7Baggers

American Water Works Company, Inc
(NYSE:AWK) 

AWK stock logo

American Water Works Company, Inc., through its subsidiaries, provides water and wastewater services in the United States. It offers water and wastewater services to approximately 1,700 communities in 16 states serving approximately 3.5 million active customers. The company serves residential custom...

Founded: 1886
Full Time Employees: 6,800
Sector: Utilities
Industry: Utilities-Regulated Water

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Quarterly
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    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 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 
                                                                             
      operating revenues
    1,207,000,000 1,271,000,000 1,451,000,000 1,276,000,000 1,142,000,000 1,201,000,000 1,323,000,000 1,149,000,000 1,011,000,000 1,032,000,000 1,167,000,000 1,097,000,000 938,000,000 931,000,000 1,082,000,000 937,000,000 842,000,000 951,000,000 1,092,000,000 999,000,000 888,000,000 923,000,000 1,079,000,000 931,000,000 844,000,000 902,000,000 1,013,000,000 882,000,000 813,000,000 850,000,000 976,000,000 853,000,000 761,000,000 821,000,000 936,000,000 844,000,000 756,000,000 802,000,000 930,000,000 827,000,000 743,000,000 782,595,000 896,206,000 782,121,000 698,078,000 731,378,000 846,169,000 759,159,000 681,946,000 712,260,000 829,196,000 724,265,000 636,137,000 680,913,000 831,815,000 745,607,000 618,554,000 623,716,000 766,450,000 674,248,000 610,936,000 664,455,000 786,946,000 671,223,000 588,053,000 597,837,000 679,956,000 612,740,000 550,170,000 568,551,000 672,193,000 589,369,000 506,815,000 
      operating expenses:
                                                                             
      operation and maintenance
    493,000,000 548,000,000 523,000,000 480,000,000 468,000,000 519,000,000 496,000,000 427,000,000 416,000,000 472,000,000 436,000,000 419,000,000 393,000,000 433,000,000 416,000,000 376,000,000 364,000,000 491,000,000 436,000,000 431,000,000 419,000,000 429,000,000 419,000,000 391,000,000 383,000,000 412,000,000 395,000,000 372,000,000 365,000,000 394,000,000 390,000,000 348,000,000 347,000,000 368,000,000 324,000,000 349,000,000 337,000,000 373,000,000 432,000,000 351,000,000 348,000,000 379,934,000 363,610,000 336,624,000 323,832,000 345,487,000 341,348,000 342,974,000 329,275,000 333,591,000 343,610,000 323,320,000 312,203,000 357,333,000 355,126,000 327,577,000 310,004,000 308,360,000 345,757,000 332,310,000 320,571,000 335,892,000 378,034,000 344,863,000 330,423,000 338,494,000 340,862,000 330,597,000 314,402,000 319,735,000 342,226,000 330,575,000 311,261,000 
      depreciation and amortization
    237,000,000 231,000,000 226,000,000 221,000,000 216,000,000 207,000,000 200,000,000 193,000,000 188,000,000 181,000,000 177,000,000 174,000,000 172,000,000 164,000,000 164,000,000 163,000,000 158,000,000 160,000,000 161,000,000 158,000,000 157,000,000 153,000,000 154,000,000 152,000,000 145,000,000 152,000,000 144,000,000 142,000,000 144,000,000 141,000,000 141,000,000 134,000,000 129,000,000 114,000,000 128,000,000 126,000,000 124,000,000 120,000,000 119,000,000 115,000,000 116,000,000 112,504,000 111,196,000 108,923,000 107,377,000 105,686,000 106,789,000 105,862,000 106,078,000 103,969,000 102,734,000 101,366,000 99,649,000 100,851,000 96,219,000 92,329,000 92,104,000 88,794,000 88,424,000 87,654,000 88,019,000 122,494,000 79,431,000 76,493,000 76,232,000 77,301,000 74,854,000 73,242,000 68,843,000 71,662,000 68,376,000 67,307,000 63,916,000 
      general taxes
    86,000,000 88,000,000 87,000,000 86,000,000 87,000,000 74,000,000 84,000,000 81,000,000 81,000,000 80,000,000 76,000,000 73,000,000 78,000,000 73,000,000 63,000,000 71,000,000 74,000,000 80,000,000 78,000,000 80,000,000 83,000,000 78,000,000 73,000,000 75,000,000 77,000,000 71,000,000 68,000,000 72,000,000 69,000,000 67,000,000 71,000,000 69,000,000 70,000,000 67,000,000 61,000,000 63,000,000 68,000,000 63,000,000 65,000,000 64,000,000 66,000,000 58,790,000 60,292,000 60,222,000 63,696,000 58,456,000 60,807,000 56,894,000 60,767,000 58,481,000 58,209,000 57,806,000 60,146,000 55,948,000 52,861,000 55,282,000 57,121,000 49,076,000 52,587,000 53,096,000 57,205,000 54,043,000 55,316,000 53,890,000 55,404,000 44,448,000 50,618,000 51,699,000 52,497,000 48,065,000 49,380,000 49,629,000 52,066,000 
      total operating expenses
    816,000,000 866,000,000 837,000,000 787,000,000 771,000,000 801,000,000 780,000,000 700,000,000 685,000,000 733,000,000 689,000,000 665,000,000 643,000,000 670,000,000 643,000,000 610,000,000 596,000,000 731,000,000 675,000,000 669,000,000 659,000,000 660,000,000 646,000,000 618,000,000 605,000,000 678,000,000 607,000,000 580,000,000 575,000,000 602,000,000 641,000,000 551,000,000 544,000,000 542,000,000 506,000,000 536,000,000 529,000,000 554,000,000 611,000,000 528,000,000 529,000,000 550,740,000 534,923,000 504,560,000 493,777,000 508,317,000 508,884,000 505,385,000 495,850,000 496,406,000 505,321,000 482,378,000 471,904,000 513,950,000 504,175,000 474,975,000 458,816,000 446,576,000 485,133,000 473,088,000 466,063,000 512,367,000 512,991,000 475,240,000 461,988,000 460,456,000 465,550,000 455,548,000 885,540,000 439,501,000 460,439,000 446,711,000 1,177,173,000 
      operating income
    391,000,000 405,000,000 614,000,000 489,000,000 371,000,000 400,000,000 543,000,000 449,000,000 326,000,000 299,000,000 478,000,000 432,000,000 295,000,000 261,000,000 439,000,000 327,000,000 246,000,000 220,000,000 417,000,000 330,000,000 229,000,000 263,000,000 433,000,000 313,000,000 239,000,000 224,000,000 406,000,000 302,000,000 238,000,000 248,000,000 335,000,000 302,000,000 217,000,000 279,000,000 430,000,000 308,000,000 227,000,000 248,000,000 319,000,000 299,000,000 214,000,000 231,855,000 361,283,000 277,561,000 204,301,000 223,061,000 337,285,000 253,774,000 186,096,000 215,854,000 323,875,000 241,887,000 164,233,000 166,963,000 327,640,000 270,632,000 159,738,000 177,140,000 281,317,000 201,160,000 144,873,000 152,088,000 273,955,000 195,983,000 126,065,000 137,381,000 214,406,000 157,192,000 -335,370,000 129,050,000 211,754,000 142,658,000 -670,358,000 
      yoy
    5.39% 1.25% 13.08% 8.91% 13.80% 33.78% 13.60% 3.94% 10.51% 14.56% 8.88% 32.11% 19.92% 18.64% 5.28% -0.91% 7.42% -16.35% -3.70% 5.43% -4.18% 17.41% 6.65% 3.64% 0.42% -9.68% 21.19% 0.00% 9.68% -11.11% -22.09% -1.95% -4.41% 12.50% 34.80% 3.01% 6.07% 6.96% -11.70% 7.72% 4.75% 3.94% 7.12% 9.37% 9.78% 3.34% 4.14% 4.91% 13.31% 29.28% -1.15% -10.62% 2.81% -5.75% 16.47% 34.54% 10.26% 16.47% 2.69% 2.64% 14.92% 10.71% 27.77% 24.68% -137.59% 6.46% 1.25% 10.19% -49.97%     
      qoq
    -3.46% -34.04% 25.56% 31.81% -7.25% -26.34% 20.94% 37.73% 9.03% -37.45% 10.65% 46.44% 13.03% -40.55% 34.25% 32.93% 11.82% -47.24% 26.36% 44.10% -12.93% -39.26% 38.34% 30.96% 6.70% -44.83% 34.44% 26.89% -4.03% -25.97% 10.93% 39.17% -22.22% -35.12% 39.61% 35.68% -8.47% -22.26% 6.69% 39.72% -7.70% -35.82% 30.16% 35.86% -8.41% -33.87% 32.91% 36.37% -13.79% -33.35% 33.90% 47.28% -1.64% -49.04% 21.06% 69.42% -9.82% -37.03% 39.85% 38.85% -4.74% -44.48% 39.79% 55.46% -8.24% -35.92% 36.40% -146.87% -359.88% -39.06% 48.43% -121.28%  
      other income:
                                                                             
      interest expense
    -163,000,000 -162,000,000 -158,000,000 -151,000,000 -144,000,000 -136,000,000 -132,000,000 -131,000,000 -124,000,000 -118,000,000 -117,000,000 -110,000,000 -115,000,000 -116,000,000 -111,000,000 -106,000,000 -100,000,000                                                         
      interest income
    12,000,000 23,000,000 23,000,000 22,000,000 22,000,000 23,000,000 22,000,000 25,000,000 24,000,000 21,000,000 23,000,000 15,000,000 14,000,000 13,000,000 14,000,000 12,000,000 13,000,000                                                         
      non-operating benefit costs
    5,000,000 4,000,000 4,000,000 4,000,000 4,000,000 5,000,000 7,000,000 7,000,000 9,000,000 6,000,000 9,000,000 8,000,000 9,000,000 19,000,000 19,000,000 20,000,000 19,000,000 19,000,000 20,000,000 19,000,000 20,000,000 12,000,000 12,000,000 12,000,000 13,000,000 4,000,000 4,000,000 4,000,000 4,000,000 10,000,000 5,000,000 2,000,000 3,000,000                                         
      other
    14,000,000 250,000 1,000,000  17,000,000 -250,000  -1,000,000 7,000,000   -1,000,000 11,000,000 -18,000,000 6,000,000 17,000,000 15,000,000 2,750,000 4,000,000 3,000,000 4,000,000 5,000,000 6,000,000 8,000,000 3,000,000 10,000,000 5,000,000 15,000,000 3,000,000 5,000,000 6,000,000 4,000,000 4,000,000 6,000,000 5,000,000 3,000,000 3,000,000 1,000,000 5,000,000 7,000,000 2,000,000 14,445,000 -189,000 -1,012,000 1,756,000 -605,000 -733,000 -317,000 -1,541,000 -2,564,000 -449,000 -256,000 -776,000 -684,000 39,000 335,000 -616,000 -578,000 13,000 679,000 -1,141,000 2,150,000 511,000 1,926,000 71,000 -187,000 -310,000 -1,409,000 1,114,000 25,808,000 881,000 -543,000 1,205,000 
      total other income
    -132,000,000 -123,000,000 -120,000,000 -113,000,000 -101,000,000 -97,000,000 -90,000,000 -88,000,000 -84,000,000 -81,000,000 -71,000,000 -75,000,000 -81,000,000 -83,000,000 -72,000,000 -57,000,000 -53,000,000 674,000,000 -77,000,000 -79,000,000 -74,000,000 -82,000,000 -81,000,000 -81,000,000 -80,000,000 -88,000,000 -88,000,000 -75,000,000 -86,000,000 -78,000,000 -80,000,000 -80,000,000 -77,000,000 -78,000,000 -90,000,000 -82,000,000 -82,000,000 -82,000,000 -76,000,000 -74,000,000 -78,000,000 -74,069,000 -74,198,000 -73,934,000 -70,799,000 -73,915,000 -73,472,000 -72,285,000 -73,090,000 -115,906,000 -74,883,000 -74,168,000 -75,422,000 -72,639,000 -72,616,000 -73,367,000 -75,093,000 -74,917,000 -74,558,000 -75,347,000 -74,760,000 -77,232,000 -71,232,000 -74,411,000 -75,780,000 -74,465,000 -72,605,000 -71,066,000 -67,138,000 -64,428,000 -66,047,000 -66,994,000 -66,228,000 
      income before income taxes
    259,000,000 282,000,000 494,000,000 376,000,000 270,000,000 303,000,000 453,000,000 361,000,000 242,000,000 218,000,000 407,000,000 357,000,000 214,000,000 178,000,000 367,000,000 270,000,000 193,000,000 894,000,000 340,000,000 251,000,000 155,000,000 181,000,000 352,000,000 232,000,000 159,000,000 136,000,000 318,000,000 227,000,000 152,000,000 170,000,000 255,000,000 222,000,000 140,000,000 201,000,000 340,000,000             181,489,000 113,006,000             74,856,000 202,723,000 121,572,000 50,285,000 -43,645,250 141,801,000 86,126,000 -402,508,000     
      provision for income taxes
    63,000,000 44,000,000 115,000,000 87,000,000 65,000,000 64,000,000 103,000,000 84,000,000 57,000,000 47,000,000 84,000,000 77,000,000 44,000,000 31,000,000 70,000,000 52,000,000 35,000,000 249,000,000 62,000,000 44,000,000 22,000,000 36,000,000 88,000,000 56,000,000 35,000,000 38,000,000 78,000,000 57,000,000 39,000,000 58,000,000 70,000,000 60,000,000 34,000,000 202,000,000 137,000,000 95,000,000 52,000,000 65,000,000 95,000,000 88,000,000 54,000,000 58,798,000 113,191,000 80,552,000 53,459,000 56,193,250 107,205,000 72,190,000 44,883,000 48,987,750 98,327,000 66,456,000 31,168,000 40,100,000 100,913,000 80,602,000 35,393,000 41,082,000 78,354,000 51,160,000 28,649,000 34,702,000 78,609,000 48,821,000 19,477,000 23,718,250 50,165,000 34,137,000  28,215,000 57,549,000 30,166,000 -4,102,000 
      net income attributable to common shareholders
    196,000,000 238,000,000 379,000,000 289,000,000 205,000,000 239,000,000 350,000,000 277,000,000 185,000,000 171,000,000 323,000,000 280,000,000 170,000,000 147,000,000 297,000,000 218,000,000 158,000,000 645,000,000 278,000,000 207,000,000 133,000,000 145,000,000 264,000,000 176,000,000 124,000,000 98,000,000 240,000,000 170,000,000 113,000,000                                             
      basic earnings per share:
                                                                             
      diluted earnings per share:
                                                                             
      weighted-average common shares outstanding:
                                                                             
      basic
    195 195 195 195 195 195 195 195 195 193 195 195 186 182 182 182 182 182 182 182 181 181 181 181 181 181 181 181 181 180 181 179 178 178 178 178 178 178 178 178 178 179                                
      diluted
    195 195 195 195 195 195 195 195 195 193 195 195 186 182 182 182 182 182 182 182 182 182 182 181 181 181 181 181 181 180 181 179 179 179 179 179 179 179 178 178 179 180                                
      interest
                     -75,000,000 -101,000,000 -101,000,000 -98,000,000 -99,000,000 -99,000,000 -101,000,000 -96,000,000 -98,000,000 -97,000,000 -94,000,000 -93,000,000 -91,000,000 -89,000,000 -86,000,000 -84,000,000 -83,000,000 -89,000,000 -85,000,000 -85,000,000 -83,000,000 -81,000,000 -81,000,000 -80,000,000 -79,270,000 -77,636,000 -75,421,000 -75,673,000 -75,145,000 -75,445,000 -73,668,000 -73,560,000 -74,904,000 -77,389,000 -77,757,000 -78,114,000 -74,794,000 -76,616,000 -79,730,000 -79,654,000 -79,089,000 -78,602,000 -78,504,000 -76,482,000 -82,736,000 -74,858,000 -78,734,000 -78,715,000 -76,754,000 -74,124,000 -73,688,000 -71,979,000 -72,437,000 -72,684,000 -70,066,000 -69,968,000 
      (gain) on asset dispositions and purchases
                             -2,250,000  -6,000,000 -3,000,000                                             
      impairment charge
                                  57,000,000                                      450,000,000 187,500,000   750,000,000 
      consolidated net income
                             98,000,000 240,000,000   112,000,000 185,000,000                                           
      net loss attributable to noncontrolling interest
                                  -2,000,000                                           
      gain on asset dispositions and purchases
                                 -5,000,000 -18,000,000  -2,000,000 -7,000,000 -7,000,000 -2,000,000  -2,000,000 -5,000,000 -2,000,000 -1,000,000 -628,000 -175,000 -1,209,000 -1,128,000       -114,000                      
      loss on early extinguishment of debt
                                 -2,000,000 -2,000,000   -1,000,000 -6,000,000                                       
      net income attributable to common stockholders
                                 113,750,000 187,000,000 162,000,000 106,000,000 -1,000,000 203,000,000 131,000,000 93,000,000 101,000,000 148,000,000 137,000,000 82,000,000                                 
      dividends declared per common share
                                 0.228 0.455 0.455  0.83 0.415 0.415  0.75 0.375 0.375  0.68 0.34 0.34  0.31 0.62 0.31                          
      income from continuing operations before income taxes
                                       226,000,000 145,000,000 166,000,000 243,000,000 225,000,000 136,000,000 157,786,000 287,085,000 203,627,000 133,502,000 149,146,000 263,813,000   99,948,000 248,992,000 167,719,000 88,811,000 94,324,000 255,024,000 197,265,000 84,645,000 102,223,000 206,759,000 125,813,000 70,113,000         64,622,000 145,707,000 75,664,000 -736,586,000 
      operating expenses
                                                                             
      other income
                                                                             
      allowance for other funds used during construction
                                             2,191,500 3,571,000 2,835,000 2,360,000 2,376,000 2,805,000 2,058,000 2,201,000 2,744,000 2,800,000 3,699,000 3,396,000 2,419,000 3,735,000 5,076,000 4,362,000 4,072,000 3,696,000 2,535,000 2,916,000 2,859,000 2,586,000 2,407,000 2,151,000 2,278,000 2,290,000 3,575,000 3,343,000 2,592,500 4,442,000 3,387,000 2,541,000 
      allowance for borrowed funds used during construction
                                             1,558,000 2,168,000 1,542,000 2,522,000 1,514,000 1,570,000 1,271,000 1,483,000 1,275,000 1,679,000 1,770,000 1,653,000 1,829,000 1,548,000 2,313,000 2,081,000 1,935,000 1,586,000 1,198,000 1,242,000 1,819,000 1,814,000 1,254,000 1,397,000 1,687,000 1,674,000 1,991,000 1,872,000 1,515,750 2,970,000 1,725,000 1,368,000 
      amortization of debt expense
                                             -1,438,500 -2,112,000 -1,878,000 -1,764,000 -2,055,000 -1,669,000 -1,629,000 -1,673,000 -1,874,000 -1,524,000 -1,624,000 -1,581,000 -1,409,000 -1,322,000 -1,361,000 -1,266,000 -1,257,000 -1,251,000 -1,255,000 -1,295,000 -1,324,000 -1,285,000 -1,264,000 -684,000 -1,489,000 -2,135,000 -1,535,000 -1,488,000 -1,535,000 -1,601,000 -1,441,000 -1,318,000 
      income from continuing operations
                                             98,988,000 173,894,000 123,075,000 80,043,000 93,946,000 156,608,000   59,693,000 150,665,000 101,263,000 57,643,000 54,224,000 154,111,000 116,663,000 49,252,000 61,141,000 128,405,000 74,653,000 41,464,000         36,407,000 88,158,000 45,498,000 -732,484,000 
      loss from discontinued operations, net of tax
                                                            -7,498,000                 
      net income
                                             94,253,000 173,894,000 123,075,000 80,043,000 93,501,000 152,185,000 109,299,000 68,123,000 59,693,000 150,665,000 101,263,000 57,643,000 55,478,000 153,812,000 107,026,000 41,754,000 40,293,000 137,422,000 84,566,000 47,332,000 40,154,000 124,114,000 72,751,000 30,808,000 36,371,000 91,636,000 51,989,000 -413,079,000 -149,707,000 88,158,000 45,498,000 -732,484,000 
      yoy
                                             0.80% 14.26% 12.60% 17.50% 56.64% 1.01% 7.94% 18.18% 7.60% -2.05% -5.38% 38.05% 37.69% 11.93% 26.56% -11.78% 0.35% 10.72% 16.24% 53.64% 10.40% 35.44% 39.94% -107.46% -124.29% 3.95% 14.27% -43.61%     
      qoq
                                             -45.80% 41.29% 53.76% -14.39% -38.56% 39.24% 60.44% 14.12% -60.38% 48.79% 75.67% 3.90% -63.93% 43.71% 156.33% 3.63% -70.68% 62.50% 78.67% 17.88% -67.65% 70.60% 136.14% -15.30% -60.31% 76.26% -112.59% 175.92% -269.82% 93.76% -106.21%  
      other comprehensive income, net of tax:
                                                                             
      pension amortized to periodic benefit cost:
                                                                             
      prior service cost, net of tax of 25 and 26 for the three
                                                                             
      months and 75 and 79 for the nine months, respectively
                                             29,250 39,000                               
      actuarial loss, net of tax of 833 and for the three
                                                                             
      months and 2,497 and (14) for the nine months, respectively
                                             976,500 1,302,000                               
      foreign currency translation adjustment
                                             -347,000 -482,000 90,000 -996,000 136,000 -490,000 446,000 -550,000 -478,000 296,000 -453,000 -366,000 -128,000 514,000 -211,000 259,000 205,000 -1,029,000 93,000 318,000 364,000 348,000           
      unrealized gain on cash flow hedge, net of tax of 10 and (439) for
                                                                             
      the three months and 31 and (439) for the nine months, respectively
                                             14,500 19,000                               
      total other comprehensive income, net of tax
                                             673,250 878,000                               
      comprehensive income
                                             94,926,250 174,772,000 124,525,000 80,408,000 47,575,000 150,914,000 109,779,000 67,607,000 134,959,000 153,232,000 103,081,000 59,548,000 30,794,000 156,195,000 108,685,000 43,882,000 11,171,000 137,563,000 85,828,000 48,820,000 29,794,000 125,574,000           
      average common shares outstanding during the period
                                                                             
      basic
                                             44,883.5 179,578 179,564 179,458 88 178,992 178,863 178,539 -177,493,186 177,965,000 177,716,000 177,327,000 155,000 176,621,000 176,331,000 175,914,000 58,000 175,547,000 175,469,000 175,259,000 48,000 174,859,000 174,774,000 174,721,000 2,172,000 174,595,000 163,229,000 160,011,000 39,990,000 159,949,000 159,932,000 160,000,000 
      diluted
                                             45,086.5 180,353 180,371 180,295 83 179,948 179,693 179,457 -178,726,944 179,154,000 178,910,000 178,465,000 185,000 177,841,000 177,491,000 177,028,000 109,000 176,593,000 176,419,000 176,048,000 205,000 175,062,000 174,850,000 174,797,000 2,172,000 174,691,000 163,301,000 160,011,000 39,990,000 160,000,000 159,976,000 160,000,000 
      (a) amounts may not sum due to rounding.
                                                                             
      months and 50 and 53 for the six months, respectively
                                               39,000                              
      actuarial loss, net of tax of 832 and for the three
                                                                             
      months and 1,664 and (10) for the six months, respectively
                                               1,302,000                              
      unrealized loss on cash flow hedge, net of tax of 11 for the
                                                                             
      three months and 21 for the six months, respectively
                                               19,000                              
      other comprehensive income
                                               1,450,000 365,000 -45,926,000 -1,271,000 480,000 -516,000 75,266,000 2,567,000 1,818,000 1,905,000 -24,684,000 2,383,000 1,659,000 2,128,000 -29,122,000 141,000 1,262,000 1,488,000 -10,360,000 1,460,000           
      (a) amounts may not sum due to rounding
                                                                             
      prior service cost, net of tax of 25 and 27, respectively
                                                39,000                             
      actuarial loss, net of tax of 832 and , respectively
                                                1,302,000                             
      unrealized loss on cash flow hedge, net of tax of 10
                                                20,000                             
      loss on asset dispositions and purchases
                                                 -154,000 -60,000 -345,000 -270,000 140,000 768,000  -94,000 -182,000 -31,000 -213,000 -413,000 346,000 -1,635,000               
      income from discontinued operations, net of tax
                                                 -445,000 -4,423,000       1,254,000 -299,000 -9,637,000  -20,848,000 9,017,000 9,913,000 5,868,000             
      pension plan amortized to periodic benefit cost:
                                                                             
      prior service cost, net of tax of 26 and 28 for the three months and 79 and 83 for the nine months, respectively
                                                 31,000 41,000                           
      actuarial loss, net of tax of and 1,424 for the three months and (14) and 4,273 for the nine months, respectively
                                                 -5,500 -7,000                           
      unrealized loss on cash flow hedge, net of tax of (439) for the three and nine months
                                                 -203,750 -815,000                           
      basic earnings per share
                                                 0.46 0.85 0.61 0.38                         
      diluted earnings per share
                                                 0.458 0.85 0.61 0.38                         
      prior service cost, net of tax of 26 and 27 for the three months and 53 and 55 for the six months, respectively
                                                   42,000                          
      actuarial loss, net of tax of and 1,425 for the three months and (10) and 2,849 for the six months, respectively
                                                   -8,000                          
      prior service cost, net of tax of 27 and 28, respectively
                                                    41,000                         
      actuarial loss, net of tax of and 1,424, respectively
                                                    -7,000                         
      prior service cost, net of tax of 28 and 28 for the three months and 83 and 84 for the nine months ended, respectively
                                                     32,500 43,000                       
      actuarial loss, net of tax of 1,424 and 1,167 for the three months and 4,273 and 3,501 for the nine months ended, respectively
                                                     1,670,750 2,228,000                       
      basic earnings per common share:
                                                                             
      diluted earnings per common share:
                                                                             
      average common shares outstanding during the period:
                                                                             
      basic
                                             44,883.5 179,578 179,564 179,458 88 178,992 178,863 178,539 -177,493,186 177,965,000 177,716,000 177,327,000 155,000 176,621,000 176,331,000 175,914,000 58,000 175,547,000 175,469,000 175,259,000 48,000 174,859,000 174,774,000 174,721,000 2,172,000 174,595,000 163,229,000 160,011,000 39,990,000 159,949,000 159,932,000 160,000,000 
      diluted
                                             45,086.5 180,353 180,371 180,295 83 179,948 179,693 179,457 -178,726,944 179,154,000 178,910,000 178,465,000 185,000 177,841,000 177,491,000 177,028,000 109,000 176,593,000 176,419,000 176,048,000 205,000 175,062,000 174,850,000 174,797,000 2,172,000 174,691,000 163,301,000 160,011,000 39,990,000 160,000,000 159,976,000 160,000,000 
      dividends per common share
                                                     -558.88 280 280  250 250 250 230 230 230 450 220 220 220 210 210 210 210 200 200     
      prior service cost, net of tax of 27 and 28 for the three months and 55 and 56 for the six months ended, respectively
                                                       44,000                      
      actuarial loss, net of tax of 1,425 and 1,167 for the three months and 2,849 and 2,334 for the six months ended, respectively
                                                       2,227,000                      
      prior service cost, net of tax of 28 and 28, respectively
                                                        43,000    44,000                 
      actuarial loss, net of tax of 1,424 and 1,167, respectively
                                                        2,228,000                     
      prior service cost, net of tax of 28 and 28 for the three months ended and 84 and 84 for the nine months ended, respectively
                                                         33,000 44,000                   
      actuarial loss, net of tax of 1,167 and 720 for the three months ended and 3,501 and 2,160 for the nine months ended, respectively
                                                         1,369,000 1,825,000                   
      prior service cost, net of tax of 28 and 28 for the three months ended and 56 and 56 for the six months ended, respectively
                                                           44,000                  
      actuarial loss, net of tax of 1,167 and 720 for the three months ended and 2,334 and 1,440 for the six months ended, respectively
                                                           1,826,000                  
      actuarial loss, net of tax of 1,167 and 720, respectively
                                                            1,825,000                 
      prior service cost, net of tax of 28 and 13 for the three months ended and 84 and 38 for the nine months ended, respectively
                                                             32,750 44,000               
      actuarial loss, net of tax of 720 and 698 for the three months ended and 2,160 and 2,094 for the nine months ended, respectively
                                                             844,500 1,126,000               
      loss on sale of assets
                                                               28,000 268,000 33,250 210,000 -6,000  -244,000 -784,000 10,000  39,000 457,000  -70,000 
      prior service cost, net of tax of 28 and 13 for the three months ended and 56 and 25 for the six months ended, respectively
                                                               43,000              
      actuarial loss, net of tax of 720 and 698 for the three months ended and 1,440 and 1,396 for the six months ended, respectively
                                                               1,126,000              
      prior service cost, net of tax of 28 and 12, respectively
                                                                44,000             
      actuarial loss, net of tax of 720 and 698, respectively
                                                                1,126,000             
      prior service cost, net of tax of 13 and 7 for the three months ended and 38 and 22 for the nine months ended, respectively
                                                                 14,750 20,000           
      actuarial loss, net of tax of 698 and 958 for the three months ended and 2,094 and 2,874 for the nine months ended, respectively
                                                                 819,000 1,092,000           
      income per common share:
                                                                             
      basic
                                                                 230 710 420 180         
      diluted
                                                                 230 710 420 180         
      gain on sale of assets
                                                                    -71,000    -202,000   -800,000  
      net income per common share:
                                                                             
      basic
                                                                     -405 520 320      
      diluted
                                                                     -405 520 320      
      benefit from income taxes
                                                                        10,571,000     
      loss per common share:
                                                                             
      basic
                                                                        -2,580     
      diluted
                                                                        -2,580     
      preferred dividends of subsidiaries
                                                                         -42,250 -55,000 -56,000 -56,000 
    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 2018-06-04 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 
                                                                                
        assets
                                                                                
        property, plant and equipment
      38,569,000,000 37,955,000,000 36,895,000,000 36,137,000,000 35,466,000,000 35,059,000,000 33,940,000,000 33,364,000,000 32,780,000,000 32,189,000,000 31,397,000,000 30,815,000,000 30,214,000,000 29,736,000,000 29,062,000,000 28,531,000,000 27,781,000,000 27,413,000,000 26,877,000,000 26,369,000,000 25,934,000,000 25,614,000,000 25,133,000,000 24,745,000,000 24,351,000,000 23,941,000,000 23,807,000,000 23,355,000,000 23,476,000,000 23,204,000,000 22,734,000,000 22,361,000,000 21,000,000 21,995,000,000 21,716,000,000 20,946,000,000 20,575,000,000 20,189,000,000 19,954,000,000 19,376,000,000 19,058,000,000 18,745,000,000 18,504,000,000                                
        accumulated depreciation
      -7,496,000,000 -7,379,000,000 -7,283,000,000 -7,205,000,000 -7,089,000,000 -7,021,000,000 -6,933,000,000 -6,832,000,000 -6,757,000,000 -6,751,000,000 -6,709,000,000 -6,627,000,000 -6,582,000,000 -6,513,000,000 -6,426,000,000 -6,429,000,000 -6,383,000,000 -6,329,000,000 -6,292,000,000 -6,155,000,000 -6,029,000,000 -5,904,000,000 -5,866,000,000 -5,801,000,000 -5,763,000,000 -5,709,000,000 -5,656,000,000 -5,557,000,000 -5,853,000,000 -5,795,000,000 -5,671,000,000 -5,584,000,000  -5,518,000,000 -5,470,000,000 -5,265,000,000 -5,184,000,000 -5,061,000,000 -4,962,000,000 -4,817,000,000 -4,741,000,000 -4,647,000,000 -4,571,000,000                                
        current assets:
                                                                                
        cash and cash equivalents
      137,000,000 98,000,000 166,000,000 94,000,000 114,000,000 96,000,000 127,000,000 48,000,000 584,000,000 330,000,000 628,000,000 794,000,000 213,000,000 85,000,000 77,000,000 71,000,000 75,000,000 116,000,000 70,000,000 70,000,000 69,000,000 547,000,000 560,000,000 569,000,000 556,000,000 60,000,000 94,000,000 64,000,000 63,000,000 130,000,000 86,000,000 68,000,000  55,000,000 55,000,000 93,000,000 64,000,000 78,000,000 75,000,000 46,000,000 52,000,000 66,000,000 45,000,000 75,224,000 144,752,000 24,294,000 23,080,000 74,128,000 32,133,000 30,755,000 26,964,000 32,454,000 20,366,000 21,181,000 24,433,000 18,531,000 12,919,000 9,502,000 14,207,000 15,621,000 13,466,000 13,528,000 13,112,000 23,501,000 20,610,000 12,633,000 22,256,000 7,831,000 9,012,000 8,516,000 9,542,000 6,689,000 5,914,000 9,202,000 
        restricted funds
      19,000,000 21,000,000 11,000,000 17,000,000 18,000,000 29,000,000 40,000,000 50,000,000 42,000,000 34,000,000 33,000,000 30,000,000 29,000,000 32,000,000 27,000,000 26,000,000 21,000,000 20,000,000 30,000,000 34,000,000 30,000,000 29,000,000 39,000,000 36,000,000 33,000,000 31,000,000 22,000,000 22,000,000 22,000,000 28,000,000 29,000,000 27,000,000  26,000,000 27,000,000 28,000,000 28,000,000 23,000,000 20,000,000 23,000,000 23,000,000 22,000,000 21,000,000 23,480,000 20,838,000 21,027,000 13,859,000 20,040,000 21,537,000 28,585,000 28,505,000 25,429,000 19,720,000 31,623,000 29,756,000 87,705,000 98,698,000 27,418,000 32,438,000 46,864,000 65,055,000 80,443,000 94,066,000 99,974,000 93,705,000 40,273,000 41,020,000 38,933,000 33,007,000 1,446,000 454,000 902,000 1,874,000 2,149,000 
        accounts receivable
      386,000,000 395,000,000 459,000,000 424,000,000 380,000,000 416,000,000 453,000,000 393,000,000 323,000,000 339,000,000 382,000,000 352,000,000 318,000,000 334,000,000 358,000,000 383,000,000 266,000,000 271,000,000 348,000,000 311,000,000 274,000,000 321,000,000 358,000,000 298,000,000 292,000,000 294,000,000 335,000,000 337,000,000 307,000,000 301,000,000 347,000,000 324,000,000 23,000,000 273,000,000 272,000,000 312,000,000 288,000,000 250,000,000 269,000,000 302,000,000 240,000,000 220,000,000 255,000,000 341,686,000 281,195,000 267,204,000 267,053,000 284,273,000 277,780,000 259,306,000 244,568,000 288,788,000 263,120,000 208,276,000 221,655,000                    
        income tax receivable
      112,000,000 9,000,000 3,000,000 25,000,000 23,000,000 25,000,000 7,000,000 17,000,000 26,000,000 86,000,000 54,000,000 74,000,000 96,000,000 114,000,000                                                             
        unbilled revenues
      451,000,000 433,000,000 437,000,000 434,000,000 332,000,000 315,000,000 310,000,000 337,000,000 316,000,000 302,000,000 318,000,000 331,000,000 289,000,000 275,000,000 273,000,000 284,000,000 254,000,000 248,000,000 249,000,000 254,000,000 219,000,000 206,000,000 201,000,000 207,000,000 172,000,000 172,000,000 187,000,000 179,000,000 170,000,000 186,000,000 203,000,000 212,000,000  188,000,000 212,000,000 234,000,000 236,000,000 227,000,000 263,000,000 285,000,000 286,000,000 247,000,000 267,000,000 289,577,000 265,347,000 222,111,000 220,538,000 227,037,000 224,581,000 193,269,000 217,147,000 209,865,000 196,176,000 170,742,000 180,628,000                    
        materials and supplies
      114,000,000 112,000,000 109,000,000 109,000,000 107,000,000 103,000,000 105,000,000 111,000,000 115,000,000 112,000,000 111,000,000 109,000,000 103,000,000 98,000,000 93,000,000 85,000,000 71,000,000 57,000,000 53,000,000 52,000,000 52,000,000 47,000,000 49,000,000 51,000,000 50,000,000 44,000,000 46,000,000 48,000,000 44,000,000 41,000,000 42,000,000 42,000,000  42,000,000 41,000,000 42,000,000 41,000,000 41,000,000 39,000,000 40,000,000 42,000,000 41,000,000 38,000,000 37,965,000 38,332,000 38,622,000 37,190,000 37,203,000 36,845,000 35,242,000 32,973,000 35,053,000 33,819,000 31,150,000 29,772,000 31,925,000 31,712,000 30,355,000 28,598,000 30,491,000 31,414,000 30,606,000 28,867,000 31,345,000 29,908,000 30,089,000 29,521,000 30,835,000 32,869,000 32,811,000 28,948,000 32,949,000 31,679,000 28,961,000 
        secured seller promissory note from the sale of the homeowner services group
       795,000,000 795,000,000 795,000,000 795,000,000 795,000,000 795,000,000 795,000,000 795,000,000                                                                  
        other
      305,000,000 328,000,000 367,000,000 296,000,000 220,000,000 231,000,000 195,000,000 209,000,000 181,000,000 186,000,000 278,000,000 299,000,000 290,000,000 312,000,000 189,000,000 169,000,000 166,000,000 159,000,000 162,000,000 183,000,000 168,000,000 127,000,000 142,000,000 137,000,000 119,000,000 118,000,000 115,000,000 91,000,000 85,000,000 95,000,000 93,000,000 160,000,000  145,000,000 113,000,000 151,000,000 151,000,000 148,000,000 118,000,000 105,000,000 48,000,000 42,000,000 31,000,000 31,781,000 41,505,000 63,393,000 45,414,000 28,744,000 27,193,000 31,604,000 28,408,000 38,765,000 31,085,000 41,166,000 30,483,000 80,888,000 57,579,000 62,796,000 54,134,000 71,151,000 74,940,000 61,906,000 48,185,000 53,415,000 57,208,000 63,164,000 52,680,000 56,330,000 58,348,000 56,557,000 45,096,000 45,268,000 50,984,000 47,523,000 
        total current assets
      1,524,000,000 2,191,000,000 1,552,000,000 1,399,000,000 1,194,000,000 1,215,000,000 1,237,000,000 1,165,000,000 1,587,000,000 1,389,000,000 1,804,000,000 1,989,000,000 1,338,000,000 1,250,000,000 1,017,000,000 1,018,000,000 853,000,000 1,554,000,000 1,590,000,000 1,570,000,000 1,466,000,000 1,906,000,000 1,967,000,000 1,896,000,000 1,801,000,000 1,285,000,000 799,000,000 741,000,000 691,000,000 781,000,000 800,000,000 833,000,000  729,000,000 720,000,000 860,000,000 808,000,000 767,000,000 784,000,000 801,000,000 691,000,000 638,000,000 657,000,000 879,009,000 890,085,000 729,019,000 661,369,000 756,961,000 707,635,000 687,994,000 550,390,000 613,220,000 545,840,000 491,850,000 499,447,000 642,525,000 606,374,000 589,109,000 1,397,659,000 1,479,461,000 1,493,214,000 1,305,539,000 534,307,000 627,399,000 590,113,000 497,228,000 499,127,000 516,471,000 495,705,000 420,588,000 417,675,000 497,224,000 458,672,000 414,874,000 
        regulatory and other long-term assets:
                                                                                
        regulatory assets
      1,138,000,000 1,132,000,000 1,179,000,000 1,178,000,000 1,162,000,000 1,150,000,000 1,119,000,000 1,138,000,000 1,117,000,000 1,106,000,000 1,039,000,000 1,020,000,000 1,004,000,000 990,000,000 1,075,000,000 1,053,000,000 1,049,000,000 1,051,000,000 1,128,000,000 1,145,000,000 1,127,000,000 1,127,000,000 1,144,000,000 1,144,000,000 1,132,000,000 1,128,000,000 1,178,000,000 1,180,000,000 1,161,000,000 1,156,000,000 1,086,000,000 1,069,000,000  1,062,000,000 1,061,000,000 1,374,000,000 1,324,000,000 1,298,000,000 1,289,000,000 1,223,000,000 1,306,000,000 1,289,000,000 1,271,000,000 1,230,633,000 1,195,231,000 1,151,849,000 1,153,429,000 874,828,000 848,352,000 847,788,000 858,465,000 1,232,447,000 1,223,492,000 1,207,967,000 1,199,114,000 1,134,260,000 1,139,223,000 1,090,003,000 1,079,661,000 997,511,000 989,932,000 991,797,000 1,016,007,000 1,011,554,000 1,003,769,000 987,963,000 952,020,000 956,349,000 945,572,000 938,397,000 919,654,000 628,050,000 631,497,000 626,093,000 
        operating lease right-of-use assets
      82,000,000 85,000,000 87,000,000 89,000,000 87,000,000 89,000,000 89,000,000 90,000,000 90,000,000 86,000,000 86,000,000 83,000,000 83,000,000 82,000,000 90,000,000 91,000,000 91,000,000 92,000,000 95,000,000 94,000,000 98,000,000 95,000,000 97,000,000 99,000,000 101,000,000 103,000,000 109,000,000 112,000,000 116,000,000                                              
        goodwill
      1,156,000,000 1,156,000,000 1,151,000,000 1,151,000,000 1,144,000,000 1,144,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,143,000,000 1,139,000,000 1,139,000,000 1,511,000,000 1,511,000,000 1,511,000,000 1,504,000,000 1,504,000,000 1,506,000,000 1,499,000,000 1,501,000,000 1,576,000,000 1,575,000,000 1,575,000,000 1,575,000,000 1,571,000,000 1,621,000,000 242,000,000 1,379,000,000 1,379,000,000 1,373,000,000 1,373,000,000 1,345,000,000 1,345,000,000 1,313,000,000 1,313,000,000 1,313,000,000 1,302,000,000 1,312,888,000 1,209,841,000 1,208,043,000 1,208,043,000 1,208,065,000 1,208,065,000 1,208,065,000 1,207,764,000 1,207,741,000 1,207,336,000 1,207,161,000 1,207,250,000 1,207,572,000 1,207,572,000 1,195,069,000 1,195,069,000 1,195,510,000 1,195,510,000 1,204,227,000 1,250,692,000 1,250,692,000 1,250,692,000 1,250,417,000 1,250,381,000 1,250,067,000 1,250,067,000 1,249,839,000 1,699,517,000 1,704,310,000 1,706,675,000 1,706,952,000 
        total regulatory and other long-term assets
      2,667,000,000 2,675,000,000 3,584,000,000 3,582,000,000 3,585,000,000 3,577,000,000 3,546,000,000 3,518,000,000 3,476,000,000 3,471,000,000 3,326,000,000 3,319,000,000 3,316,000,000 3,314,000,000 3,473,000,000 3,454,000,000 3,443,000,000 3,437,000,000 3,158,000,000 3,168,000,000 3,154,000,000 3,150,000,000 3,160,000,000 3,169,000,000 3,157,000,000 3,165,000,000 3,288,000,000 3,315,000,000 3,150,000,000 3,033,000,000 3,017,000,000 2,861,000,000  2,522,000,000 2,516,000,000 2,820,000,000 2,767,000,000 2,715,000,000 2,706,000,000 2,611,000,000 2,698,000,000 2,681,000,000 2,651,000,000 2,620,654,000 2,484,266,000 2,435,945,000 2,440,291,000 2,159,328,000 2,136,301,000 2,116,846,000 2,127,981,000 2,502,659,000 2,503,667,000 2,484,431,000 2,480,165,000 2,422,683,000 2,419,076,000 2,359,131,000 2,357,634,000 2,271,428,000 2,254,060,000 2,267,570,000 2,343,849,000 2,342,929,000 2,311,080,000 2,300,917,000 2,276,131,000 2,297,107,000 2,298,652,000 2,249,339,000 2,690,215,000 2,411,917,000 2,446,419,000 2,437,075,000 
        total assets
      35,264,000,000 35,442,000,000 34,748,000,000 33,913,000,000 33,156,000,000 32,830,000,000 31,790,000,000 31,215,000,000 31,086,000,000 30,298,000,000 29,818,000,000 29,496,000,000 28,286,000,000 27,787,000,000 27,126,000,000 26,574,000,000 25,694,000,000 26,075,000,000 25,333,000,000 24,952,000,000 24,525,000,000 24,766,000,000 24,394,000,000 24,009,000,000 23,546,000,000 22,682,000,000 22,238,000,000 21,854,000,000 21,464,000,000 21,223,000,000 20,880,000,000 20,471,000,000  19,728,000,000 19,482,000,000 19,361,000,000 18,966,000,000 18,610,000,000 18,482,000,000 17,971,000,000 17,706,000,000 17,417,000,000 17,241,000,000 17,105,173,000 16,732,332,000 16,263,531,000 16,130,956,000 15,715,647,000 15,426,447,000 15,274,821,000 15,069,533,000 15,228,446,000 14,977,377,000 14,769,216,000 14,718,976,000 14,599,535,000 14,412,761,000 14,087,739,000 14,776,391,000 14,538,733,000 14,347,216,000 14,128,807,000 14,079,773,000 13,983,675,000 13,773,516,000 13,540,562,000 13,452,651,000 13,345,709,000 13,190,049,000 12,907,244,000 13,231,818,000 12,780,732,000 12,526,682,000 12,268,004,000 
        capitalization and liabilities
                                                                                
        capitalization:
                                                                                
        common stock
      2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000  2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 1,807,000 1,801,000 1,799,000 1,795,000 1,793,000 1,791,000 1,790,000 1,784,000 1,781,000 1,779,000 1,777,000 1,770,000 1,767,000 1,763,000 1,762,000 1,757,000 1,755,000 1,754,000 1,753,000 1,750,000 1,749,000 1,747,000 1,747,000 1,746,000 1,746,000 1,746,000 1,600,000 1,600,000    
        paid-in-capital
      8,652,000,000 8,642,000,000 8,630,000,000 8,621,000,000 8,611,000,000 8,598,000,000 8,588,000,000 8,578,000,000 8,561,000,000 8,550,000,000 8,541,000,000 8,529,000,000 8,519,000,000 6,824,000,000 6,813,000,000 6,804,000,000 6,796,000,000 6,781,000,000 6,772,000,000 6,765,000,000 6,757,000,000 6,747,000,000 6,739,000,000 6,730,000,000 6,713,000,000 6,700,000,000 6,695,000,000 6,683,000,000 6,668,000,000 6,657,000,000 6,647,000,000 6,637,000,000  6,438,000,000 6,432,000,000 6,423,000,000 6,416,000,000 6,400,000,000 6,388,000,000 6,388,000,000 6,382,000,000 6,368,000,000 6,351,000,000 6,348,609,000 6,324,039,000 6,313,242,000 6,301,729,000 6,297,187,000 6,290,402,000 6,272,277,000 6,261,396,000 6,251,286,000 6,243,851,000 6,232,815,000  6,213,038,000 6,198,594,000 6,192,426,000  6,173,781,000 6,170,047,000 6,164,883,000  6,151,349,000 6,146,444,000 6,142,663,000  6,137,771,000 6,135,650,000 5,890,767,000     
        retained earnings
      2,771,000,000 2,575,000,000 2,662,000,000 2,445,000,000 2,317,000,000 2,112,000,000 2,172,000,000 1,971,000,000 1,844,000,000 1,659,000,000 1,764,000,000 1,580,000,000 1,437,000,000 1,267,000,000 1,359,000,000 1,181,000,000 1,083,000,000 925,000,000 500,000,000 332,000,000 235,000,000 102,000,000 157,000,000                                                    
        accumulated other comprehensive income
      8,000,000 6,000,000 4,000,000 5,000,000 2,000,000 12,000,000                                            -35,151,000 -34,635,000                        
        treasury stock
      -396,000,000 -388,000,000 -391,000,000 -391,000,000 -398,000,000 -392,000,000 -392,000,000 -392,000,000 -392,000,000 -388,000,000 -388,000,000 -388,000,000 -388,000,000 -377,000,000 -377,000,000 -377,000,000 -377,000,000 -365,000,000 -363,000,000 -363,000,000 -363,000,000 -348,000,000 -348,000,000 -348,000,000 -348,000,000 -338,000,000 -338,000,000 -338,000,000 -338,000,000 -297,000,000 -297,000,000 -297,000,000  -297,000,000 -247,000,000 -247,000,000 -247,000,000 -274,000,000 -213,000,000 -214,000,000 -214,000,000 -210,000,000 -143,000,000 -56,124,000 -30,051,000 -16,592,000 -10,516,000 -10,222,000 -10,222,000 -10,020,000 -5,043,000 -5,043,000 -5,043,000 -5,043,000         -19,000     -1,000   -7,000    
        total common shareholders' equity
      11,037,000,000 10,837,000,000 10,907,000,000 10,682,000,000 10,534,000,000 10,332,000,000 10,362,000,000 10,152,000,000 10,007,000,000 9,797,000,000 9,897,000,000 9,701,000,000 9,547,000,000 7,693,000,000 7,758,000,000 7,570,000,000 7,460,000,000 7,298,000,000 6,866,000,000 6,690,000,000 6,583,000,000 6,454,000,000 6,512,000,000 6,338,000,000 6,243,000,000 6,121,000,000 6,190,000,000 6,027,000,000 5,932,000,000 5,864,000,000                                             
        long-term debt
      12,766,000,000 12,777,000,000 13,022,000,000 12,278,000,000 13,318,000,000 12,518,000,000 12,550,000,000 12,553,000,000 12,566,000,000 11,715,000,000 11,698,000,000 11,607,000,000 10,485,000,000 10,926,000,000 10,940,000,000 11,023,000,000 10,347,000,000 10,341,000,000 10,349,000,000 10,343,000,000 9,325,000,000 9,329,000,000 9,580,000,000 9,589,000,000 8,621,000,000 8,639,000,000 8,640,000,000 8,642,000,000 7,562,000,000 7,569,000,000 7,570,000,000 6,345,000,000  6,396,000,000 6,490,000,000 6,672,000,000 5,650,000,000 5,744,000,000 5,749,000,000 5,842,000,000 5,850,000,000 5,850,000,000 5,862,000,000 5,940,615,000 5,433,239,000 5,428,901,000 5,432,744,000 5,540,648,000 5,217,544,000 5,208,668,000 5,212,881,000 5,174,077,000 5,180,682,000 5,184,943,000 5,190,509,000 5,184,546,000 5,203,133,000 5,350,514,000 5,339,947,000 5,361,531,000 5,362,604,000 5,362,325,000 5,410,271,000 5,371,548,000 5,305,167,000 5,256,955,000 5,288,180,000 5,197,710,000 4,981,912,000 4,659,806,000 4,624,063,000 4,669,502,000 4,696,260,000 4,642,315,000 
        redeemable preferred stock at redemption value
      3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 2,000,000 2,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 4,000,000 4,000,000 4,000,000 4,000,000 5,000,000 6,000,000 6,000,000 6,000,000 7,000,000 7,000,000 7,000,000  7,000,000 8,000,000 9,000,000 9,000,000 9,000,000 10,000,000 11,000,000 11,000,000 11,000,000 12,000,000 14,286,000 14,291,000 14,296,000 15,501,000 15,958,000 15,964,000 15,971,000 17,177,000 17,635,000 17,644,000 17,652,000 18,861,000 19,321,000 19,275,000 19,280,000 21,137,000 21,984,000 22,123,000 23,267,000 23,271,000 23,802,000 23,938,000 23,947,000 23,946,000 24,025,000 24,154,000 24,153,000 24,150,000 24,217,000 24,333,000 24,296,000 
        total long-term debt
      12,769,000,000 12,780,000,000 13,025,000,000 12,281,000,000 13,321,000,000 12,521,000,000 12,553,000,000 12,556,000,000 12,569,000,000 11,718,000,000 11,701,000,000 11,609,000,000 10,487,000,000 10,929,000,000 10,943,000,000 11,026,000,000 10,350,000,000 10,344,000,000 10,352,000,000 10,346,000,000 9,328,000,000 9,333,000,000 9,584,000,000 9,593,000,000 8,625,000,000 8,644,000,000 8,646,000,000 8,648,000,000 7,568,000,000 7,576,000,000 7,577,000,000 6,352,000,000  6,403,000,000 6,498,000,000 6,681,000,000 5,659,000,000 5,753,000,000 5,759,000,000 5,853,000,000 5,861,000,000 5,861,000,000                                 
        total capitalization
      23,806,000,000 23,617,000,000 23,932,000,000 22,963,000,000 23,855,000,000 22,853,000,000 22,915,000,000 22,708,000,000 22,576,000,000 21,515,000,000 21,598,000,000 21,310,000,000 20,034,000,000 18,622,000,000 18,701,000,000 18,596,000,000 17,810,000,000 17,642,000,000 17,218,000,000 17,036,000,000 15,911,000,000 15,787,000,000 16,096,000,000 15,931,000,000 14,868,000,000 14,765,000,000 14,836,000,000 14,675,000,000 13,500,000,000 13,440,000,000 13,437,000,000 12,088,000,000  11,854,000,000 11,883,000,000 12,199,000,000 11,043,000,000 11,040,000,000 10,977,000,000 11,091,000,000 11,014,000,000 10,943,000,000 10,923,000,000 11,120,353,000 10,500,920,000 10,436,135,000 10,363,836,000 10,476,258,000 10,106,634,000 10,025,726,000 9,957,862,000 9,824,644,000 9,770,452,000 9,712,257,000 9,654,358,000 9,653,207,000 9,548,383,000 9,625,230,000 9,601,468,000 9,646,705,000 9,547,194,000 9,536,246,000 9,565,814,000 9,531,103,000 9,372,971,000 9,284,393,000 9,317,542,000 9,213,544,000 8,938,829,000 8,348,857,000 8,754,771,000 8,860,633,000 8,828,055,000 8,480,602,000 
        current liabilities:
                                                                                
        short-term debt
      1,366,000,000 1,588,000,000 1,005,000,000 1,589,000,000 999,000,000 879,000,000 215,000,000   179,000,000    1,175,000,000 634,000,000 420,000,000 321,000,000 584,000,000 684,000,000 606,000,000 1,115,000,000 1,282,000,000 1,044,000,000 920,000,000 1,641,000,000 786,000,000 474,000,000 397,000,000 1,201,000,000 964,000,000 564,000,000 1,649,000,000  1,183,000,000 905,000,000 103,000,000 1,117,000,000 980,000,000 849,000,000 951,000,000 950,000,000 839,000,000 628,000,000 379,944,000 820,982,000 544,531,000 449,959,000 313,979,000 702,438,000 638,227,000 630,307,000 389,435,000 466,462,000 333,786,000 269,985,000 297,859,000 361,972,000 147,212,000 515,050,000 408,998,000 449,940,000 323,484,000 229,699,000 181,841,000 265,807,000 147,893,000 119,497,000 76,556,000 268,751,000 645,092,000 479,010,000 327,185,000 243,418,000 368,137,000 
        current portion of long-term debt
      1,494,000,000 1,479,000,000 1,269,000,000 1,119,000,000 114,000,000 637,000,000 585,000,000 575,000,000 557,000,000 475,000,000 492,000,000 579,000,000 727,000,000 281,000,000 265,000,000 178,000,000 57,000,000 57,000,000 48,000,000 49,000,000 311,000,000 329,000,000 67,000,000 69,000,000 49,000,000 28,000,000 29,000,000 25,000,000 68,000,000 71,000,000 263,000,000 364,000,000  421,000,000 322,000,000 687,000,000 686,000,000 574,000,000 574,000,000 53,000,000 54,000,000 54,000,000 54,000,000 22,023,000 61,962,000 61,149,000 61,132,000 55,581,000 15,030,000 14,901,000 14,174,000 113,661,000 113,864,000 115,924,000 115,919,000 34,964,000 120,289,000 30,126,000 28,858,000 8,949,000 8,439,000 12,168,000 44,760,000 43,984,000 44,018,000 47,027,000 54,068,000 54,325,000 97,357,000 62,499,000 175,822,000 95,836,000 80,534,000 90,188,000 
        accounts payable
      272,000,000 378,000,000 302,000,000 306,000,000 240,000,000 346,000,000 259,000,000 215,000,000 231,000,000 294,000,000 228,000,000 246,000,000 193,000,000 254,000,000 220,000,000 196,000,000 175,000,000 235,000,000 175,000,000 146,000,000 134,000,000 189,000,000 162,000,000 169,000,000 152,000,000 203,000,000 149,000,000 140,000,000 130,000,000 175,000,000 141,000,000 139,000,000  133,000,000 195,000,000 144,000,000 134,000,000 108,000,000 154,000,000 135,000,000 148,000,000 116,000,000 126,000,000 281,291,000 283,570,000 203,409,000 285,800,000 260,713,000 192,441,000 183,839,000 264,589,000 209,768,000 178,418,000 166,723,000 279,613,000 202,283,000 183,908,000 162,414,000 243,709,000 190,556,000 159,024,000 132,725,000 199,240,000 166,388,000 147,573,000 116,843,000 138,609,000 119,271,000 123,116,000 115,066,000 149,795,000 160,518,000 137,303,000 119,209,000 
        accrued liabilities
      580,000,000 830,000,000 630,000,000 569,000,000 539,000,000 791,000,000 585,000,000 607,000,000 636,000,000 791,000,000 605,000,000 575,000,000 561,000,000 706,000,000 610,000,000 593,000,000 538,000,000 701,000,000 520,000,000 506,000,000 466,000,000 591,000,000 505,000,000 512,000,000 476,000,000 596,000,000 490,000,000 429,000,000 406,000,000 556,000,000 455,000,000 530,000,000  495,000,000 630,000,000 498,000,000 490,000,000 453,000,000 609,000,000 530,000,000 377,000,000 368,000,000 493,000,000                                
        accrued taxes
      94,000,000 134,000,000 151,000,000 107,000,000 228,000,000 156,000,000 174,000,000 108,000,000 89,000,000 67,000,000 82,000,000 65,000,000 74,000,000 49,000,000 69,000,000 27,000,000 285,000,000 176,000,000 73,000,000 65,000,000 76,000,000 50,000,000 64,000,000 58,000,000 64,000,000 46,000,000 78,000,000 61,000,000 64,000,000                                              
        accrued interest
      135,000,000 140,000,000 139,000,000 119,000,000 131,000,000 111,000,000 129,000,000 113,000,000 131,000,000 93,000,000 124,000,000 91,000,000 114,000,000 91,000,000 116,000,000 93,000,000 102,000,000 88,000,000 103,000,000 89,000,000 98,000,000 88,000,000 101,000,000 90,000,000 91,000,000 84,000,000 96,000,000 88,000,000 83,000,000                                              
        total current liabilities
      4,118,000,000 4,747,000,000 3,687,000,000 3,991,000,000 2,447,000,000 3,150,000,000 2,132,000,000 1,825,000,000 1,857,000,000 2,151,000,000 1,743,000,000 1,764,000,000 1,892,000,000 2,811,000,000 2,130,000,000 1,728,000,000 1,648,000,000 2,141,000,000 1,844,000,000 1,710,000,000 2,451,000,000 2,881,000,000 2,260,000,000 2,113,000,000 2,767,000,000 2,045,000,000 1,488,000,000 1,317,000,000 2,156,000,000 2,094,000,000 1,748,000,000 2,951,000,000  2,539,000,000 2,325,000,000 1,747,000,000 2,661,000,000 2,418,000,000 2,392,000,000 1,928,000,000 1,740,000,000 1,614,000,000 1,533,000,000 1,165,387,000 1,512,188,000 1,227,548,000 1,240,998,000 1,058,935,000 1,234,911,000 1,197,699,000 1,235,533,000 1,141,473,000 1,049,306,000 958,332,000 994,832,000 1,005,874,000 1,017,964,000 743,689,000 1,489,105,000 1,380,014,000 1,327,646,000 1,134,880,000 774,506,000 741,424,000 753,437,000 661,089,000 607,392,000 600,631,000 792,787,000 1,169,208,000 1,104,760,000 937,490,000 741,239,000 871,474,000 
        regulatory and other long-term liabilities:
                                                                                
        advances for construction
      468,000,000 435,000,000 425,000,000 410,000,000 396,000,000 383,000,000 379,000,000 379,000,000 367,000,000 352,000,000 340,000,000 333,000,000 321,000,000 316,000,000 306,000,000 294,000,000 300,000,000 284,000,000 284,000,000 274,000,000 267,000,000 270,000,000 262,000,000 260,000,000 259,000,000 240,000,000 247,000,000 245,000,000 246,000,000 252,000,000 259,000,000 263,000,000  265,000,000 271,000,000 279,000,000 291,000,000 297,000,000 300,000,000 300,000,000 309,000,000 352,000,000 349,000,000 349,591,000 359,498,000 362,722,000 367,693,000 368,827,000 370,123,000 370,938,000 375,729,000 372,484,000 378,807,000 379,280,000 379,737,000 378,446,000 377,769,000 384,182,000 386,970,000 394,956,000 396,440,000 408,701,000 611,209,000 617,147,000 616,300,000 631,900,000 633,509,000 633,842,000 620,040,000 611,618,000 622,227,000 629,058,000 656,914,000 652,536,000 
        deferred income taxes and investment tax credits
      3,382,000,000 3,190,000,000 3,064,000,000 2,990,000,000 2,936,000,000 2,881,000,000 2,833,000,000 2,780,000,000 2,742,000,000 2,717,000,000 2,632,000,000 2,549,000,000 2,483,000,000 2,437,000,000 2,372,000,000 2,430,000,000 2,381,000,000 2,421,000,000 2,285,000,000 2,255,000,000 2,223,000,000 2,113,000,000 2,060,000,000 1,980,000,000 1,929,000,000 1,893,000,000 1,904,000,000 1,823,000,000 1,769,000,000                                              
        regulatory liabilities
      1,409,000,000 1,416,000,000 1,467,000,000 1,420,000,000 1,400,000,000 1,416,000,000 1,403,000,000 1,434,000,000 1,460,000,000 1,481,000,000 1,478,000,000 1,524,000,000 1,568,000,000 1,590,000,000 1,614,000,000 1,533,000,000 1,577,000,000 1,600,000,000 1,660,000,000 1,699,000,000 1,736,000,000 1,770,000,000 1,777,000,000 1,786,000,000 1,795,000,000 1,806,000,000 1,849,000,000 1,886,000,000 1,891,000,000 1,907,000,000 1,962,000,000 1,713,000,000  1,673,000,000 1,664,000,000 408,000,000 410,000,000 404,000,000 403,000,000 403,000,000 406,000,000 407,000,000 402,000,000 395,313,000 395,549,000 386,317,000 391,782,000 385,288,000 382,511,000 380,398,000 373,319,000 380,757,000 375,432,000 370,340,000 364,181,000 355,720,000 352,550,000 332,110,000 325,829,000 309,822,000 301,317,000 299,544,000 303,743,000 337,296,000 332,201,000 327,651,000 322,281,000 317,914,000 318,575,000 313,342,000 307,324,000    
        operating lease liabilities
      72,000,000 74,000,000 75,000,000 77,000,000 75,000,000 76,000,000 77,000,000 78,000,000 78,000,000 73,000,000 74,000,000 70,000,000 70,000,000 70,000,000 78,000,000 79,000,000 78,000,000 80,000,000 81,000,000 79,000,000 84,000,000 81,000,000 83,000,000 84,000,000 87,000,000 89,000,000 94,000,000 97,000,000 101,000,000                                              
        accrued pension expense
      160,000,000 167,000,000 203,000,000 207,000,000 212,000,000 217,000,000 243,000,000 251,000,000 256,000,000 262,000,000 201,000,000 209,000,000 215,000,000 235,000,000 250,000,000 262,000,000 276,000,000 285,000,000 346,000,000 357,000,000 368,000,000 388,000,000 386,000,000 397,000,000 404,000,000 411,000,000   394,000,000 390,000,000 393,000,000 397,000,000  390,000,000 384,000,000 421,000,000 422,000,000 420,000,000 419,000,000 342,000,000 341,000,000 342,000,000  317,927,000 318,647,000 317,444,000  90,026,000 98,672,000 103,342,000 108,542,000 434,031,000 435,525,000 448,563,000 461,647,000 375,726,000 391,162,000 391,458,000 411,998,000 340,951,000 386,664,000 392,944,000 422,386,000 388,876,000 417,052,000 417,242,000 431,010,000 490,813,000 500,342,000 501,983,000 502,062,000 253,244,000 260,391,000 275,536,000 
        total regulatory and other long-term liabilities
      5,695,000,000 5,448,000,000 5,514,000,000 5,359,000,000 5,271,000,000 5,250,000,000 5,174,000,000 5,122,000,000 5,098,000,000 5,081,000,000 4,938,000,000 4,889,000,000 4,849,000,000 4,850,000,000 4,806,000,000 4,775,000,000 4,787,000,000 4,850,000,000 4,836,000,000 4,786,000,000 4,761,000,000 4,705,000,000 4,647,000,000 4,582,000,000 4,549,000,000 4,517,000,000 4,569,000,000 4,525,000,000 4,476,000,000 4,367,000,000 4,383,000,000 4,134,000,000  4,048,000,000 3,998,000,000 4,151,000,000 4,024,000,000 3,927,000,000 3,895,000,000 3,754,000,000 3,765,000,000 3,720,000,000 3,664,000,000 3,706,771,000 3,620,614,000 3,518,588,000 3,451,250,000 3,113,233,000 3,030,574,000 3,004,483,000 2,833,434,000 3,246,497,000 3,149,975,000 3,096,219,000 3,073,650,000 2,946,441,000 2,857,655,000 2,745,429,000 2,719,070,000 2,560,418,000 2,531,557,000 2,525,326,000 2,722,991,000 2,700,816,000 2,644,979,000 2,615,990,000 2,554,437,000 2,569,867,000 2,515,810,000 2,466,527,000 2,460,872,000 2,104,311,000 2,090,908,000 2,082,165,000 
        contributions in aid of construction
      1,645,000,000 1,630,000,000 1,615,000,000 1,600,000,000 1,583,000,000 1,577,000,000 1,569,000,000 1,560,000,000 1,555,000,000 1,551,000,000 1,539,000,000 1,533,000,000 1,511,000,000 1,504,000,000 1,489,000,000 1,475,000,000 1,449,000,000 1,442,000,000 1,435,000,000 1,420,000,000 1,402,000,000 1,393,000,000 1,391,000,000 1,383,000,000 1,362,000,000 1,355,000,000 1,345,000,000 1,337,000,000 1,332,000,000 1,322,000,000 1,312,000,000 1,298,000,000  1,287,000,000 1,276,000,000 1,264,000,000 1,238,000,000 1,225,000,000 1,218,000,000 1,198,000,000 1,187,000,000 1,140,000,000 1,121,000,000 1,112,662,000 1,098,610,000 1,081,260,000 1,074,872,000 1,067,221,000 1,054,328,000 1,046,913,000 1,042,704,000 1,015,832,000 1,007,644,000 1,002,408,000 996,136,000 994,013,000 988,759,000 973,391,000 966,748,000 951,596,000 940,819,000 932,355,000 1,016,462,000 1,010,332,000 1,002,129,000 979,090,000 973,280,000 961,667,000 942,623,000 922,652,000 911,415,000 878,298,000 866,480,000 833,763,000 
        commitments and contingencies
                                                                                
        total capitalization and liabilities
      35,264,000,000 35,442,000,000 34,748,000,000 33,913,000,000 33,156,000,000 32,830,000,000 31,790,000,000 31,215,000,000 31,086,000,000 30,298,000,000 29,818,000,000 29,496,000,000 28,286,000,000 27,787,000,000 27,126,000,000 26,574,000,000 25,694,000,000 26,075,000,000 25,333,000,000 24,952,000,000 24,525,000,000 24,766,000,000 24,394,000,000 24,009,000,000 23,546,000,000 22,682,000,000 22,238,000,000 21,854,000,000 21,464,000,000 21,223,000,000 20,880,000,000 20,471,000,000  19,728,000,000 19,482,000,000 19,361,000,000 18,966,000,000 18,610,000,000 18,482,000,000 17,971,000,000 17,706,000,000 17,417,000,000 17,241,000,000 17,105,173,000 16,732,332,000 16,263,531,000 16,130,956,000 15,715,647,000 15,426,447,000 15,274,821,000 15,069,533,000 15,228,446,000 14,977,377,000 14,769,216,000 14,718,976,000 14,599,535,000 14,412,761,000 14,087,739,000 14,776,391,000 14,538,733,000 14,347,216,000 14,128,807,000 14,079,773,000 13,983,675,000 13,773,516,000 13,540,562,000 13,452,651,000 13,345,709,000 13,190,049,000 12,907,244,000 13,231,818,000 12,780,732,000 12,526,682,000 12,268,004,000 
        accumulated other comprehensive loss
            -8,000,000 -7,000,000 -8,000,000 -26,000,000 -22,000,000 -22,000,000 -23,000,000 -23,000,000 -39,000,000 -40,000,000 -44,000,000 -45,000,000 -45,000,000 -46,000,000 -48,000,000 -49,000,000 -38,000,000 -39,000,000 -41,000,000 -36,000,000 -46,000,000 -47,000,000 -47,000,000 -34,000,000 -60,000,000 -69,000,000  -75,000,000 -79,000,000 -87,000,000 -85,000,000 -82,000,000 -86,000,000 -99,000,000 -96,000,000 -87,000,000 -88,000,000 -79,175,000 -80,053,000 -81,503,000 -81,868,000 -35,942,000 -34,671,000   -109,901,000 -112,468,000 -114,286,000 -116,191,000 -91,507,000 -93,890,000 -95,549,000 -97,677,000 -68,555,000 -68,696,000 -69,958,000 -71,446,000 -61,086,000 -62,546,000 -63,203,000 -64,677,000 -76,344,000 -78,357,000 -81,281,000 -82,251,000    
        seller promissory note from the sale of the homeowner services group
               720,000,000 720,000,000 720,000,000 720,000,000 720,000,000 720,000,000 720,000,000 720,000,000 720,000,000                                                         
        assets held for sale
                       683,000,000 678,000,000 666,000,000 654,000,000 629,000,000 618,000,000 598,000,000 579,000,000 566,000,000                                                 
        postretirement benefit assets
                    208,000,000 207,000,000 203,000,000 193,000,000 175,000,000 168,000,000 167,000,000 173,000,000 155,000,000 158,000,000 158,000,000  150,000,000 168,000,000                                               
        liabilities related to assets held for sale
                       83,000,000 78,000,000 79,000,000 80,000,000 137,000,000 138,000,000 133,000,000 130,000,000 128,000,000                                                 
        intangible assets
                        47,000,000 50,000,000 52,000,000 55,000,000 58,000,000 61,000,000 64,000,000 67,000,000 74,000,000 78,000,000 80,000,000 84,000,000 91,000,000 101,000,000 96,000,000                                          
        accumulated deficit
                             -7,000,000 -83,000,000 -207,000,000 -123,000,000 -273,000,000 -353,000,000 -464,000,000 -432,000,000 -537,000,000  -617,000,000 -723,000,000 -573,000,000 -702,000,000 -759,000,000 -873,000,000 -839,000,000 -921,000,000 -991,000,000 -1,073,000,000 -1,049,665,000 -1,162,346,000 -1,224,008,000 -1,295,549,000 -1,333,164,000 -1,374,174,000 -1,427,809,000 -1,495,698,000 -1,505,191,000 -1,555,993,000 -1,607,321,000 -1,664,955,000 -1,675,678,000 -1,785,039,000 -1,847,750,000 -1,848,801,000 -1,848,338,000 -1,945,185,000 -1,950,571,000 -1,959,235,000 -1,960,806,000 -2,046,326,000 -2,082,263,000 -2,076,287,000 -2,075,920,000 -2,130,833,000 -2,150,745,000 -1,705,594,000    
        postretirement benefit asset
                               159,000,000   161,000,000 155,000,000 193,000,000                                            
        accrued pension liabilities
                                399,000,000 398,000,000                                               
        taxes accrued
                                   45,000,000 67,000,000 48,000,000  64,000,000 33,000,000 61,000,000 47,000,000 67,000,000 31,000,000 45,000,000 39,000,000 58,000,000 26,000,000 46,336,000 41,141,000 55,714,000 24,505,000 46,945,000 37,579,000 54,129,000 32,400,000 46,268,000 37,431,000 51,152,000 35,555,000 43,670,000 39,122,000 59,137,000 36,606,000                
        interest accrued
                                   87,000,000 89,000,000 69,000,000  84,000,000 73,000,000 103,000,000 62,000,000 101,000,000 63,000,000 96,000,000 61,000,000 96,000,000 62,000,000 97,038,000 55,992,000 94,934,000 56,523,000 97,062,000 55,545,000 93,655,000 52,087,000 101,291,000 54,531,000 101,101,000 53,810,000 106,074,000 57,406,000 103,037,000 59,067,000 103,184,000 59,156,000 103,622,000 60,874,000 103,119,000 59,997,000 103,935,000 60,128,000 98,080,000 56,152,000 90,905,000 53,629,000 91,271,000 53,720,000 85,248,000 
        deferred income taxes
                                   1,718,000,000 1,670,000,000 1,617,000,000  1,585,000,000 1,551,000,000 2,862,000,000 2,723,000,000 2,629,000,000 2,596,000,000 2,524,000,000 2,430,000,000 2,358,000,000 2,310,000,000 114,796,000 130,168,000 119,839,000 86,601,000 104,251,000 119,144,000 134,833,000 1,822,088,000 1,744,330,000 1,639,696,000 1,518,408,000 1,471,153,000 1,534,741,000 1,434,201,000 1,332,331,000 1,288,797,000 1,235,554,000 1,163,854,000 1,136,432,000 1,093,055,000 1,050,293,000 968,969,000 924,763,000 851,677,000 811,790,000 757,967,000 719,872,000 705,587,000 720,569,000 658,481,000 644,343,000 
        deferred investment tax credits
                                   22,000,000 21,000,000 22,000,000  22,000,000 22,000,000 23,000,000 23,000,000 23,000,000 23,000,000 23,000,000 23,000,000 23,000,000 24,000,000 24,001,000 24,339,000 24,676,000 25,014,000 25,362,000 25,711,000 26,059,000 26,408,000 26,783,000 27,158,000 27,533,000 27,909,000 28,288,000 28,668,000 29,047,000 29,427,000 29,813,000 30,198,000 30,588,000 31,023,000 31,415,000 31,807,000 32,198,000 32,590,000 32,819,000 33,220,000 33,622,000 34,023,000 34,148,000 34,553,000 34,957,000 
        accrued postretirement benefit expense
                                        40,000,000 84,000,000 85,000,000 86,000,000 87,000,000 72,000,000 167,000,000 168,000,000  189,692,000 190,485,000 191,689,000  88,338,000 88,362,000 88,385,000 88,419,000 251,637,000 252,476,000 253,318,000 254,147,000 233,810,000 234,678,000 236,286,000 237,086,000 212,357,000 213,375,000 214,816,000 215,751,000 230,214,000 232,129,000 234,182,000 236,045,000 235,243,000 237,268,000 239,294,000 241,193,000 151,899,000 153,975,000 156,178,000 
        total common stockholders' equity
                                    5,860,000,000 5,736,000,000  5,451,000,000 5,385,000,000 5,518,000,000 5,384,000,000 5,287,000,000 5,218,000,000 5,238,000,000 5,153,000,000 5,082,000,000 5,049,000,000 5,165,452,000 5,053,390,000 4,992,938,000 4,915,591,000 4,919,652,000 4,873,126,000 4,801,087,000                         
        accrued post-retirement benefit expense
                                     38,000,000  39,000,000                                         
        identifiable assets:
                                                                                
        other current assets
                                      1,000,000                                          
        total identifiable assets
                                      141,000,000                                          
        liabilities assumed:
                                                                                
        accounts payable and accrued liabilities
                                      -5,000,000                                          
        other current liabilities
                                      -3,000,000                                          
        non-current portion of warranty reserve
                                      -11,000,000                                          
        other long-term liabilities
                                      -1,000,000                                          
        total liabilities assumed
                                      -20,000,000                                          
        net identifiable assets acquired
                                      121,000,000                                          
        net assets acquired
                                      363,000,000                                          
        beginning balance as of december 31, 2017
                                      -140,000,000                                          
        other comprehensive income before reclassifications
                                                                                
        amounts reclassified from accumulated other comprehensive loss
                                                                                
        net other comprehensive income
                                                                                
        ending balance as of june 30, 2018
                                      -140,000,000                                          
        beginning balance as of december 31, 2016
                                      -147,000,000                                          
        ending balance as of june 30, 2017
                                      -147,000,000                                          
        accrued pension
                                                342,000,000    316,368,000                            
        accrued postretirement benefit
                                                169,000,000    192,502,000                            
        property plant and equipment
                                                                                
        utility plant—at original cost, net of accumulated depreciation of 4,219,736 at september 30 and 3,991,680 at december 31
                                                 13,468,478,000                               
        nonutility property, net of accumulated depreciation of 262,480 at september 30 and 248,341 at december 31
                                                 137,032,000                               
        total property, plant and equipment
                                                 13,605,510,000 13,357,981,000 13,098,567,000 13,029,296,000 12,799,358,000 12,582,511,000 12,469,981,000 12,391,162,000 12,112,567,000 11,927,870,000 11,792,935,000 11,739,364,000 11,534,327,000 11,387,311,000 11,139,499,000 11,021,098,000 10,787,844,000 10,599,942,000 10,555,698,000 11,201,617,000 11,013,347,000 10,872,323,000 10,742,417,000 10,677,393,000 10,532,131,000 10,395,692,000 10,237,317,000 10,123,928,000 9,871,591,000 9,621,591,000 9,416,055,000 
        current assets
                                                                                
        allowance for uncollectible accounts
                                                 -36,593,000 -35,518,000 -35,485,000 -34,941,000 -34,579,000 -37,868,000 -35,700,000 -33,953,000 -32,241,000 -28,268,000 -25,425,000 -26,874,000 -16,082,000 -13,140,000 -12,810,000 -15,319,000 -17,426,000 -16,617,000 -14,902,000 -18,043,000 -21,182,000 -20,401,000 -17,473,000 -19,035,000 -20,742,000 -19,946,000 -18,766,000 -18,644,000 -19,669,000 -18,144,000 -17,576,000 
        income taxes receivable
                                                 1,093,000 3,466,000 8,014,000 2,575,000 9,608,000 6,290,000 10,100,000 5,778,000 15,107,000 9,822,000 13,137,000 9,594,000 7,815,000 5,822,000 2,625,000 7,672,000 134,000 3,443,000 5,680,000  6,394,000 4,073,000 32,564,000         
        regulatory and other long-term assets
                                                                                
        capitalization
                                                                                
        current liabilities
                                                                                
        regulatory and other long-term liabilities
                                                                                
        utility plant—at original cost, net of accumulated depreciation of 4,144,789 at june 30 and 3,991,680 at december 31
                                                  13,244,298,000                              
        nonutility property, net of accumulated depreciation of 247,013 at june 30 and 248,341 at december 31
                                                  113,683,000                              
        utility plant—at original cost, net of accumulated depreciation of 4,062,270 at march 31 and 3,991,680 at december 31
                                                   12,985,631,000                             
        nonutility property, net of accumulated depreciation of 239,246 at march 31 and 248,341 at december 31
                                                   112,936,000                             
        utility plant—at original cost, net of accumulated depreciation of 3,991,680 in 2014 and 3,894,326 in 2013
                                                    12,899,704,000                            
        nonutility property, net of accumulated depreciation of 248,341 in 2014 and 215,083 in 2013
                                                    129,592,000                            
        assets of discontinued operations
                                                     6,256,000          137,505,000 929,858,000 943,155,000 937,202,000 801,184,000             
        liabilities of discontinued operations
                                                     1,667,000          32,781,000 382,218,000 388,157,000 380,688,000 330,840,000             
        utility plant—at original cost, net of accumulated depreciation of 4,010,604 at september 30 and 3,894,326 at december 31
                                                     12,668,123,000                           
        nonutility property, net of accumulated depreciation of 239,780 at september 30 and 215,083 at december 31
                                                     131,235,000                           
        utility plant—at original cost, net of accumulated depreciation of 3,965,888 at june 30 and 3,894,326 at december 31
                                                      12,445,097,000                          
        nonutility property, net of accumulated depreciation of 243,330 at june 30 and 228,465 at december 31
                                                      137,414,000                          
        utility plant—at original cost, net of accumulated depreciation of 3,956,852 at march 31 and 3,894,326 at december 31
                                                       12,328,427,000                         
        nonutility property, net of accumulated depreciation of 233,997 at march 31 and 228,465 at december 31
                                                       141,554,000                         
        utility plant—at original cost, net of accumulated depreciation of 3,894,326 in 2013 and 3,657,221 in 2012
                                                        12,244,359,000                        
        nonutility property, net of accumulated depreciation of 228,465 in 2013 and 199,467 in 2012
                                                        146,803,000                        
        common stockholders' equity
                                                        4,727,804,000                        
        preferred stock without mandatory redemption requirements
                                                           1,720,000 1,720,000 1,720,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,547,000 4,557,000 4,557,000 4,557,000 4,557,000 4,557,000 4,557,000 4,560,000 4,568,000 
        total stockholders' equity
                                                        4,727,804,000                        
        utility plant—at original cost, net of accumulated depreciation of 3,815,118 at september 30 and 3,657,221 at december 31
                                                         11,963,377,000                       
        nonutility property, net of accumulated depreciation of 223,953 at september 30 and 199,467 at december 31
                                                         149,190,000                       
        common stockholders’ equity
                                                         4,632,932,000 4,572,126,000 4,507,942,000 4,443,268,000 4,447,620,000 4,321,428,000 4,250,889,000 4,235,837,000 4,258,643,000 4,157,920,000 4,146,107,000 4,127,725,000 4,131,206,000 4,039,319,000 3,998,944,000 4,000,859,000 3,987,252,000 3,928,206,000 3,660,341,000 4,102,001,000 4,162,357,000 4,102,902,000  
        total stockholders’ equity
                                                         4,632,932,000 4,572,126,000 4,509,662,000 4,444,988,000 4,449,340,000 4,325,975,000 4,255,436,000 4,240,384,000 4,263,190,000 4,162,467,000 4,150,654,000 4,132,272,000 4,135,753,000 4,043,866,000 4,003,491,000 4,005,416,000 3,991,809,000 3,932,763,000 3,664,898,000     
        utility plant—at original cost, net of accumulated depreciation of 3,745,580 at june 30 and 3,657,221 at december 31
                                                          11,776,560,000                      
        nonutility property, net of accumulated depreciation of 215,183 at june 30 and 199,467 at december 31
                                                          151,310,000                      
        utility plant—at original cost, net of accumulated depreciation of 3,717,562 at march 31 and 3,657,221 at december 31
                                                           11,641,442,000                     
        nonutility property, net of accumulated depreciation of 207,858 at march 31 and 199,467 at december 31
                                                           151,493,000                     
        utility plant—at original cost, net of accumulated depreciation of 3,657,221 in 2012 and 3,360,005 in 2011
                                                            11,584,944,000                    
        nonutility property, net of accumulated depreciation of 199,467 in 2012 and 164,417 in 2011
                                                            154,420,000                    
        paid-in capital
                                                            6,222,644,000    6,180,558,000    6,156,675,000    6,140,077,000    5,888,253,000    
        utility plant—at original cost, net of accumulated depreciation of 3,591,216 at september 30 and 3,360,005 at december 31
                                                             11,380,259,000                   
        nonutility property, net of accumulated depreciation of 189,634 at september 30 and 164,417 at december 31
                                                             154,068,000                   
        utility customer accounts receivable
                                                             219,157,000 187,738,000 141,415,000 150,720,000 184,235,000 165,686,000 138,317,000 152,878,000 201,354,000 171,905,000 138,024,000 149,417,000 176,728,000 161,712,000 142,386,000 149,198,000 172,421,000 158,886,000 136,261,000 
        unbilled utility revenues
                                                             151,124,000 161,851,000 127,068,000 134,938,000 142,302,000 145,500,000 128,526,000 140,933,000 150,927,000 150,392,000 126,035,000 130,262,000 143,421,000 152,105,000 130,035,000 134,204,000 150,912,000 141,043,000 122,431,000 
        other receivables
                                                             61,462,000 63,195,000 63,235,000 60,413,000 62,934,000 73,125,000 60,251,000 74,309,000            
        utility plant—at original cost, net of accumulated depreciation of 3,526,087 at june 30 and 3,360,005 at december 31
                                                              11,233,630,000                  
        nonutility property, net of accumulated depreciation of 180,568 at june 30 and 164,417 at december 31
                                                              153,681,000                  
        utility plant—at original cost, net of accumulated depreciation of 3,419,284 at march 31 and 3,360,005 at december 31
                                                               10,991,185,000                 
        nonutility property, net of accumulated depreciation of 173,215 at march 31 and 164,417 at december 31
                                                               148,314,000                 
        utility plant—at original cost, net of accumulated depreciation of 3,360,005 in 2011 and 3,134,094 in 2010
                                                                10,872,042,000                
        nonutility property, net of accumulated depreciation of 164,417 in 2011 and 137,483 in 2010
                                                                149,056,000                
        utility plant—at original cost, net of accumulated depreciation of 3,299,029 at september 30 and 3,134,094 at december 31
                                                                 10,647,307,000               
        nonutility property, net of accumulated depreciation of 161,955 at september 30 and 142,902 at december 31
                                                                 140,537,000               
        taxes accrued, including income taxes of 0 at september 30 and december 31
                                                                 47,962,000               
        utility plant—at original cost, net of accumulated depreciation of 3,238,585 at june 30 and 3,134,094 at december 31
                                                                  10,463,211,000              
        nonutility property, net of accumulated depreciation of 161,703 at june 30 and 142,902 at december 31
                                                                  136,731,000              
        taxes accrued, including income taxes of 0 at june 30 and 906 at december 31
                                                                  47,475,000              
        utility plant—at original cost, net of accumulated depreciation of 3,229,600 at march 31 and 3,182,944 at december 31
                                                                   10,421,125,000             
        nonutility property, net of accumulated depreciation of 153,032 at march 31 and 143,051 at december 31
                                                                   134,573,000             
        taxes accrued, including income taxes of 0 at march 31 and december 31
                                                                   65,291,000             
        utility plant—at original cost, net of accumulated depreciation of 3,402,466 in 2010 and 3,168,078 in 2009
                                                                    11,058,565,000            
        nonutility property, net of accumulated depreciation of 143,051 in 2010 and 117,245 in 2009
                                                                    143,052,000            
        taxes accrued, including income taxes of 906 in 2010 and 1,777 in 2009
                                                                    46,710,000            
        utility plant—at original cost, net of accumulated depreciation of 3,349,819 at september 30 and 3,168,078 at december 31
                                                                     10,872,916,000           
        nonutility property, net of accumulated depreciation of 133,694 at september 30 and 117,245 at december 31
                                                                     140,431,000           
        non-regulated trade and other receivables
                                                                     81,671,000 82,713,000 71,919,000 75,086,000 70,485,000 63,823,000 67,603,000 68,877,000 75,222,000 62,528,000 62,812,000 
        taxes accrued, including income taxes of 0 at september 30 and 1,777 at december 31
                                                                     57,002,000           
        utility plant—at original cost, net of accumulated depreciation of 3,293,656 at june 30 and 3,168,078 at december 31
                                                                      10,730,114,000          
        nonutility property, net of accumulated depreciation of 125,422 at june 30 and 117,245 at december 31
                                                                      142,209,000          
        taxes accrued, including income taxes of 1,384 at june 30 and 1,777 at december 31
                                                                      54,906,000          
        utility plant—at original cost, net of accumulated depreciation of 3,221,026 at march 31 and 3,168,078 at december 31
                                                                       10,590,989,000         
        nonutility property, net of accumulated depreciation of 126,377 at march 31 and 117,245 at december 31
                                                                       151,428,000         
        taxes accrued, including income taxes of 0 at march 31 and 1,777 at december 31
                                                                       67,653,000         
        utility plant—at original cost, net of accumulated depreciation of 3,168,078 in 2009 and 2,969,869 in 2008
                                                                        10,523,844,000        
        nonutility property, net of accumulated depreciation of 117,245 in 2009 and 101,287 in 2008
                                                                        153,549,000        
        state income taxes receivable
                                                                        17,920,000 12,650,000 4,775,000      
        taxes accrued, including income taxes of 1,777 in 2009 and 6,061 in 2008
                                                                        45,552,000        
        utility plant—at original cost, net of accumulated depreciation of 3,120,547 at september 30 and 2,969,869 at december 31
                                                                         10,387,732,000       
        nonutility property, net of accumulated depreciation of 109,889 at september 30 and 101,287 at december 31
                                                                         144,399,000       
        taxes accrued, including income taxes of 3,798 at september 30 and 6,061 at december 31
                                                                         67,206,000       
        utility plant—at original cost, net of accumulated depreciation of 3,057,127 at june 30 and 2,969,869 at december 31
                                                                          10,255,426,000      
        nonutility property, net of accumulated depreciation of 101,542 at june 30 and 101,287 at december 31
                                                                          140,266,000      
        taxes accrued, including income taxes of 0 at june 30 and 6,061 at december 31
                                                                          60,371,000      
        utility plant—at original cost, net of accumulated depreciation of 3,026,830 at march 31 and 2,969,869 at december 31
                                                                           10,102,399,000     
        nonutility property, net of accumulated depreciation of 103,748 at march 31 and 101,287 at december 31
                                                                           134,918,000     
        taxes accrued, including income taxes of 3,208 at march 31 and 6,061 at december 31
                                                                           70,630,000     
        utility plant—at original cost, net of accumulated depreciation of 2,969,869 in 2008 and 2,776,950 in 2007
                                                                            9,991,783,000    
        nonutility property, net of accumulated depreciation of 101,287 in 2008 and 76,839 in 2007
                                                                            132,145,000    
        federal income taxes receivable
                                                                             32,530,000 23,908,000  
        taxes accrued, including income taxes of 6,061 in 2008 and 8,086 in 2007
                                                                            52,488,000    
        utility plant—at original cost, net of accumulated depreciation of 2,932,051 at september 30 and 2,776,950 at december 31
                                                                             9,742,671,000   
        nonutility property, net of accumulated depreciation of 81,561 at september 30 and 67,538 at december 31
                                                                             128,920,000   
        taxes accrued, including income taxes of 6,819 at september 30 and 8,086 at december 31
                                                                             65,928,000   
        regulatory liability-cost of removal
                                                                             197,910,000 209,963,000 202,019,000 
        utility plant—at original cost, net of accumulated depreciation of 2,891,826 at june 30 and 2,776,950 at december 31
                                                                              9,497,176,000  
        nonutility property, net of accumulated depreciation of 75,275 at june 30 and 67,538 at december 31
                                                                              124,415,000  
        taxes accrued, including income taxes of 3,546 at june 30 and 8,086 at december 31
                                                                              58,174,000  
        utility plant - at original cost, net of accumulated depreciation of 2,829,045 at march 31 and 2,776,950 at december 31
                                                                               9,296,315,000 
        nonutility property, net of accumulated depreciation of 63,207 at march 31 and 60,587 at december 31
                                                                               119,740,000 
        taxes receivable, including federal income
                                                                               23,111,000 
        common stockholder’s equity
                                                                               3,809,423,000 
        taxes accrued, including federal income
                                                                               56,536,000 
      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 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 
                                                                                 
          cash flows from operating activities
                                                                                 
          net income
        196,000,000 238,000,000 379,000,000 289,000,000 205,000,000 239,000,000 350,000,000 277,000,000 185,000,000 171,000,000 323,000,000 280,000,000 170,000,000 147,000,000 297,000,000 218,000,000 158,000,000 645,000,000 278,000,000 207,000,000 133,000,000 145,000,000 264,000,000 176,000,000 124,000,000 98,000,000 240,000,000 170,000,000 113,000,000 112,000,000 185,000,000 162,000,000 106,000,000 -1,000,000 203,000,000 131,000,000 93,000,000 101,000,000 148,000,000 137,000,000 82,000,000 98,988,000 173,894,000 123,075,000 80,043,000 93,501,000 152,185,000 109,299,000 68,123,000 59,693,000 150,665,000 101,263,000 57,643,000 55,478,000 153,812,000 107,026,000 41,754,000 40,293,000 137,422,000 84,566,000 47,332,000 40,154,000 124,114,000 72,751,000 30,808,000      88,158,000 45,498,000 -732,484,000 
          adjustments to reconcile to net cash flows from operating activities:
                                                                                 
          depreciation and amortization
        237,000,000 231,000,000 226,000,000 221,000,000 216,000,000 207,000,000 200,000,000 193,000,000 188,000,000 181,000,000 177,000,000 174,000,000 172,000,000 164,000,000 164,000,000 163,000,000 158,000,000 160,000,000 161,000,000 158,000,000 157,000,000 153,000,000 154,000,000 152,000,000 145,000,000 152,000,000 144,000,000 142,000,000 144,000,000 141,000,000 141,000,000 134,000,000 129,000,000 114,000,000 128,000,000 126,000,000 124,000,000 120,000,000 119,000,000 115,000,000 116,000,000 112,504,000 111,196,000 108,923,000 107,377,000 105,686,000 106,458,000 105,862,000 106,078,000 103,969,000 102,734,000 101,366,000 99,649,000 100,851,000 96,219,000 92,329,000 92,104,000 88,794,000 88,424,000 86,584,000 88,019,000 122,494,000 79,431,000 76,493,000 76,232,000 77,301,000 74,854,000 73,242,000 68,843,000 71,662,000 68,376,000 67,307,000 63,916,000 
          deferred income taxes and amortization of investment tax credits
        231,000,000 31,000,000 53,000,000 35,000,000 16,000,000 72,000,000 47,000,000 29,000,000 8,000,000 79,000,000 55,000,000 48,000,000 26,000,000 67,000,000 46,000,000 28,000,000 -61,000,000 109,000,000 57,000,000 38,000,000 26,000,000 33,000,000 78,000,000 58,000,000 38,000,000 45,000,000 78,000,000 50,000,000 35,000,000 53,000,000 60,000,000 49,000,000 33,000,000 198,000,000 127,000,000 73,000,000 64,000,000 59,000,000 89,000,000 82,000,000 52,000,000 59,985,000 108,567,000                               
          provision for losses on accounts receivable
        14,000,000 12,000,000 17,000,000 9,000,000 10,000,000 12,000,000 11,000,000 3,000,000 5,000,000 7,000,000 8,000,000 6,000,000 3,000,000 7,000,000 7,000,000 6,000,000 4,000,000 9,000,000 10,000,000 7,000,000 11,000,000 12,000,000 8,000,000 8,000,000 6,000,000 10,000,000 8,000,000 6,000,000 4,000,000 11,000,000 10,000,000 9,000,000 3,000,000 8,000,000 10,000,000 7,000,000 4,000,000 9,000,000 9,000,000 3,000,000 6,000,000 9,593,000 8,518,000 6,311,000 7,578,000  9,073,000 9,434,000 7,580,000  9,313,000 6,015,000 3,041,000                     
          pension and non-pension postretirement benefits
        -2,000,000 3,000,000 -2,000,000 -1,000,000 -1,000,000   -4,000,000 1,000,000 -4,000,000 1,000,000 -10,000,000 -12,000,000 -13,000,000 -12,000,000 -10,000,000 -10,000,000 -11,000,000 -10,000,000 -4,000,000 -6,000,000 -3,000,000 -1,000,000 4,000,000 4,000,000 4,000,000 5,000,000 4,000,000    13,000,000 15,000,000 14,000,000 15,000,000 11,000,000 12,000,000 16,000,000 15,000,000 15,027,000 15,324,000 15,325,000 15,324,000 6,017,000 6,018,000 6,020,000 6,018,000 19,517,000 19,516,000 19,518,000 19,518,000    20,141,000                 
          other non-cash
        -12,000,000 -24,000,000 30,000,000 -15,000,000 -21,000,000 23,000,000 38,000,000 -31,000,000 4,000,000 1,000,000 12,000,000 -4,000,000 -36,000,000 38,000,000 -29,000,000 1,000,000 -3,000,000 11,000,000 8,000,000 -1,000,000 -41,000,000 17,000,000 3,000,000 -22,000,000 -18,000,000 10,000,000 -5,000,000 -18,000,000 -28,000,000 -7,000,000 29,000,000 8,000,000 -10,000,000 -15,000,000 11,000,000 -32,000,000 -18,000,000 12,000,000 -16,000,000 -8,000,000 -24,000,000 -21,792,000 -19,040,000                               
          changes in assets and liabilities:
                                                                                 
          receivables and unbilled revenues
        -22,000,000 56,000,000 -55,000,000 -171,000,000 25,000,000 26,000,000 -37,000,000 -94,000,000 -2,000,000 53,000,000 -26,000,000 -82,000,000 -1,000,000 15,000,000 30,000,000 -153,000,000 -6,000,000 29,000,000 -45,000,000 -84,000,000 26,000,000 24,000,000 -67,000,000 -50,000,000 -4,000,000 29,000,000 -14,000,000 -45,000,000 5,000,000 53,000,000 -29,000,000 -61,000,000 20,000,000 55,000,000 -31,000,000 -54,000,000 51,000,000 52,000,000 -70,000,000 -62,000,000 49,000,000 62,543,000 -74,280,000 -63,505,000 -8,758,000 15,381,000 -23,578,000 -57,052,000 3,307,000 30,066,000 -44,697,000                       
          income tax receivable
        -103,000,000 -6,000,000   2,000,000 -18,000,000 10,000,000 9,000,000 60,000,000 -32,000,000 20,000,000                                                               
          pension contributions
        -11,000,000  -11,000,000 -11,000,000 -11,000,000  -11,000,000 -11,000,000 -11,000,000                                                                 
          accounts payable and accrued liabilities
        -164,000,000 99,000,000 57,000,000 72,000,000 -131,000,000 100,000,000 90,000,000 -18,000,000 -61,000,000 52,000,000 40,000,000 38,000,000 -60,000,000 1,000,000 54,000,000 47,000,000 -110,000,000 38,000,000 43,000,000 42,000,000 -57,000,000 15,000,000 11,000,000 63,000,000 -91,000,000 82,000,000 31,000,000 40,000,000 -87,000,000 48,000,000 31,000,000 19,000,000 -73,000,000 60,000,000 24,000,000 26,000,000 -72,000,000 -124,000,000 162,000,000 7,000,000 15,000,000                                 
          accrued taxes
        -37,000,000 -34,000,000 46,000,000 -115,000,000 73,000,000 -21,000,000 68,000,000 21,000,000 24,000,000 -16,000,000 18,000,000 -25,000,000 44,000,000 30,000,000 -2,000,000                                                           
          other assets and liabilities
        -22,000,000 76,000,000 -3,000,000 -11,000,000 -51,000,000 19,000,000 -86,000,000 -32,000,000 -18,000,000 50,000,000 19,000,000 -32,000,000 -24,000,000 25,000,000 22,000,000 -97,000,000 45,000,000 177,000,000 20,000,000 -6,000,000 -57,000,000 51,000,000 21,000,000 -19,000,000 -9,000,000 -27,000,000 -8,000,000 -24,000,000 -13,000,000 -10,000,000 49,000,000 -22,000,000 5,000,000 72,000,000 -5,000,000 -30,000,000 27,000,000  -27,000,000 -3,000,000 -49,000,000                                 
          net cash from operating activities
        305,000,000 663,000,000 764,000,000 301,000,000 331,000,000 639,000,000 679,000,000 345,000,000 382,000,000 527,000,000 633,000,000 429,000,000 285,000,000 344,000,000 568,000,000 42,000,000 154,000,000 412,000,000 509,000,000 341,000,000 179,000,000 438,000,000 457,000,000 351,000,000 180,000,000 438,000,000 465,000,000 312,000,000 168,000,000 394,000,000 467,000,000 306,000,000 219,000,000 463,000,000 462,000,000 247,000,000 277,000,000 351,000,000 407,000,000 271,000,000 247,000,000 323,382,000 437,623,000 219,376,000 198,619,000 257,025,000 389,647,000 205,741,000 244,874,000 207,486,000 398,479,000 140,572,000 149,625,000 220,584,000 418,143,000 168,772,000 148,099,000 232,313,000 313,648,000 100,870,000 161,526,000 187,906,000 289,518,000 121,519,000 175,990,000 124,605,000 242,843,000 86,209,000 142,499,000 159,256,000 251,638,000 55,884,000 85,391,000 
          cash flows from investing activities
                                                                                 
          capital expenditures
        -659,000,000 -1,048,000,000 -797,000,000 -733,000,000 -548,000,000 -894,000,000 -683,000,000 -670,000,000 -609,000,000 -796,000,000 -626,000,000 -627,000,000 -526,000,000 -700,000,000 -602,000,000 -571,000,000 -424,000,000 -559,000,000 -453,000,000 -410,000,000 -342,000,000 -508,000,000 -444,000,000 -462,000,000 -408,000,000 -539,000,000 -403,000,000 -386,000,000 -326,000,000 -450,000,000 -397,000,000 -375,000,000 -364,000,000 -470,000,000 -362,000,000 -332,000,000 -270,000,000 -383,000,000 -331,000,000 -313,000,000 -284,000,000 -368,921,000 -312,258,000 -252,410,000 -226,411,000 -291,260,000 -263,078,000 -209,315,000 -192,466,000 -314,990,000 -235,432,000 -216,744,000 -213,086,000 -248,217,000 -204,057,000 -242,934,000 -233,366,000 -302,918,000 -230,148,000 -215,381,000 -176,411,000 -243,546,000 -194,811,000 -184,597,000 -142,682,000 
          free cash flows
        -354,000,000 -385,000,000 -33,000,000 -432,000,000 -217,000,000 -255,000,000 -4,000,000 -325,000,000 -227,000,000 -269,000,000 7,000,000 -198,000,000 -241,000,000 -356,000,000 -34,000,000 -529,000,000 -270,000,000 -147,000,000 56,000,000 -69,000,000 -163,000,000 -70,000,000 13,000,000 -111,000,000 -228,000,000 -101,000,000 62,000,000 -74,000,000 -158,000,000 -56,000,000 70,000,000 -69,000,000 -145,000,000 -7,000,000 100,000,000 -85,000,000 7,000,000 -32,000,000 76,000,000 -42,000,000 -37,000,000 -45,539,000 125,365,000 -33,034,000 -27,792,000 -34,235,000 126,569,000 -3,574,000 52,408,000 -107,504,000 163,047,000 -76,172,000 -63,461,000 -27,633,000 214,086,000 -74,162,000 -85,267,000 -70,605,000 83,500,000 -114,511,000 -14,885,000 -55,640,000 94,707,000 -63,078,000 33,308,000 124,605,000 242,843,000 86,209,000 142,499,000 159,256,000 251,638,000 55,884,000 85,391,000 
          acquisitions, net of cash acquired
        -20,000,000 -49,000,000 -9,000,000 -10,000,000 -3,000,000 -298,000,000 -33,000,000 -86,000,000 -45,000,000 -3,000,000 -29,000,000 -4,000,000 -27,000,000 -48,000,000 -235,000,000 -5,000,000 -57,000,000 -39,000,000 -36,000,000 -3,000,000 -76,000,000 -19,000,000 -19,000,000 -21,000,000 -150,000,000 -5,000,000 -58,000,000 -22,000,000 -17,000,000 -4,000,000 -369,000,000 -8,000,000                                         
          proceeds from secured seller promissory note from the sale of the homeowner services group
        795,000,000                                                                         
          removal costs from property, plant and equipment retirements
        -40,000,000 -55,000,000 -49,000,000 -42,000,000 -29,000,000 -40,000,000 -39,000,000 -35,000,000 -38,000,000 -46,000,000 -35,000,000 -47,000,000 -31,000,000 -38,000,000 -36,000,000 -29,000,000 -20,000,000 -39,000,000 -27,000,000 -25,000,000 -18,000,000 -31,000,000 -25,000,000 -27,000,000 -23,000,000 -33,000,000 -30,000,000 -23,000,000 -18,000,000 -26,000,000 -21,000,000 -20,000,000 -20,000,000 -25,000,000 -23,000,000 -15,000,000 -13,000,000 -22,000,000 -18,000,000 -27,000,000 -17,000,000 -33,253,000 -27,818,000 -31,664,000 -14,265,000 -26,216,000 -20,593,000 -20,906,000 -10,460,000 -15,088,000 -19,213,000 -19,705,000 -10,721,000 -18,495,000 -13,972,000 -13,707,000 -10,927,000 -14,219,000 -14,877,000 -15,441,000 -8,597,000 -15,425,000 -11,174,000 -11,186,000 -5,910,000 -9,733,000 -7,245,000 -7,891,000 -5,031,000 -7,503,000 -12,433,000 -3,143,000 -1,714,000 
          purchases of available-for-sale fixed-income securities
         -3,000,000 -8,000,000 -8,000,000 -27,000,000 -22,000,000                                                                    
          proceeds from sales and maturities of available-for-sale fixed-income securities
        17,000,000 25,000,000 24,000,000 21,000,000 39,000,000 34,000,000                                                                    
          net cash from investing activities
        93,000,000 -1,130,000,000 -839,000,000 -772,000,000 -568,000,000 -1,220,000,000 -688,000,000 -738,000,000 -733,000,000 -887,000,000 -664,000,000   -765,000,000 -686,000,000 -835,000,000 159,000,000 -183,000,000 -519,000,000 -471,000,000 -363,000,000 -615,000,000 -488,000,000 -508,000,000 -450,000,000 -691,000,000 -437,000,000 -466,000,000 -351,000,000 -491,000,000 -396,000,000 -763,000,000 -386,000,000 -651,000,000 -381,000,000 -352,000,000 -288,000,000 -573,000,000 -349,000,000 -342,000,000 -323,000,000 -421,018,000 -476,807,000 -320,659,000 -246,516,000 -292,648,000 -283,167,000 -232,974,000 -205,200,000 -333,927,000 -259,980,000 -231,677,000 -227,710,000 -197,000,000 -215,025,000 -199,936,000 229,605,000 -306,396,000 -230,576,000 -209,237,000 -166,188,000 -240,791,000 -174,726,000 -193,444,000 -137,782,000 -177,400,000 -169,106,000 -154,824,000 -202,281,000 -310,093,000 -295,960,000 -239,909,000 -187,705,000 
          cash flows from financing activities
                                                                                 
          proceeds from long-term debt, net of discount
        7,000,000 5,000,000 900,000,000 66,000,000 810,000,000 21,000,000 13,000,000 12,000,000 1,391,000,000                                                                 
          repayments of long-term debt
        -3,000,000 -41,000,000 -17,000,000 -75,000,000 -531,000,000 -1,000,000 -8,000,000 -17,000,000 -449,000,000 -19,000,000 -93,000,000 -166,000,000 -4,000,000 -1,000,000 -7,000,000 -2,000,000 -5,000,000 -2,000,000 -6,000,000 -339,000,000 -25,000,000 -76,000,000 -100,000,000 -160,000,000 -6,000,000 -342,000,000 -7,000,000 -134,000,000 -12,000,000 -196,000,000 -211,000,000 -113,000,000 -6,000,000 -562,000,000 -328,000,000 -2,000,000 -4,000,000 -124,000,000 -7,000,000 -2,000,000 -11,000,000                                 
          net short-term (repayments) borrowings with original maturities less than three months
        -222,000,000                                                                         
          advances and contributions in aid of construction, net of refunds of 8 and 9 for the three months ended march 31, 2026 and 2025, respectively
        19,000,000                                                                         
          debt issuance costs
         -10,000,000 -2,000,000 -5,000,000 -1,000,000 1,000,000 -14,000,000                          -4,000,000 -1,000,000 263,000 -5,257,000      -3,377,000        -552,000 -1,530,000 -3,332,000 -1,488,000 -269,000 -6,452,000 -1,819,000 -1,957,000 -2,937,000 -2,971,000 277,000   
          dividends paid
        -162,000,000 -161,000,000 -161,000,000 -162,000,000 -149,000,000 -149,000,000 -149,000,000 -149,000,000 -138,000,000 -137,000,000 -138,000,000 -138,000,000 -119,000,000 -119,000,000 -120,000,000 -119,000,000 -109,000,000 -110,000,000 -109,000,000 -109,000,000 -100,000,000 -99,000,000 -100,000,000 -100,000,000 -90,000,000 -90,000,000 -90,000,000 -91,000,000 -82,000,000 -82,000,000 -82,000,000 -81,000,000 -74,000,000 -74,000,000 -74,000,000 -74,000,000 -67,000,000 -67,000,000 -67,000,000 -66,000,000 -61,000,000 -61,336,000 -61,015,000 -61,034,000 -55,615,000 -55,506,000 -55,458,000 -55,422,000 -49,968,000 -49,896,000 -49,810,000   -88,436,000 -44,080,000 -40,529,000 -40,414,000 -40,392,000 -40,358,000 -38,580,000 -38,525,000 -38,476,000 -38,457,000 -36,689,000 -36,679,000 -36,667,000 -36,658,000 -31,934,000 -32,072,000 -32,063,000    
          other
        -5,000,000 4,000,000 -4,000,000 10,000,000 -4,000,000 3,000,000 3,000,000 3,000,000 -1,000,000 3,000,000 3,000,000 3,000,000 -7,000,000 3,000,000 4,000,000                              -13,844,000 -17,498,000 -19,980,000 10,127,000 9,624,000 11,373,000 -2,247,000 -1,693,000 -8,160,000 32,811,000 12,182,000 -15,541,000 -3,381,000 37,220,000 6,511,000 12,854,000 -12,064,000 -4,913,000 3,144,000 -10,736,000 -8,009,000 -6,129,000 -6,530,000 -34,729,000 23,234,000 100,842,000 12,642,000 -27,808,000 -31,033,000 
          net cash from financing activities
        -366,000,000 397,000,000 149,000,000 449,000,000 254,000,000 544,000,000 88,000,000 -135,000,000 613,000,000 63,000,000 -132,000,000 856,000,000 401,000,000 434,000,000 125,000,000 794,000,000 -353,000,000 -193,000,000 6,000,000 135,000,000 -293,000,000 154,000,000 25,000,000 173,000,000 768,000,000 228,000,000 1,000,000 155,000,000 110,000,000 140,000,000 -52,000,000 472,000,000 166,000,000 154,000,000 -52,000,000 91,000,000 14,000,000 251,000,000 -64,000,000 57,000,000 97,000,000 67,492,000 -30,344,000 221,741,000 49,111,000 -15,425,000 -64,485,000   120,951,000 -126,411,000 90,290,000 74,833,000 -17,682,000 -197,506,000 34,581,000 -382,409,000 72,669,000 -80,917,000 108,305,000 5,078,000 42,496,000 -111,901,000 79,902,000 -47,831,000 67,220,000 -74,918,000 69,111,000 58,756,000 153,690,000 45,097,000 180,737,000 98,035,000 
          net increase in cash, cash equivalents and restricted funds
        32,000,000 -70,000,000   17,000,000 -37,000,000 79,000,000 -528,000,000 262,000,000 -297,000,000 -163,000,000 582,000,000 125,000,000     36,000,000 -4,000,000 5,000,000 -477,000,000 -23,000,000 -6,000,000 16,000,000 498,000,000  29,000,000                                               
          cash, cash equivalents and restricted funds at beginning of period
        139,000,000 140,000,000 364,000,000 117,000,000 136,000,000 576,000,000 91,000,000  159,000,000                                             
          cash, cash equivalents and restricted funds at end of period
        171,000,000 -70,000,000 74,000,000 -22,000,000 157,000,000 -37,000,000 79,000,000 -528,000,000 626,000,000 -297,000,000 -163,000,000 582,000,000 242,000,000 13,000,000 7,000,000 1,000,000 96,000,000 36,000,000 -4,000,000 5,000,000 99,000,000 -23,000,000 -6,000,000 16,000,000 589,000,000  29,000,000 1,000,000 86,000,000                                             
          non-cash investing activity:
                                                                                 
          capital expenditures acquired on account but unpaid as of the end of period
        320,000,000  32,000,000 1,000,000 298,000,000  -58,000,000 -47,000,000 422,000,000  5,000,000 5,000,000 338,000,000  12,000,000 20,000,000 315,000,000  12,000,000 3,000,000 223,000,000  -14,000,000 -6,000,000 256,000,000  51,000,000 10,000,000 184,000,000                                             
          pension and non-pension postretirement benefit contributions
                 -15,000,000 -14,000,000 -10,000,000 -10,000,000 -11,000,000 -9,000,000 -12,000,000 -19,000,000                 -12,000,000 -13,000,000 -12,000,000 -11,000,000 -11,000,000 -14,000,000 -14,000,000 -14,000,000 -17,005,000 -14,531,000 -12,732,000 -12,732,000 -16,412,000 -14,350,000 -10,719,000 -10,714,000 -19,836,000                        
          net proceeds from common stock financing
                 1,688,000,000                                                             
          net short-term borrowings (repayments) with maturities less than three months
             665,000,000       -1,175,000,000 541,000,000                                135,980,000                            
          advances and contributions in aid of construction, net of refunds of 31, 33 and 25 in 2025, 2024 and 2023, respectively
                                                                                 
          cash paid during the year for:
                                                                                 
          interest, net of capitalized amount
                                                                                 
          capital expenditures acquired on account but unpaid as of year end
                                                                                 
          acquisition financed by treasury stock
         4,000,000                                                                     
          non-cash financing activity:
                                                                                 
          settlements of long-term debt
                                                                               
          net short-term borrowings with original maturities less than three months
                                                                                 
          advances and contributions in aid of construction, net of refunds of 25 and 24 for the nine months ended september 30, 2025 and 2024, respectively
                                                                                 
          net short-term borrowings (repayments) with original maturities less than three months
           590,000,000 120,000,000                                                                     
          advances and contributions in aid of construction, net of refunds of 16 and 16 for the six months ended june 30, 2025 and 2024, respectively
                                                                                 
          net decrease in cash, cash equivalents and restricted funds
                      7,000,000 1,000,000 -40,000,000            -73,000,000                                             
          advances and contributions in aid of construction, net of refunds of 9 for the three months ended march 31, 2025 and 2024
            13,000,000                                                                     
          gain on sale of businesses
                                                                                 
          proceeds from sale of assets, net of cash on hand
                                                                                 
          advances and contributions in aid of construction, net of refunds of 33, 25 and 19 in 2024, 2023 and 2022, respectively
                                                                                 
          income taxes, net of refunds of 5, 30 and 2 in 2024, 2023 and 2022, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 24 and 21 for the nine months ended september 30, 2024 and 2023, respectively
                                                                                 
          net short-term repayments with maturities less than three months
               -179,000,000                                                                
          advances and contributions in aid of construction, net of refunds of 16 and 16 for the six months ended june 30, 2024 and 2023, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 9 and 7 for the three months ended march 31, 2024 and 2023, respectively
                3,000,000                                                                 
          proceeds from long-term debt
                 18,000,000 86,000,000 1,152,000,000 8,000,000 11,000,000 800,000,000 11,000,000 5,000,000 11,000,000 1,100,000,000 2,000,000 84,000,000 87,000,000 1,155,000,000 8,000,000 339,000,000 7,000,000 1,182,000,000 2,000,000 3,000,000 1,340,000,000 5,000,000 10,000,000 13,000,000 1,362,000,000   551,000,000   1,273,000 555,979,000      401,420,000 1,359,000 1,378,000 300,700,000 358,000 14,372,000 160,000 75,000 11,977,000 298,000 106,018,000 161,348,000 92,000 1,101,000 205,932,000 27,209,000 234,785,000 75,000,000 78,112,000 283,000   
          (repayments of) proceeds from term loan
                         -500,000,000                                                     
          net short-term (repayments) borrowings with maturities less than three months
                       99,000,000 -263,000,000                                                         
          advances and contributions in aid of construction, net of refunds of 25, 19 and 25 in 2023, 2022 and 2021, respectively
                                                                                 
          debt issuance costs and make-whole premium on early debt redemption
                 -1,000,000 -2,000,000                                                           
          income taxes, net of refunds of 30, 2 and 6 in 2023, 2022 and 2021, respectively
                                                                                 
          seller promissory note from the sale of the homeowner services group
                                                                                 
          contingent cash payment from the sale of the homeowner services group
                                                                                 
          net proceeds from sale of assets
                      608,000,000                                                         
          advances and contributions in aid of construction, net of refunds of 21 and 13 for the nine months ended september 30, 2023 and 2022, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 16 and 8 for the six months ended june 30, 2023 and 2022, respectively
                                                                                 
          net cash from in investing activities
                    -561,000,000                                                             
          advances and contributions in aid of construction, net of refunds of 7 and 3 for the three months ended march 31, 2023 and 2022, respectively
                    10,000,000                                                             
          (gain) or loss on sale of businesses
                                                                                 
          advances and contributions in aid of construction, net of refunds of 19, 25 and 24 in 2022, 2021 and 2020, respectively
                                                                                 
          income taxes, net of refunds of 2, 6 and 2 in 2022, 2021 and 2020, respectively
                                                                                 
          repayments of term loan
                                                                                 
          advances and contributions in aid of construction, net of refunds of 13 and 17 for the nine months ended september 30, 2022 and 2021, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 8 and 12 for the six months ended june 30, 2022 and 2021, respectively
                                                                                 
          remittances from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 12 and 15 for the three months ended march 31, 2022 and 2021, respectively
                        -8,000,000                                                         
          advances and contributions in aid of construction, net of refunds of 3 and 6 for the three months ended march 31, 2022 and 2021, respectively
                        21,000,000                                                         
          net short-term borrowings with maturities less than three months
                         -101,000,000 79,000,000 -510,000,000 334,000,000 237,000,000 125,000,000 -506,000,000 139,000,000 313,000,000 77,000,000 -805,000,000 237,000,000 401,000,000 -1,087,000,000 468,000,000 278,000,000 801,000,000 -1,014,000,000 137,000,000 131,000,000 -101,000,000 1,000,000 110,000,000 211,000,000   216,451,000 94,572,000   99,211,000 193,920,000                         
          (remittances) proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 18, 17 and 11 in 2021, 2020 and 2019, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 25, 24 and 30 in 2021, 2020 and 2019, respectively
                                                                                 
          anti-dilutive share repurchases
                                 -36,000,000 -45,000,000                                         
          income taxes, net of refunds of 6, 2 and 4 in 2021, 2020 and 2019, respectively
                                                                                 
          pension and postretirement benefit contributions
                          -13,000,000 -9,000,000 -9,000,000  -9,000,000 -12,000,000 -10,000,000  -9,000,000 -7,000,000 -7,000,000                                             
          proceeds from sale of assets
                             2,000,000 31,000,000 1,000,000 1,000,000 15,000,000 2,000,000 26,000,000            205,000 3,566,000 1,214,000  139,000 422,000 243,000                         
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 15 and 17 for the nine months ended september 30, 2021 and 2020, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 17 and 20 for the nine months ended september 30, 2021 and 2020, respectively
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 15 and 16 for the six months ended june 30, 2021 and 2020, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 12 and 15 for the six months ended june 30, 2021 and 2020, respectively
                                                                                 
          net proceeds from revolving credit facility borrowings
                                215,000,000                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 15 and 11 for the three months ended march 31, 2021 and 2020, respectively
                            -11,000,000                                                     
          advances and contributions for construction, net of refunds of 6 and 8 for the three months ended march 31, 2021 and 2020, respectively
                            7,000,000                                                     
          loss on asset dispositions and purchases
                                                            -94,000   -213,000 -413,000 346,000                
          impairment charge
                                                                        450,000,000 750,000,000 
          impact of freedom industries settlement activities
                                                                               
          proceeds from term loan
                             500,000,000                                                 
          issuance of common stock
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 17, 11 and 8 in 2020, 2019 and 2018, respectively
                                                                                 
          advances and contributions in aid of construction, net of refunds of 24, 30 and 22 in 2020, 2019 and 2018, respectively
                                                                                 
          income taxes, net of refunds of 2, 4 and 0 in 2020, 2019 and 2018, respectively
                                                                                 
          (gain) on asset dispositions and purchases
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 17 and 11 for the nine months ended september 30, 2020 and 2019, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 20 and 25 for the nine months ended september 30, 2020 and 2019, respectively
                                                                                 
          gain on asset dispositions and purchases
                                  -6,000,000 -3,000,000 -18,000,000 -2,000,000 -7,000,000 -7,000,000   -2,000,000 -5,000,000 -2,000,000 -1,000,000  -175,000 -1,209,000 -1,128,000   -345,000 -270,000                         
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 16 and 9 for the six months ended june 30, 2020 and 2019, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 15 and 17 for the six months ended june 30, 2020 and 2019, respectively
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 11 and 6 for the three months ended march 31, 2020 and 2019, respectively
                                -5,000,000                                                 
          advances and contributions for construction, net of refunds of 8 and 9 for the three months ended march 31, 2020 and 2019, respectively
                                7,000,000                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 11, 8 and 11 in 2019, 2018 and 2017, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 30, 22 and 22 in 2019, 2018 and 2017, respectively
                                                                                 
          net increase in cash and cash equivalents and restricted funds
                                     43,000,000 19,000,000 15,000,000 -1,000,000                                         
          cash and cash equivalents and restricted funds at beginning of period
                                     83,000,000                                         
          cash and cash equivalents and restricted funds at end of period
                                     43,000,000 19,000,000 15,000,000 82,000,000                                         
          income taxes, net of refunds of 4, 0 and 0 in 2019, 2018 and 2017, respectively
                                                                                 
          proceeds from issuance of common stock
                                                                              
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 11 and 7 for the nine months ended september 30, 2019 and 2018, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 25 and 20 for the nine months ended september 30, 2019 and 2018, respectively
                                                                                 
          make-whole premium on early debt redemption
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 9 and 6 for the six months ended june 30, 2019 and 2018, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 17 and 16 for the six months ended june 30, 2019 and 2018, respectively
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 6 and 5 for the three months ended march 31, 2019 and 2018, respectively
                                    -1,000,000                                             
          advances and contributions for construction, net of refunds of 9 and 4 for the three months ended march 31, 2019 and 2018, respectively
                                    2,000,000                                             
          proceeds from issuances of employee stock plans and direct stock purchase plan, net of taxes paid of 8, 11 and 13 in 2018, 2017 and 2016, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 22, 22 and 31 in 2018, 2017 and 2016, respectively
                                                                                 
          income taxes, net of refunds of 0 in 2018, 2017 and 2016
                                                                                 
          proceeds from issuances of employee stock plans and direct stock purchase plan
                                      3,000,000 8,000,000 4,000,000                                         
          advances and contributions for construction, net of refunds of 20 and 16 for the nine months ended september 30, 2018 and 2017, respectively
                                                                                 
          taxes paid related to employee stock plans
                                      -1,000,000 -1,000,000 -5,000,000 -1,000,000 -1,000,000 -9,000,000                                     
          capital expenditures acquired on account but unpaid as of end of period
                                      7,000,000 5,000,000 175,000,000  30,000,000 3,000,000 142,000,000  15,000,000 1,000,000 166,000,000                                 
          pension and non-pension post-retirement benefits
                                       8,000,000 8,000,000                                         
          pension and non-pension post-retirement benefit contributions
                                                                                 
          advances and contributions for construction, net of refunds of 16 and 11 for the six months ended june 30, 2018 and 2017, respectively
                                                                                 
          proceeds from sale of assets and securities
                                        6,000,000 6,000,000 5,000,000   4,000,000 3,000,000 1,000,000 1,000,000         169,000 169,000 300,000 280,000 1,644,000 85,000 98,635,000 461,375,000 2,928,000 387,000 6,499,000 158,000 89,000 51,000 12,000 87,000 110,000 906,000 17,000 204,000 445,000 11,361,000 716,000 82,000 
          advances and contributions for construction, net of refunds of 4 for the three months ended march 31, 2018 and 2017, respectively
                                        4,000,000                                         
          proceeds from short-term borrowings with maturities greater than three months
                                                   35,000,000 201,000,000                        
          repayments of short-term borrowings with maturities greater than three months
                                                                                 
          advances and contributions for construction, net of refunds of 22, 31 and 23 in 2017, 2016 and 2015, respectively
                                                                                 
          income taxes, net of refunds of 0, 0 and 1 in 2017, 2016 and 2015, respectively
                                                                                 
          acquisitions
                                          -1,000,000 -7,000,000 -2,000,000  -5,000,000 -2,000,000 -22,000,000    -48,000 -2,882,000 -3,184,000 -590,000 -2,279,000 -7,104,000 -11,952,000 -1,766,000 -2,836,000 -227,000 -40,000 -44,189,000 -104,000 -839,000 -1,612,000 -3,324,000 -1,445,000 28,000 -98,000 -1,044,000 -528,000 -17,494,000    -4,491,000 -7,773,000   
          net funds restricted
                                          -2,000,000 -3,000,000   -1,000,000 -1,000,000                                 
          proceeds from issuances of employee stock plans and drip
                                          5,000,000 6,000,000 10,000,000 4,000,000 4,000,000 8,000,000 10,000,000    6,191,000 5,467,000 3,277,000 3,970,000 8,199,000 6,563,000 5,008,000 6,639,000 8,141,000 5,798,000 9,468,000 2,960,000 9,634,000                 
          advances and contributions for construction, net of refunds of 16 and 17, respectively
                                                                                 
          anti-dilutive stock repurchase
                                          -54,000,000                                    
          net increase in cash and cash equivalents
                                          29,000,000 -14,000,000 3,000,000 29,000,000 -6,000,000 -14,000,000 21,000,000 -30,144,000 -69,528,000 120,458,000 1,214,000 -51,048,000 41,995,000 1,378,000 3,791,000 -5,490,000 12,088,000 -815,000 -3,252,000 5,902,000 5,612,000 3,417,000 -4,705,000 -1,414,000 2,155,000 -62,000 416,000 -10,389,000         775,000 -3,288,000 -4,279,000 
          cash and cash equivalents as of beginning of period
                                          75,000,000  45,000,000                                 
          cash and cash equivalents as of end of period
                                          29,000,000 -14,000,000 78,000,000  -6,000,000 -14,000,000 66,000,000                                 
          advances and contributions for construction, net of refunds of 11 and 12, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 4 and 4, respectively
                                            7,000,000                                     
          other current assets and liabilities
                                                 -40,461,000 93,182,000                               
          impact of binding global agreement in principle
                                                                                 
          net funds (restricted) released
                                                          6,448,000 6,238,000 -1,347,000                     
          advances and contributions for construction, net of refunds of 31, 23 and 21 in 2016, 2015 and 2014, respectively
                                                                                 
          tax benefit realized from equity compensation
                                              1,000,000 3,000,000 4,000,000  2,838,000 889,000 2,908,000                             
          cash and cash equivalents at beginning of period
                                                 -80,000 23,080,000 26,964,000 24,433,000 14,207,000 13,112,000 22,256,000 9,542,000 13,481,000 
          cash and cash equivalents at end of period
                                                 -30,224,000 -69,528,000 120,458,000 24,294,000 -51,048,000 41,995,000 1,378,000 30,755,000 -5,490,000 12,088,000 -815,000 21,181,000 5,902,000 5,612,000 3,417,000 9,502,000 -1,414,000 2,155,000 -62,000 13,528,000 -10,389,000 2,891,000 7,977,000 12,633,000 14,425,000 -1,181,000 496,000 8,516,000 2,853,000 775,000 -3,288,000 9,202,000 
          income taxes, net of refunds of 0, 1 and 4 in 2016, 2015 and 2014, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 17 and 17, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 12 and 11, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 5 and 4, respectively
                                                7,000,000                                 
          anti-dilutive stock repurchases
                                                -62,000,000                                 
          advances and contributions for construction, net of refunds of 23, 21 and 23 in 2015, 2014 and 2013, respectively
                                                                                 
          income taxes, net of refunds of 1 and 4 in 2015 and 2014, respectively
                                                                                 
          adjustments to reconcile to net cash flows from operating activities
                                                                                 
          allowance for other funds used during construction
                                                  -3,571,000 -2,835,000 -2,360,000 -2,376,000 -2,805,000 -2,058,000 -2,201,000 -2,744,000 -2,800,000 -3,699,000 -3,396,000 -2,419,000 -3,735,000 -5,076,000 -4,362,000 -4,072,000 -3,696,000 -2,447,000 -2,916,000 -2,859,000 -2,586,000 -2,407,000 -2,151,000 -2,278,000 -2,290,000 -3,575,000 -3,343,000 -4,127,000 -4,442,000 -3,387,000 -2,541,000 
          changes in assets and liabilities
                                                                                 
          taxes accrued, including income taxes
                                                  7,555,000 -15,464,000 31,209,000 -22,674,000 9,600,000 -16,550,000 21,729,000 -40,116,000 8,709,000 -13,629,000 14,854,000 -12,680,000 -35,083,000 85,336,000 -16,532,000 -13,015,000 1,709,000 -6,041,000 21,621,000 33,861,000 -2,584,000 -12,527,000 20,827,000 -26,973,000 2,516,000 11,301,000 -165,000 916,000 10,372,000   
          accounts payable and accrued expenses
                                                  30,984,000                               
          acquisitions and related costs
                                                  -134,323,000                               
          net funds released
                                                    -7,006,000 14,661,000   -238,000        12,627,000    20,107,000             
          repayment of long-term debt
                                                  -82,707,000 -2,603,000 -3,091,000 -101,632,000 -133,374,000 -1,173,000 -2,192,000 -479,946,000 -7,440,000 -3,317,000 -2,392,000 -210,645,000 -103,121,000 -151,959,000 -6,229,000 -1,356,000 -4,481,000 -1,571,000 -62,637,000 -76,251,000 -153,772,000 -4,676,000 -38,001,000 -2,099,000 -23,784,000 -1,797,000 -150,451,000 -41,845,000 -8,136,000 -155,604,000 -35,915,000 
          repayment of short-term borrowings with maturities greater than three months
                                                      -35,000,000 -221,000,000                         
          proceeds from issuances of employee stock plans and dividend reinvestment plan
                                                  19,521,000                               
          advances and contributions for construction, net of refunds of 17,057 and 16,305 at september 30, 2015 and 2014, respectively
                                                                                 
          anti-dilutive share repurchase
                                                  -26,031,000                               
          capital expenditures acquired on account but unpaid at end of period
                                                  3,890,000 57,722,000 133,799,000  47,926,000 5,663,000 109,464,000                         
          advances and contributions for construction, net of refunds of 11,430 and 10,459 at june 30, 2015 and 2014, respectively
                                                                                 
          advances and contributions
                                                   5,407,000 3,006,000 7,359,000 2,816,000 2,534,000 3,526,000 8,211,000 2,698,000 3,925,000 2,756,000 3,094,000 2,997,000 5,006,000 1,182,000 7,148,000 6,329,000 4,205,000 5,822,000 6,092,000 5,073,000 8,847,000 7,554,000 12,711,000 25,036,000 27,269,000 12,078,000 42,135,000 28,328,000 1,295,000 11,283,000 
          long-term debt issued
                                                                               
          long-term debt retired
                                                     2,236,000 -340,000                           
          adjustments
                                                                                 
          provision for deferred income taxes
                                                    34,368,000  104,134,000 64,072,000 44,919,000  103,310,000 62,484,000 29,446,000 3,439,000 139,168,000 -18,423,000 76,256,000 50,840,000 75,328,000 28,669,000 40,657,000 -17,488,000 85,294,000 43,274,000 46,522,000 36,448,000 57,177,000 15,569,000 31,627,000 18,901,000 54,782,000 16,486,000 5,474,000 
          amortization of deferred investment tax credits
                                                    -338,000 -348,000 -349,000 -348,000 -349,000 -375,000 -375,000 -375,000 -376,000 -379,000 -380,000 -379,000 -380,000 -386,000 -385,000 -385,000 -386,000 -392,000 -392,000 -391,000 -392,000 -229,000 -401,000 -402,000 -401,000 -125,000 -405,000 -404,000 -404,000 
          stock-based compensation expense
                                                    2,418,000 3,373,000 2,788,000 4,171,000 2,711,000 3,558,000 2,454,000 4,420,000 2,042,000                     
          taxes receivable, including income taxes
                                                    -5,439,000 7,033,000 -3,318,000 3,810,000 -4,322,000 9,329,000 -5,285,000 3,315,000 -3,543,000    4,370,000                 
          other current assets
                                                    -3,171,000 13,434,000 -1,323,000 -4,315,000 -9,654,000 14,082,000 -8,762,000 7,412,000 -12,060,000 17,257,000 -23,145,000 10,600,000 -9,935,000 17,772,000 2,875,000 -17,465,000 -18,099,000 7,708,000 2,356,000 6,137,000 -11,052,000 19,034,000 -3,823,000 -6,624,000 -15,324,000 13,540,000 -4,195,000 -6,976,000 -13,563,000 
          accounts payable
                                                    -30,052,000 4,004,000 25,485,000 3,514,000 -59,140,000 44,276,000 4,182,000 5,035,000 -37,278,000 36,549,000 -3,869,000 2,432,000 -45,684,000 52,209,000 343,000 11,516,000 -26,244,000 13,035,000 -4,654,000 16,374,000 -18,268,000 9,175,000 -3,351,000 6,721,000 -12,493,000 -3,386,000 10,360,000 9,599,000 -13,595,000 
          interest accrued
                                                    38,411,000 -40,539,000 41,517,000 -38,110,000 41,568,000 -49,204,000 46,760,000 -46,570,000 47,291,000 -52,264,000 48,668,000 -45,869,000 43,818,000 -44,043,000 43,932,000 -44,064,000 42,758,000 -42,245,000 43,122,000 -43,938,000 43,807,000 -37,952,000 41,928,000 -34,753,000 37,276,000 -37,614,000 37,551,000 -31,528,000 34,381,000 
          change in book overdraft
                                                    -19,368,000 33,729,000 -38,573,000 14,432,000 22,089,000 -24,127,000 4,877,000 9,090,000 -21,960,000 -2,034,000 14,691,000                   
          other current liabilities
                                                    -20,919,000 22,438,000 37,306,000 4,497,000 -2,222,000 -16,184,000 27,528,000 -89,000 -26,001,000 -35,352,000 50,958,000 20,620,000 -22,134,000 -9,595,000 9,847,000 14,751,000 -10,456,000 -4,400,000 9,863,000 3,529,000 -76,000 1,369,000 2,915,000 5,354,000 -19,601,000 -13,443,000 1,972,000 15,934,000 -9,383,000 
          advances and contributions for construction, net of refunds of 4,146 and 5,277 at march 31, 2015 and 2014, respectively
                                                    5,346,000                             
          redemption of preferred stock
                                                    -1,200,000 -450,000        -2,827,000    -134,000    -134,000    -134,000    -137,000   
          benefit from deferred income taxes
                                                                                 
          benefit from losses on accounts receivable
                                                                                 
          (gain) loss on asset dispositions and purchases
                                                                                 
          advances and contributions for construction, net of refunds of 21,470 in 2014, 23,351 in 2013 and 17,850 in 2012
                                                                                 
          change in bank overdraft position
                                                             -14,242,000 -20,570,000  -5,700,000 15,117,000 -40,528,000             
          income taxes, net of refunds of 3,668 in 2014, 127 in 2013 and 766 in 2012
                                                                                 
          dividends accrued
                                                     58,000    72,000     108,000    16,000               
          operating cash flows from continuing operations
                                                                                 
          operating cash flows from discontinued operations
                                                                                 
          investing cash flows from continuing operations
                                                                                 
          investing cash flows from discontinued operations
                                                                                 
          advances and contributions for construction, net of refunds of 16,305 and 16,671 at september 30, 2014 and 2013, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 10,459 and 9,136 at june 30, 2014 and 2013, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 5,277 and
                                                                                 
          4,477 at march 31, 2014 and 2013, respectively
                                                        1,358,000                         
          redemption of preferred stocks
                                                        -1,200,000 -450,000 -1,720,000 -1,200,000    -1,100,000        -10,000         
          net cash (used in ) provided by financing activities
                                                        -35,883,000                         
          advances and contributions for construction, net of refunds of 23,351 in 2013, 17,850 in 2012 and 21,061 in 2011
                                                                                 
          income taxes, net of refunds of 127 in 2013, 766 in 2012 and 812 in 2011
                                                                                 
          non-cash investing activity
                                                                                 
          non-cash financing activity
                                                                                 
          long-term debt
                                                                   11,775,000 60,000,000   28,500,000 26,000,000       
          net borrowings (repayments) under short-term debt agreements with maturities three months or less
                                                                                 
          advances and contributions for construction, net of refunds of 16,671 and 10,748 at september 30, 2013 and 2012, respectively
                                                                                 
          capital expenditures acquired on account but unpaid at quarter-end
                                                          24,918,000 13,434,000 81,455,000  24,432,000 18,028,000 75,755,000  26,904,000 14,267,000 66,306,000  23,707,000 16,977,000 55,699,000  -493,000 1,493,000 50,267,000  12,802,000 8,344,000 58,848,000 
          pension and non-pension post retirement benefit contributions
                                                           -29,727,000 -29,766,000 -33,374,000 -33,445,000 -22,164,000 -40,427,000 -51,909,000 -62,815,000 -23,203,000 -48,803,000 -26,518,000 -50,380,000 -22,579,000 -37,780,000 -37,019,000 -35,409,000 -27,509,000 -27,509,000     
          net borrowings (repayments) under short-term debt agreements
                                                           132,676,000 63,801,000         14,031,000 -70,430,000       134,106,000 87,805,000 -129,967,000 166,740,000 
          advances and contributions for construction, net of refunds of 9,136 and 6,491 at june 30, 2013 and 2012, respectively
                                                                                 
          receivables and unbilled utility revenues
                                                            18,775,000  -21,437,000 -86,787,000 11,246,000 38,214,000 -10,942,000 -70,775,000 26,070,000 60,214,000 -33,891,000 -73,403,000 14,036,000 34,047,000 -17,939,000 -43,188,000 8,329,000 43,951,000 -41,555,000 -45,917,000 22,819,000 
          advances and contributions for construction, net of refunds of 4,477 and 3,607 at march 31, 2013 and 2012, respectively
                                                            5,105,000                     
          pension and non-pension post retirement benefits
                                                             26,863,000 20,143,000   17,860,000 17,859,000 17,860,000 17,860,000 22,335,000 22,335,000 22,336,000 22,336,000 24,655,000 26,330,000       
          advances and contributions for construction, net of refunds of 17,850 in 2012, 21,061 in 2011 and 35,830 in 2010
                                                                                 
          income taxes, net of refunds of 766 in 2012, 812 in 2011 and 37,790 in 2010
                                                                                 
          provision for losses on utility accounts receivable
                                                              5,420,000 5,744,000 1,658,000 2,842,000 5,562,000 6,185,000 1,589,000 2,479,000 5,730,000 7,299,000 3,189,000 3,990,000 5,741,000 6,752,000 5,298,000 3,917,000 6,982,000 5,532,000 836,000 
          income taxes receivable
                                                              -1,993,000    3,309,000 2,237,000 -5,680,000  -2,321,000 28,491,000 -14,644,000         
          net restricted funds released
                                                              2,959,000    15,674,000    31,306,000 3,371,000 11,251,000  30,603,000    1,484,000 289,000 2,364,000 
          net (repayments) borrowings under short-term debt agreements
                                                              -64,113,000 228,874,000 -347,951,000         -128,630,000 -25,042,000       
          advances and contributions for construction, net of refunds of 10,748 and 15,142 at september 30, 2012 and 2011, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 6,491 and 8,550 at june 30, 2012 and 2011, respectively
                                                                                 
          advances and contributions for construction, net of refunds of 3,607 and 4,072 at march 31, 2012 and 2011, respectively
                                                                7,820,000                 
          advances and contributions for construction, net of refunds of 21,061 in 2011, 35,830 in 2010 and 27,481 in 2009
                                                                                 
          change in cash overdraft position
                                                                     33,827,000 -13,536,000 22,078,000 -25,196,000 26,846,000 -22,428,000 11,932,000 -23,858,000 17,719,000 -4,038,000 5,248,000 -19,117,000 
          income taxes, net of refunds of 812 in 2011, 37,790 in 2010 and 2,754 in 2009
                                                                                 
          net borrowings under short-term debt agreements
                                                                  -36,403,000 112,729,000 135,217,000    53,592,000    189,940,000     
          proceeds from employee stock plan issuances and drip
                                                                  1,511,000    1,958,000           
          advances and contributions for construction, net of refunds of 15,142 and 28,775 at september 30, 2011 and 2010, respectively
                                                                                 
          other financing activities
                                                                  -1,000               
          loss on sale of assets
                                                                   28,000 268,000 -62,000           -70,000 
          advances and contributions for construction, net of refunds of 8,550 and 18,177 at june 30, 2011 and 2010, respectively
                                                                                 
          proceeds from employee stock plan issuances
                                                                    6,694,000    801,000 506,000 573,000 484,000 526,000     
          advances and contributions for construction, net of refunds of 4,072 and 11,941 at march 31, 2011 and 2010
                                                                    5,111,000             
          advances and contributions for construction, net of refunds of 35,830 in 2010, 27,481 in 2009 and 57,580 in 2008
                                                                                 
          capital contributions
                                                                               
          income taxes, net of refunds of 37,790 in 2010, 2,754 in 2009 and 40,400 in 2008
                                                                                 
          capital expenditures acquired on account but unpaid as of year-end
                                                                                 
          amortization of removal costs net of salvage
                                                                      10,727,000 10,822,000 10,676,000 10,502,000 10,273,000 10,135,000 10,009,000 9,718,000 10,583,000 10,661,000 10,553,000 
          advances and contributions for construction, net of refunds of 28,775 and 20,041 at september 30, 2010 and 2009
                                                                                 
          gain on sale of assets
                                                                       -6,000 -71,000 213,000 -784,000 10,000 -202,000  457,000   
          advances and contributions for construction, net of refunds of 18,177 and 12,336 at june 30, 2010 and 2009
                                                                                 
          net decrease in cash and cash equivalents
                                                                       7,977,000 -9,623,000  -1,181,000 496,000 -1,026,000     
          advances and contributions for construction, net of refunds of 11,941 and 5,616 at march 31, 2010 and 2009
                                                                        -3,170,000         
          net loss
                                                                         36,371,000 91,636,000 51,989,000 -413,079,000     
          gain on early extinguishment of debt
                                                                                 
          proceeds from sale of discontinued operations
                                                                                 
          advances and contributions for construction, net of refunds of 27,481 in 2009, 57,580 in 2008 and 36,963 in 2007
                                                                                 
          income taxes, net of refunds of 2,754 in 2009, 40,400 in 2008 and 16,111 in 2007
                                                                                 
          capital contribution
                                                                                 
          construction expenditures
                                                                          -192,720,000 -203,996,000 -196,178,000 -294,247,000 -288,599,000 -237,523,000 -188,437,000 
          advances and contributions for construction, net of refunds of 20,041 and 48,111 at september 30, 2009 and 2008
                                                                                 
          advances and contributions for construction, net of refunds of 12,336 and 38,735 at june 30, 2009 and 2008
                                                                                 
          net restricted funds (invested) released
                                                                            -26,000     
          advances and contributions for construction, net of refunds of 5,616 and 29,995 at march 31, 2009 and 2008
                                                                            2,608,000     
          loss on sale of discontinued businesses
                                                                                 
          advances and contributions for construction, net of refunds of 57,580 in 2008, 36,963 in 2007 and 52,624 in 2006
                                                                                 
          income taxes, net of refunds of 40,400 in 2008, 16,111 in 2007 and 18,359 in 2006
                                                                                 
          advances and contributions for construction, net of refunds of 48,111 and 28,401 at september 30, 2008 and 2007
                                                                                 
          advances and contributions for construction, net of refunds of 38,735 and 17,720 at june 30, 2008 and 2007
                                                                                 
          taxes accrued, including federal income
                                                                                485,000 
          advances and contributions for construction, net of refunds
                                                                                -13,673,000