,426,000 -124,189,000 -124,058,000 -119,348,000 -119,162,000 -123,390,000 -119,655,000 -116,094,000 -115,621,000 -109,923,000 
          net cash from financing activities
        2,808,000,000 2,490,000,000 895,000,000 1,689,000,000 1,907,000,000 201,000,000 4,000,000 1,754,000,000 878,000,000 195,000,000 74,000,000 598,000,000 -250,000,000 561,000,000 -131,000,000 500,000,000 -264,000,000 147,000,000 -134,000,000 41,000,000 2,081,000,000 289,000,000 -1,334,000,000 1,885,000,000 933,000,000 -108,000,000 709,000,000 574,000,000 6,000,000 585,000,000 -334,000,000 659,000,000 18,000,000 213,215,000 -204,380,000 140,072,000 19,093,000 146,802,000 39,296,000 101,957,000 -79,405,000 628,140,000 -3,840,000 171,536,000 -193,569,000 180,384,000 -222,971,000 250,820,000 233,290,000 326,772,000 -86,853,000 312,677,000 101,573,000 -374,439,000 630,352,000 133,325,000 -39,413,000 -28,029,000 -137,378,000 9,127,000 -49,194,000 802,973,000 
          net change in cash, cash equivalents and restricted cash
        1,486,000,000  -402,000,000 331,000,000 944,000,000  -53,000,000 1,097,000,000 372,000,000  319,000,000 161,000,000 3,000,000  -218,000,000 245,000,000 -76,000,000  93,000,000 -501,000,000 910,000,000   1,390,000,000 -4,000,000                                      
          cash, cash equivalents and restricted cash at beginning of period
        274,000,000 179,000,000 129,000,000 111,000,000 166,000,000 129,000,000   248,000,000                                      
          cash, cash equivalents and restricted cash at end of period
        1,760,000,000 -778,000,000 -402,000,000 331,000,000 1,123,000,000 -1,366,000,000 -53,000,000 1,097,000,000 501,000,000 -465,000,000 319,000,000 161,000,000 114,000,000 -6,000,000 -218,000,000 245,000,000 90,000,000 -465,000,000 93,000,000 -501,000,000 1,039,000,000   1,390,000,000 244,000,000                                      
          supplemental disclosure of cash flow information:
                                                                      
          cash paid for interest
        -283,000,000 -430,000,000 -249,000,000 -331,000,000 -252,000,000 -338,000,000 -276,000,000 -287,000,000 -230,000,000 -293,000,000 -191,000,000 -252,000,000 -209,000,000 -259,000,000 -203,000,000 -223,000,000 -202,000,000 -196,000,000 -202,000,000 -184,000,000 -206,000,000 -176,000,000 -218,000,000 -157,000,000 -207,000,000 -154,000,000 -200,000,000 -154,000,000 -190,000,000 -142,000,000 -178,000,000 -132,000,000 -181,000,000 -127,426,000 -187,224,000 -126,969,000 -174,381,000 -130,694,000 -167,348,000 -129,443,000 -164,511,000 -117,982,000 -158,038,000 -105,123,000 -161,717,000 -105,416,000 -155,725,000 -98,939,000 -152,522,000 -103,781,000 -153,006,000 -104,626,000 -153,498,000 -127,221,000 -155,030,000 -124,991,000 -156,275,000      
          supplemental disclosure of non-cash investing and financing transactions:
                                                                      
          accrued property, plant and equipment additions
        1,315,000,000 -80,000,000 169,000,000 190,000,000 891,000,000 223,000,000 221,000,000 68,000,000 452,000,000 144,000,000 -88,000,000 48,000,000 449,000,000 233,000,000 -8,000,000 113,000,000 288,000,000 25,000,000 -33,000,000 97,000,000 412,000,000 -533,000,000 497,000,000 152,000,000 284,000,000 1,000,000 116,000,000 66,000,000 238,000,000                                  
          inventory transfers to property, plant and equipment
        59,000,000 60,000,000 71,000,000 156,000,000 61,000,000 41,000,000 53,000,000 65,000,000 99,000,000 155,000,000 -36,000,000 44,000,000 34,000,000 44,000,000 4,000,000 10,000,000 20,000,000 44,000,000 21,000,000 22,000,000 25,000,000 56,000,000 161,000,000 33,000,000  24,000,000 22,000,000 18,000,000                                  
          operating lease and finance lease right-of-use assets
        48,000,000                                                              
          issuance of common stock for reinvested dividends and/or equity awards
        18,000,000 17,000,000 24,000,000 21,000,000 18,000,000 15,000,000 18,000,000 20,000,000 15,000,000 18,000,000 14,000,000 11,000,000 21,000,000 17,000,000 13,000,000 16,000,000 11,000,000 34,000,000                                             
          see notes to consolidated financial statements
                                                                      
          earnings from equity method investments
             -3,000,000 -8,000,000 -8,000,000 -8,000,000 -7,000,000 -9,000,000 -11,000,000 -9,000,000 -1,000,000 -11,000,000 -15,000,000 -15,000,000 -13,000,000                                            
          proceeds (repayments) of short-term borrowings
                                                                      
          repayments of long-term debt
         -490,000,000 -291,000,000   -106,000,000                             -250,180,000 -217,000 -455,734,000 -191,000 -579,643,000 -333,000 -238,000 -250,190,000 1,000 -455,000                  
          net change in cash and cash equivalents
                             -756,000,000     511,000,000 259,000,000 -53,000,000 -66,000,000 -119,000,000 216,000,000 33,000,000 -85,365,000 106,459,000 -12,603,000 -10,491,000 -268,909,000 276,674,000 -24,780,000 16,551,000 -319,469,000 268,812,000 2,553,000 53,436,000 -58,260,000 38,328,000 -32,773,000 25,169,000 5,310,000 43,013,000 -54,139,000 30,637,000 -664,950,000 683,743,000 -36,212,000 39,058,000      
          operating and finance lease right-of-use assets
                                                                      
          loss (earnings) from equity method investments
          -6,000,000 8,000,000 1,000,000                                                          
          proceeds (repayments) from short-term borrowings
                                                                      
          cash received for income taxes, net; includes proceeds from tax credit transfers
          103,000,000 344,000,000 64,000,000 104,000,000 133,000,000 220,000,000 131,000,000                                                      
          proceeds from short-term borrowings
                           268,000,000 893,000,000  -910,000,000 -355,000,000 1,170,000,000    214,000,000    211,000,000                       142,000,000 120,000,000    65,100,000  
          operating lease right-of-use assets
           104,000,000 55,000,000 95,000,000 3,000,000   165,000,000 23,000,000 3,000,000 47,000,000 124,000,000 2,000,000   4,000,000 3,000,000   8,000,000 353,000,000   125,000,000 -125,000,000 184,000,000 1,659,000,000                                  
          proceeds from (repayments of) short-term borrowings
            24,000,000        266,000,000    -9,000,000 -742,000,000                300,000,000 -270,000,000 179,000,000 213,000,000           12,800,000 6,000,000     298,000,000         
          repayments of short-term borrowings
             600,000,000   -322,000,000  -544,000,000                            -81,000,000 264,000,000 -663,000,000                      
          repayments of long-term debt, including reacquisition premiums
                  -1,000,000 -400,000,000 -250,000,000    -18,000,000 1,000,000 -400,000,000 -300,000,000    -550,000,000 1,000,000 -400,000,000 -151,000,000 -300,000,000   99,000            -240,000 -224,000 -275,260,000 -224,000 2,413,000 -3,348,000 -400,149,000 -251,367,000 -649,231,000 -651,077,000 -1,697,000 -758,000      
          (repayments of) proceeds from short-term borrowings
                     655,000,000 22,000,000                -244,000,000             -518,000,000 -50,500,000      -52,000,000 -71,000,000 -177,000,000          
          cash received for income taxes
                            -3,000,000 29,000,000 -7,000,000   -1,000,000   31,000,000    1,949,000 45,904,000    -100,000 53,931,000 7,414,000  -966,000 -4,099,000 62,697,000  -246,000 -4,540,000 -164,000  3,170,000    -382,000 -4,702,000 -1,173,000  -1,426,000 -4,058,000 59,051,000  
          cash paid for income taxes
                  -19,000,000 -48,000,000 -1,000,000  -7,000,000    -1,000,000                                            
          sale of mec
                                                                     
          net realized and unrealized hedging and derivative transactions
                                         2,062,000 -279,000 -3,960,000 4,177,000 4,632,000 -596,000 -1,673,000 5,576,000 3,111,000 5,358,000 672,000 12,778,000 6,860,000 1,049,000 -9,787,000 7,384,000 7,307,000 -9,257,000 -2,971,000 217,000 4,815,000     -2,265,000 2,307,000 14,495,000 25,584,000 
          issuance of common stock for equity awards
                           16,000,000 19,000,000 16,000,000 16,000,000 17,000,000 18,000,000  14,000,000 15,000,000 17,000,000  17,000,000 15,000,000 20,000,000  4,889,000                            
          (a) as of june 30, 2020, 9 million of cash was recorded in prepayments and other current assets related to mec.
                                                                      
          equity earnings of unconsolidated subsidiaries
                            -14,000,000 -11,000,000 -12,000,000 -6,000,000 -11,000,000 -10,000,000 -10,000,000 -10,000,000 -9,000,000 -10,000,000 -9,000,000 -10,000,000 -6,000,000 -7,504,000 -7,080,000 -7,541,000 -7,875,000 -9,623,000 -9,701,000 -9,617,000 -13,182,000 -10,030,000 -8,162,000 -8,422,000 -7,776,000 -7,501,000 -7,401,000 -7,811,000 -7,438,000 -7,641,000 -7,273,000 -7,529,000 -7,577,000 -7,821,000 -7,490,000 -7,502,000 -7,158,000 -7,714,000 -7,423,000 -7,677,000 -7,713,000 -7,515,000 
          dividends from unconsolidated subsidiaries
                            11,000,000 10,000,000 11,000,000 10,000,000 11,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 9,000,000 9,000,000 9,000,000 8,684,000 8,809,000 11,753,000 11,754,000 11,668,000 11,592,000 11,429,000 11,481,000 10,694,000 9,680,000 9,878,000 9,876,000 9,577,000 9,016,000 9,264,000 8,850,000 8,913,000 8,820,000 9,144,000 9,539,000 8,548,000 16,894,000 8,028,000 8,553,000 8,550,000 8,477,000 8,454,000 8,717,000 
          cash and cash equivalents at beginning of period
                                 147,000,000 83,000,000 524,000 84,476,000 84,940,000 79,608,000 107,144,000 82,323,000 60,684,000 108,437,000 7,859,000 
          cash and cash equivalents at end of period
                             -756,000,000     511,000,000 259,000,000 94,000,000 -66,000,000 -119,000,000 216,000,000 116,000,000 -84,841,000 106,459,000 -12,603,000 73,985,000 -268,909,000 276,674,000 -24,780,000 101,491,000 -319,469,000 268,812,000 2,553,000 133,044,000 -58,260,000 38,328,000 -32,773,000 132,313,000 5,310,000 43,013,000 -54,139,000 112,960,000 -664,950,000 683,743,000 -36,212,000 99,742,000 -133,471,000 92,552,000 7,265,000 94,338,000 -105,018,000 
          purchases of investment securities
                               -325,000,000 -835,000,000 -523,000,000 16,000,000 -183,000,000 -305,000,000 -359,000,000 -127,000,000 -182,000,000 -185,000,000 -725,531,000 -603,203,000 -195,528,000 -172,738,000 -156,581,000 -70,151,000                        
          utility capital/construction expenditures
                                 -1,207,000,000 -1,329,000,000 -845,000,000 -844,000,000 -1,197,000,000 -857,000,000 -1,020,000,000 -883,000,000 -1,062,548,000 -782,659,000 -724,720,000 -749,073,000 -1,069,067,000 -773,354,000 -712,810,000 -700,319,000 -1,496,990,000 -708,410,000 -707,350,000 -770,609,000 -898,452,000 -725,591,000 -753,120,000 -822,628,000 -941,127,000 -857,420,000 -844,527,000 -752,251,000 -764,366,000 -702,281,000 -606,344,000 -497,218,000 -601,361,000 -481,937,000 -581,930,000 -540,339,000 -655,340,000 
          proceeds from issuance of long-term debt
                                             791,126,000 295,212,000 590,303,000 747,127,000 -978,000 785,656,000   -210,000 -788,000 542,583,000 295,999,000 -3,094,000 97,944,000 842,763,000 494,282,000 98,809,000 1,580,307,000 110,270,000 745,000 -88,000    395,038,000 
          inventory and other asset transfers to property, plant and equipment
                                                                      
          issuance of common stock for reinvested dividends and equity awards
                                            11,673,000 11,900,000                         
          repayments from short-term borrowings
                                                                      
          repurchases of common stock
                                         -57,000 -2,943,000                          
          change in other noncurrent assets
                                      2,000,000 8,000,000 2,000,000 14,002,000 -8,326,000 -6,939,000 263,000 -4,376,000 -5,452,000 -5,167,000 -1,196,000 8,179,000 1,690,000 689,000 -5,000 355,000 -3,846,000 -199,000 48,054,000 -36,708,000 9,770,000 -7,636,000 24,576,000 5,639,000 2,103,000 -2,087,000 -38,806,000 2,858,000 8,092,000 2,599,000 10,520,000 10,120,000 
          change in other noncurrent liabilities
                                      -27,000,000 -7,000,000 -17,000,000 -4,487,000 -44,807,000 -4,013,000 -12,693,000 -13,840,000 -3,752,000 -13,141,000 -8,508,000 1,892,000 -17,108,000 -10,989,000 -25,885,000 17,546,000 -2,871,000 -10,002,000 -20,347,000 7,893,000 10,195,000 -5,323,000 5,160,000 759,000 9,363,000 -7,341,000 -6,686,000 -19,476,000 -5,474,000 -9,028,000 -27,606,000 1,444,000 
          property, plant and equipment additions in accounts payable
                                      66,000,000 21,000,000 241,000,000 146,068,000 35,682,000 47,633,000 185,617,000 32,800,000 -31,215,000 59,552,000 192,818,000 37,105,000 78,324,000 -33,365,000 239,905,000 9,767,000 102,259,000 15,389,000 290,058,000 153,244,000 -3,225,000 45,904,000 256,530,000 59,955,000 -44,503,000 50,034,000 224,316,000 1,322,000 15,678,000 4,413,000 116,145,000 112,240,000 
          investments in unconsolidated subsidiaries and other
                                        -3,000,000                              
          conservation and demand side management program amortization
                                         73,000 418,000 754,000 755,000 765,000 766,000 1,161,000 1,162,000 1,162,000 1,162,000 1,450,000 1,451,000 1,451,000 1,451,000 1,576,000 1,555,000 1,507,000 1,599,000 1,713,000 1,712,000 1,747,000 1,746,000 1,883,000 1,882,000 1,837,000 1,901,000 3,054,000 3,024,000  
          amortization of investment tax credits
                                         -1,165,000 -1,278,000 -1,279,000 -1,278,000 -1,283,000 -1,307,000 -1,306,000 -1,307,000 -1,126,000 -1,383,000 -1,384,000 -1,384,000 -1,214,000 -1,443,000 -1,443,000 -1,443,000 -780,000 -1,659,000 -1,657,000 -1,657,000 -1,954,000 -1,552,000 -1,552,000 -1,552,000 -1,454,000 -1,580,000 -1,580,000 -1,580,000 -1,571,000 
          loss on monticello life cycle management/extended power uprate project
                                                 129,463,000                  
          proceeds from insurance recoveries
                                             2,914,000   2,996,000 24,241,000 1,740,000 4,260,000 40,000,000 26,500,000 23,500,000 40,943,000 32,892,000        
          investments in wyco development llc and other
                                          67,000 -5,112,000 -2,571,000 -1,792,000 -1,910,000 -260,000                      
          benefit from bad debts
                                                                      
          cash received (paid) for income taxes
                                                            17,939,000          
          purchase of common stock for settlement of equity awards
                                              -2,021,000 -789,000             -23,307,000      
          issuance of common stock for reinvested dividends and 401(k) plans
                                               5,794,000 7,703,000 13,742,000 8,671,000 16,065,000 14,433,000 19,306,000 13,500,000 14,747,000 14,525,000 1,987,000 17,459,000 18,713,000 18,791,000 16,373,000 15,807,000 16,728,000 18,815,000 16,396,000 17,639,000 17,261,000 20,419,000 15,220,000 
          purchases of investments in external decommissioning fund
                                                -109,373,000 -484,664,000 -133,160,000 -252,274,000 -387,826,000 -96,076,000 -94,713,000 -175,232,000 -229,548,000 -304,483,000 -286,698,000 -304,461,000 -586,239,000 -601,016,000 -129,648,000        
          proceeds from the sale of investments in external decommissioning fund
                                                104,280,000 482,949,000 117,255,000 250,558,000 386,111,000 93,876,000 93,066,000 173,587,000 227,901,000 288,694,000 285,097,000 302,552,000 584,948,000 586,067,000 129,648,000 157,743,000 213,618,000 356,733,000 515,418,000 527,335,000 699,156,000 472,017,000 
          gain on sale of transmission assets
                                                                      
          proceeds from sale of transmission assets
                                                                      
          investment in wyco development llc
                                                  -68,000 -443,000 -321,000 -156,000 -88,000 -971,000 -1,161,000 -4,086,000 -1,252,000 -1,935,000 -231,000 -201,000 -400,000 -207,000 -172,000 -678,000 -807,000 -60,000 -901,000 -1,927,000 
          prairie island epu and smartgridcity
                                                                      
          change in restricted cash
                                                             328,000 8,727,000 86,232,000 4,685,000 -100,018,000 20,000 26,000 -2,000 
          repurchase of common stock
                                                             -18,529,000      
          cash (paid) received for income taxes
                                                                      
          merricourt refund
                                                                    
          merricourt deposit
                                                                 -90,833,000  
          redemption of preferred stock
                                                                      
          remove income from discontinued operations
                                                              41,000 15,000 -124,000  -37,000    
          remove loss from discontinued operations
                                                                    -102,000  
          remove loss (income) from discontinued operations
                                                            18,000          
          remove (income) income from discontinued operations
                                                                      
          proceeds from the sale of assets
                                                                      
          acquisition of generation assets
                                                                      
          net derivative losses
                                                               192,000 7,133,000      
          purchase of investments in external decommissioning fund
                                                                -213,618,000 -356,735,000 -515,403,000 -527,348,000 -699,156,000 -472,345,000 
          storage assets under capital lease
                                                                      
          other investments
                                                                  -165,000 1,581,000 -5,545,000 101,000 
          repayment of short-term borrowings
                                                                      
          repayment of long-term debt, including reacquisition premiums
                                                                  -102,784,000 -1,190,000 -551,000 -359,931,000 
          net increase in cash and cash equivalents
                                                                     -110,580,000 
          cash paid for interest, net of amounts capitalized
                                                                  -138,552,000 -116,086,000 -150,473,000  
          proceeds from (repayment of) short-term borrowings
                                                                     426,400,000 
          proceeds from issuance of long-term
                                                                      
          net decrease in cash and cash equivalents
                                                                   7,265,000 -14,099,000  
          supplemental disclosure of non-cash investing transactions:
                                                                      
          supplemental disclosure of non-cash financing transactions:
                                                                      
          issuance of common stock for senior convertible notes
                                                                      
          conservation and demand side management program expenses
                                                                      
          recoverable purchased natural gas and electric energy costs
                                                                      
          operating cash flows from discontinued operations
                                                                      
          net increase in cash and cash equivalents — discontinued operations