7Baggers

NRG Energy, Inc
(NYSE:NRG) 

NRG stock logo

NRG Energy, Inc., together with its subsidiaries, operates as an integrated power company in the United States. It operates through Texas, East, and West. The company is involved in the producing, selling, and delivering electricity and related products and services to 3.6 million residential, indus...

Founded: 1989
Full Time Employees: 4,577
Sector: Utilities
Industry: Utilities-Independent Power Producers

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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-09-30 2018-06-30 2017-09-30 2017-06-30 2017-03-31 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 2013-06-30 2013-03-31 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2011-03-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 
                                                                
      revenue
    10,256,000,000 7,753,000,000 7,635,000,000 6,740,000,000 8,585,000,000 6,819,000,000 7,223,000,000 6,659,000,000 7,429,000,000 6,807,000,000 7,946,000,000 6,348,000,000 7,722,000,000 5,922,000,000 8,510,000,000 7,282,000,000 7,896,000,000                                            
      yoy
    19.46% 13.70% 5.70% 1.22% 15.56% 0.18% -9.10% 4.90% -3.79% 14.94% -6.63% -12.83% -2.20%                                                
      qoq
    32.28% 1.55% 13.28% -21.49% 25.90% -5.59% 8.47% -10.36% 9.14% -14.33% 25.17% -17.79% 30.40% -30.41% 16.86% -7.78%                                             
      operating costs and expenses
                                                                
      cost of operations
    8,858,000,000 6,330,000,000 6,241,000,000 5,629,000,000 6,561,000,000 4,871,000,000 7,239,000,000 4,356,000,000 5,685,000,000 6,365,000,000 6,421,000,000 4,962,000,000 8,778,000,000 8,827,000,000 7,802,000,000 5,887,000,000 4,930,000,000 6,986,000,000 3,692,000,000 2,957,000,000 6,864,000,000 1,615,000,000 2,034,000,000 1,434,000,000 1,457,000,000 1,654,000,000 2,153,000,000 1,845,000,000 1,651,000,000 2,307,000,000 2,051,000,000 2,156,000,000 1,837,000,000 2,125,000,000 1,756,000,000 2,189,000,000 2,225,000,000 3,034,000,000 2,434,000,000 3,062,000,000 2,951,000,000 3,278,000,000 2,817,000,000 2,733,000,000  2,059,000,000 1,765,000,000 1,319,000,000  2,053,000,000 1,608,000,000 1,324,000,000 1,835,000,000 1,329,000,000 1,639,000,000 975,250,000 1,893,000,000 1,242,000,000 766,000,000  
      depreciation and amortization
    432,000,000 376,000,000 360,000,000 344,000,000 326,000,000 358,000,000 352,000,000 285,000,000 268,000,000 314,000,000 308,000,000 315,000,000 190,000,000 149,000,000 145,000,000 157,000,000 183,000,000 216,000,000 199,000,000 53,000,000 317,000,000 117,000,000 99,000,000 110,000,000 109,000,000 112,000,000 91,000,000 85,000,000 85,000,000 112,000,000 227,000,000 272,000,000 260,000,000 300,000,000 309,000,000 313,000,000 393,000,000 382,000,000 396,000,000 395,000,000 427,000,000 375,000,000 386,000,000 335,000,000  305,000,000 298,000,000 234,000,000  238,000,000 222,000,000 205,000,000 210,000,000 208,000,000 202,000,000 224,000,000 212,000,000 213,000,000 169,000,000  
      selling, general and administrative costs
    593,000,000 717,000,000 612,000,000 724,000,000 549,000,000 292,000,000 645,000,000 592,000,000 591,000,000 382,000,000 638,000,000 522,000,000 426,000,000 255,000,000 326,000,000 325,000,000 322,000,000 320,000,000 318,000,000 308,000,000 330,000,000 263,000,000 253,000,000 208,000,000                                     
      acquisition-related transaction and integration costs
    45,000,000 15,000,000 8,000,000 43,000,000 8,000,000 8,000,000 7,000,000 6,000,000 9,000,000 8,000,000 18,000,000 22,000,000 71,000,000 26,000,000 8,000,000 10,000,000 8,000,000 12,000,000 17,000,000 22,000,000 42,000,000            1,000,000  5,000,000 2,000,000 -6,000,000 3,000,000 3,000,000 10,000,000 15,000,000 17,000,000 40,000,000 12,000,000  37,000,000 32,000,000         13,000,000 6,000,000 23,000,000   
      total operating costs and expenses
    9,928,000,000 7,438,000,000 7,221,000,000 6,740,000,000 7,444,000,000 5,864,000,000 8,243,000,000 5,254,000,000 6,553,000,000 7,346,000,000 7,385,000,000 5,821,000,000 9,465,000,000 9,173,000,000 8,376,000,000 6,560,000,000 5,468,000,000 7,755,000,000 4,290,000,000 3,686,000,000 8,164,000,000 2,040,000,000 2,416,000,000 1,754,000,000 1,781,000,000 1,991,000,000 2,456,000,000 2,146,000,000 1,945,000,000 2,659,000,000 2,602,000,000 2,687,000,000 2,402,000,000 2,714,000,000 2,468,000,000 2,785,000,000 7,754,000,000 4,052,000,000 3,165,000,000 3,764,000,000 3,739,000,000 4,020,000,000 3,532,000,000 3,325,000,000  2,634,000,000 2,340,000,000 1,769,000,000  2,631,000,000 2,009,000,000 1,681,000,000 2,231,000,000 1,689,000,000 1,980,000,000 1,827,000,000 2,305,000,000 1,618,000,000 1,043,000,000  
      loss on sale of assets
        -7,000,000                                                        
      operating income
    328,000,000 297,000,000 414,000,000  1,134,000,000 954,000,000 -812,000,000 1,410,000,000 872,000,000 837,000,000 561,000,000 530,000,000 -1,544,000,000 -1,317,000,000 156,000,000 754,000,000 2,425,000,000 -479,000,000 2,319,000,000 1,557,000,000 -56,000,000 -16,000,000 393,000,000 484,000,000 244,000,000 209,000,000 540,000,000 320,000,000 221,000,000 416,000,000 334,000,000 376,000,000 343,000,000 47,000,000 87,000,000 476,000,000 171,750,000 379,000,000 232,000,000 76,000,000 453,000,000 549,000,000 89,000,000   295,000,000 -259,000,000 397,000,000  43,000,000 269,000,000 314,000,000 454,000,000 444,000,000 258,000,000 314,000,000 611,000,000 619,000,000 615,000,000  
      yoy
    -71.08% -68.87% -150.99% NaN% 30.05% 13.98% -244.74% 166.04% -156.48% -163.55% 259.62% -29.71% -163.67% 174.95% -93.27% -51.57% -4430.36% 2893.75% 490.08% 221.69% -122.95% -107.66% -27.22% 51.25% 10.41% -49.76% 61.68% -14.89% -35.57% 785.11% 283.91% -21.01% 99.71% -87.60% -62.50% 526.32% -62.09% -30.97% 160.67%   86.10% -134.36%   586.05% -196.28% 26.43%  -90.32% 4.26% 0.00% -25.70% -28.27% -58.05%      
      qoq
    10.44% -28.26% NaN% NaN% 18.87% -217.49% -157.59% 61.70% 4.18% 49.20% 5.85% -134.33% 17.24% -944.23% -79.31% -68.91% -606.26% -120.66% 48.94% -2880.36% 250.00% -104.07% -18.80% 98.36% 16.75% -61.30% 68.75% 44.80% -46.88% 24.55% -11.17% 9.62% 629.79% -45.98% -81.72% 177.15% -54.68% 63.36% 205.26% -83.22% -17.49% 516.85%    -213.90% -165.24%   -84.01% -14.33% -30.84% 2.25% 72.09% -17.83% -48.61% -1.29% 0.65%   
      operating margin %
    3.20% 3.83% 5.42% NaN% 13.21% 13.99% -11.24% 21.17% 11.74% 12.30% 7.06% 8.35% -19.99% -22.24% 1.83% 10.35% 30.71% -Infinity% Infinity% Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% NaN% NaN% Infinity% -Infinity% Infinity% NaN% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity%  
      other income
    40,000,000 42,000,000 10,000,000 4,000,000 12,000,000 6,000,000 5,000,000 3,000,000 30,000,000 4,000,000 14,000,000 13,000,000 16,000,000 23,000,000 21,000,000 12,000,000  21,000,000 8,000,000 12,000,000 22,000,000 15,000,000 11,000,000 14,000,000 27,000,000 17,000,000 17,000,000 20,000,000 12,000,000 17,000,000 -20,000,000 15,000,000 10,000,000 12,000,000 8,000,000 18,000,000   4,000,000 19,000,000   5,000,000 11,000,000   4,000,000 2,000,000  5,000,000 3,000,000 5,000,000         
      interest expense
    -285,000,000 -243,000,000 -187,000,000 -148,000,000 -163,000,000 -123,000,000 -213,000,000 -163,000,000 -152,000,000 -195,000,000 -173,000,000 -151,000,000 -148,000,000 -104,000,000 -105,000,000 -105,000,000 -103,000,000 -111,000,000 -122,000,000 -125,000,000 -127,000,000 -109,000,000 -99,000,000 -96,000,000 -98,000,000 -95,000,000 -99,000,000 -105,000,000 -114,000,000 -121,000,000 -202,000,000 -221,000,000 -247,000,000 -269,000,000 -277,000,000 -284,000,000 -273,000,000 -291,000,000 -263,000,000 -301,000,000 -310,000,000 -280,000,000 -274,000,000 -255,000,000  -206,000,000 -196,000,000 -167,000,000  -164,000,000 -167,000,000  -169,000,000 -147,000,000 -153,000,000 -159,000,000 -178,000,000 -159,000,000 -138,000,000  
      total other expense
    -245,000,000 -233,000,000 -176,000,000 -153,000,000 -149,000,000 -239,000,000 -202,000,000 -358,000,000 -177,000,000 -184,000,000 -153,000,000 -133,000,000 -127,000,000 -75,000,000 -73,000,000 -89,000,000 -118,000,000 -116,000,000 -156,000,000 -99,000,000 -111,000,000 -122,000,000 -52,000,000 -70,000,000 -100,000,000 -89,000,000 -160,000,000 -132,000,000 -123,000,000 -103,000,000 -205,000,000                              
      income before income taxes
    83,000,000 64,000,000 238,000,000 -153,000,000 985,000,000 715,000,000 -1,014,000,000 1,052,000,000 695,000,000 653,000,000 408,000,000 397,000,000 -1,671,000,000 -1,392,000,000 83,000,000 665,000,000 2,307,000,000 863,500,000 2,163,000,000 1,458,000,000 -167,000,000              -251,000,000    -26,000,000 -209,000,000    -98,000,000   -476,000,000      312,000,000 327,000,000 123,000,000      
      income tax expense
    -42,000,000 -2,000,000 86,000,000 -49,000,000 235,000,000 72,000,000 -247,000,000 314,000,000 184,000,000 171,000,000 65,000,000 89,000,000 -336,000,000 -297,000,000 16,000,000 152,000,000 571,000,000 -168,000,000 545,000,000 380,000,000 -85,000,000 35,000,000 92,000,000 101,000,000 23,000,000 -3,343,000,000 6,000,000 -1,000,000 4,000,000 7,000,000 8,000,000 6,000,000                     89,000,000 117,000,000 65,000,000 114,000,000 166,000,000  298,000,000  
      net income
    125,000,000 66,000,000 152,000,000 -104,000,000 750,000,000 643,000,000 -767,000,000 738,000,000 511,000,000 482,000,000 343,000,000 308,000,000 -1,335,000,000 -1,095,000,000 67,000,000 513,000,000 1,736,000,000 -427,000,000 1,618,000,000 1,078,000,000 -82,000,000 -173,000,000 249,000,000 313,000,000 121,000,000 3,385,000,000 372,000,000 202,000,000 482,000,000 -48,000,000 96,000,000  -642,000,000  -276,000,000    -9,000,000 -136,000,000    -67,000,000   -327,000,000 259,000,000   621,000,000  223,000,000 210,000,000  33,000,000 278,000,000 432,000,000 198  
      yoy
    -83.33% -89.74% -119.82% -114.09% 46.77% 33.40% -323.62% 139.61% -138.28% -144.02% 411.94% -39.96% -176.90% 156.44% -95.86% -52.41% -2217.07% 146.82% 549.80% 244.41% -167.77% -105.11% -33.06% 54.95% -74.90% -7152.08% 287.50%  -175.08%  -134.78%    2966.67%     102.99%    -125.87%   -152.66%      -19.78% -51.39%       
      qoq
    89.39% -56.58% -246.15% -113.87% 16.64% -183.83% -203.93% 44.42% 6.02% 40.52% 11.36% -123.07% 21.92% -1734.33% -86.94% -70.45% -506.56% -126.39% 50.09% -1414.63% -52.60% -169.48% -20.45% 158.68% -96.43% 809.95% 84.16% -58.09% -1104.17% -150.00%         -93.38%        -226.25%      6.19%   -88.13% -35.65% 218181718.18%   
      net income margin %
    1.22% 0.85% 1.99% -1.54% 8.74% 9.43% -10.62% 11.08% 6.88% 7.08% 4.32% 4.85% -17.29% -18.49% 0.79% 7.04% 21.99% -Infinity% Infinity% Infinity% -Infinity% -Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% Infinity% NaN% -Infinity% NaN% -Infinity% NaN% NaN% NaN% -Infinity% -Infinity% NaN% NaN% NaN% -Infinity% NaN% NaN% -Infinity% Infinity% NaN% NaN% Infinity% NaN% Infinity% Infinity% NaN% Infinity% Infinity% Infinity% Infinity%  
      less: cumulative dividends attributable to series a preferred stock
    17,000,000 16,000,000 17,000,000 17,000,000 17,000,000 16,000,000 17,000,000 17,000,000 17,000,000 16,000,000 17,000,000 17,000,000 4,000,000                                                
      net income available for common stockholders
    108,000,000 50,000,000 135,000,000 -121,000,000 733,000,000 627,000,000 -784,000,000 721,000,000 494,000,000 466,000,000 326,000,000 291,000,000 -1,339,000,000                                                
      income per share
                                                                
      weighted-average number of common shares outstanding — basic
    207 195 193 196 198 206 207 208 209  230 231  236    245 245 245 245 245 244 245 248 262 254 265 278 299 310 317  316  315 329 331   334 338 337  323 323  228  240 243 247 252 255 254  249 253 237  
      income per weighted-average common share — basic
    0.52 4.09 0.7 -0.62 3.7 5.14 -3.79 3.47 2.36  1.42 1.26  5.17     6.6 4.4 -0.33                                        
      weighted-average number of common shares outstanding — diluted
    208 199 195 196 203 212 207 214 214  232 232  236    245 245 245 245 246 245 246 249 264 256 267 280 299 314 322  316  315 329 332   339 343 337  323 327  229  240 244 247 253 256 257  272 275 275  
      income per weighted-average common share — diluted
    0.52 4.01    4.99        5.17     6.6 4.4 -0.33                                        
      impairment losses
         21,000,000  15,000,000      8,000,000 43,000,000 155,000,000  238,000,000  306,000,000  46,000,000 29,000,000   4,000,000  1,000,000   74,000,000 14,000,000 63,000,000  115,000,000  4,767,000,000 263,000,000   27,000,000 70,000,000                   
      gain on sale of assets
     -18,000,000    -1,000,000 208,000,000 5,000,000 -4,000,000 1,376,000,000  3,000,000 199,000,000 1,000,000 22,000,000 32,000,000 -3,000,000 230,000,000   17,000,000 -3,000,000   6,000,000 5,000,000  1,000,000 1,000,000 14,000,000 14,000,000   2,000,000          19,000,000           23,000,000      
      equity in earnings of unconsolidated affiliates
     7,000,000 1,000,000 1,000,000 2,000,000 7,000,000 6,000,000 4,000,000 3,000,000  6,000,000 5,000,000 5,000,000  11,000,000 4,000,000  -6,000,000 15,000,000 14,000,000  -20,000,000 36,000,000 12,000,000  -6,000,000 29,000,000  -21,000,000 20,000,000 18,000,000 27,000,000     7,000,000 24,000,000 8,000,000    14,000,000 7,000,000  8,000,000 3,000,000 14,000,000  16,000,000 12,000,000  16,000,000 11,000,000 14,000,000 8,000,000 6,000,000    
      loss on debt extinguishment
     -2,500,000  -10,000,000  -65,000,000  -202,000,000 -58,000,000         -20,000,000 -57,000,000   -8,000,000    -4,000,000  -47,000,000  -19,000,000 -1,000,000 -1,000,000   -80,000,000  -2,250,000 -2,000,000 -7,000,000  -1,000,000 -13,000,000 -40,000,000 -41,000,000  -21,000,000 -28,000,000   -32,000,000 -115,000,000          
      income per weighted-average common share —diluted
      0.69 -0.62 3.61  -3.79 3.37 2.31  1.41 1.25                                                 
      weighted-average number of common shares outstanding — basic and diluted
             228   230  235 237 242                316  315    333 336    324   323              
      income per weighted-average common share —basic and diluted
                -5.82  0.29 2.16 7.17                                            
      provision for credit losses
                 -92,000,000 52,000,000 26,000,000 25,000,000 -17,000,000 64,000,000 40,000,000 611,000,000                                        
      equity in (losses) of unconsolidated affiliates
                    -15,000,000                                            
      operating revenues
                                                                
      total operating revenues
                     7,046,000,000 6,609,000,000 5,243,000,000 8,091,000,000 2,027,000,000 2,809,000,000 2,238,000,000 2,019,000,000 2,195,000,000 2,996,000,000 2,465,000,000 2,165,000,000 3,061,000,000 2,922,000,000 3,049,000,000 2,701,000,000 2,759,000,000 2,638,000,000 3,229,000,000 3,020,000,000 4,431,000,000 3,397,000,000 3,826,000,000 4,192,000,000 4,569,000,000 3,621,000,000 3,486,000,000  2,929,000,000 2,081,000,000 2,166,000,000  2,674,000,000 2,278,000,000 1,995,000,000 2,685,000,000 2,133,000,000 2,215,000,000 2,141,000,000 2,916,000,000 2,237,000,000 1,658,000,000  
      impairment losses on investments
                            -18,000,000 -1,000,000 -107,000,000                                  
      equity in losses of unconsolidated affiliates
                        -6,000,000    -11,000,000           -7,000,000                         
      reorganization costs
                         750,000   3,000,000 7,000,000 1,000,000 2,000,000 13,000,000 27,000,000 23,000,000                              
      development costs
                         2,000,000 1,000,000 2,000,000 3,000,000 2,000,000 1,000,000 2,000,000 2,000,000 1,000,000 16,000,000                 9,000,000  11,000,000 12,000,000 9,000,000 14,000,000 13,000,000 9,000,000 14,000,000 12,000,000 9,000,000 13,000,000  
      income from continuing operations before income taxes
                         -138,000,000 341,000,000 414,000,000 144,000,000 120,000,000 380,000,000 188,000,000 98,000,000 313,000,000 129,000,000                         380,500,000 444,000,000  496,000,000  
      income from continuing operations
                         -173,000,000 249,000,000 313,000,000 121,000,000 3,463,000,000 374,000,000 189,000,000 94,000,000 306,000,000 121,000,000                         33,000,000 278,000,000  198,000,000  
      income from discontinued operations, net of income tax
                             -78,000,000 -2,000,000 13,000,000 388,000,000    -741,000,000                            
      less: net income attributable to redeemable noncontrolling interests
                                                                
      net income attributable to nrg energy, inc.
                         -173,000,000 249,000,000 313,000,000  3,383,000,000 372,000,000 201,000,000 482,000,000  72,000,000  -626,000,000  -271,000,000    -14,000,000 -120,000,000    -56,000,000   -328,000,000 251,000,000   621,000,000  223,000,000 211,000,000 58,000,000 33,000,000 278,000,000 433,000,000 198,000,000  
      earnings per share
                                                                
      income from continuing operations per weighted-average common share — basic
                     8.93    2.08 1.02 1.28 0.49 15.71 1.47 0.71 0.34 0.94 0.31 0.63                         1.09  0.78  
      income from discontinued operations per weighted-average common share — basic
                             1.23 -0.01 0.05 1.39  -0.08                              
      earnings per weighted-average common share — basic
                          1.02 1.28 0.49  1.46 0.76 1.73 -0.24 0.23                              
      income from continuing operations per weighted-average common share — diluted
                     8.93    2.07 1.02 1.27 0.49 15.59 1.46 0.7 0.34 0.94 0.31 0.61                         1.02  0.7  
      income from discontinued operations per weighted-average common share — diluted
                             1.22 -0.01 0.05 1.38  -0.08                              
      earnings per weighted-average common share — diluted
                          1.02 1.27 0.49  1.45 0.75 1.72 -0.24 0.23                              
      selling, general and administrative
                            209,000,000 212,000,000 210,000,000 211,000,000 194,000,000 212,000,000 211,000,000 213,000,000 223,000,000 272,000,000 265,000,000 255,000,000 334,000,000 332,000,000 291,000,000 263,000,000 290,000,000 258,000,000 268,000,000 226,000,000  213,000,000 229,000,000 207,000,000  169,000,000 167,000,000 143,000,000 172,000,000 139,000,000 130,000,000 154,000,000 182,000,000 131,000,000   
      less: net income attributable to noncontrolling interest and redeemable interests
                             2,000,000  1,000,000                                 
      earnings per share attributable to nrg energy, inc.
                                                                
      dividends per common share
                               0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.15 0.14 0.15 0.14 0.15 0.14 0.14 0.14 0.12  0.12 0.09              
      less: net loss attributable to noncontrolling interest and redeemable noncontrolling interests
                                                                
      other income - affiliate
                                   14,000,000 42,000,000                            
      loss from discontinued operations, net of income tax
                                 -354,000,000 -25,000,000                              
      less: net income attributable to noncontrolling interest and redeemable noncontrolling interests
                                 24,000,000 24,000,000 -8,000,000 -16,000,000 -40,000,000  -35,000,000    -16,000,000                     
      net income attributable to nrg energy, inc. common stockholders
                                 -72,000,000                               
      earnings per share attributable to nrg energy, inc. common stockholders
                                                                
      loss from discontinued operations per weighted-average common share — basic
                                 -1.18                               
      loss from discontinued operations per weighted-average common share — diluted
                                 -1.18                               
      reorganization
                                   18,000,000                             
      development activity expenses
                                   14,000,000 18,000,000 17,000,000 18,000,000 26,000,000 41,000,000 38,000,000 41,000,000 34,000,000 29,000,000 22,000,000 21,000,000 19,000,000  20,000,000 16,000,000              
      gain/(loss) on sale of assets
                                    2,000,000                            
      other income/
                                                                
      impairment loss on investment
                                       -146,000,000                         
      total other income
                                   -180,000,000 -240,000,000 -254,000,000 -338,000,000 -408,000,000 -246,000,000 -265,000,000 -258,000,000 -285,000,000 -285,000,000 -278,000,000 -295,000,000 -278,000,000  -219,000,000 -217,000,000 -151,000,000  -178,000,000 -278,000,000  -142,000,000 -117,000,000 -135,000,000 -80,750,000 -167,000,000 -37,000,000 -119,000,000  
      income/(loss) from continuing operations before income taxes
                                   196,000,000 103,000,000                            
      income/(loss) from continuing operations
                                   190,000,000 99,000,000                            
      (loss)/income from discontinued operations, net of income tax
                                   -27,000,000                             
      net income/
                                   163,000,000    47,000,000 -19,500,000 67,000,000   97,000,000 182,000,000    137,000,000               
      net income/(loss) attributable to nrg energy, inc.
                                   171,000,000    82,000,000 -17,000,000 66,000,000   119,000,000 168,000,000    130,000,000               
      dividends for preferred shares
                                       5,000,000 5,000,000 5,000,000 5,000,000 5,000,000 49,000,000 2,000,000 3,000,000 2,000,000  3,000,000 2,000,000 3,000,000  2,000,000 3,000,000 2,000,000 2,000,000 3,000,000 2,000,000 6,750,000 6,000,000 7,000,000 14,000,000  
      gain on redemption of preferred shares
                                                                
      net income/(loss) available for common stockholders
                                   171,000,000                             
      income/(loss) per share attributable to nrg energy, inc. common stockholders
                                                                
      (loss)/income from discontinued operations per weighted-average common share — basic
                                   -0.09                             
      income/(loss) per weighted-average common share — basic
                                   0.54                             
      (loss)/income from discontinued operations per weighted-average common share — diluted
                                   -0.08                             
      income/(loss) per weighted-average common share — diluted
                                   0.53                             
      equity in (losses)/earnings of unconsolidated affiliates
                                    -3,000,000                            
      gain/(impairment loss) on investment
                                      7,000,000                          
      income tax expense/
                                    4,000,000  25,000,000 21,000,000 1,385,000,000 47,000,000   71,000,000 89,000,000                150,000,000   
      loss available for common stockholders
                                    -626,000,000  -193,000,000    -19,000,000 -125,000,000    -58,000,000   -330,000,000              
      loss per share attributable to nrg energy, inc. common stockholders
                                                                
      income/(loss) from continuing operations per weighted-average common share — basic and diluted
                                    0.36                            
      income from discontinued operations per weighted-average common share — basic and diluted
                                    -2.34                            
      loss per weighted-average common share — basic and diluted
                                    -1.98  -0.61    -0.06 -0.37                     
      equity in earnings/(losses) of unconsolidated affiliates
                                     5,000,000 4,000,000                       5,000,000 22,000,000  
      (loss)/gain on debt extinguishment
                                     -2,000,000                           
      (loss)/income before income taxes
                                     -207,000,000         -206,000,000       -135,000,000 -9,000,000          
      income tax (benefit)/expense
                                     -4,000,000                -80,000,000 -630,000,000          
      net (loss)/income
                                     -203,000,000         -80,000,000       -55,000,000           
      net (loss)/income attributable to nrg energy, inc.
                                     -163,000,000         -97,000,000       -55,000,000           
      (loss)/income available for common stockholders
                                     -163,000,000         -100,000,000       -57,000,000  -262,000,000         
      (loss)/earnings per share attributable to nrg energy, inc. common stockholders
                                                                
      (loss)/earnings per weighted-average common share — basic
                                     -0.52         -0.3                  
      (loss)/earnings per weighted-average common share — diluted
                                     -0.52         -0.3                  
      gain on postretirement benefits curtailment
                                                                
      loss on sale of assets, net of gains
                                      -83,000,000                          
      less: net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests
                                      -5,000,000                          
      gain on redemption, net of dividends for preferred shares
                                      -78,000,000                          
      gain on sale of assets and postretirement benefits curtailment
                                       32,000,000                         
      gain on debt extinguishment
                                       11,000,000                         
      income/(loss) before income taxes
                                       68,000,000 -30,250,000 114,000,000   -8,250,000 271,000,000    76,000,000  246,000,000             
      income/(loss) available for common stockholders
                                       77,000,000 -20,750,000 61,000,000   70,000,000 166,000,000    127,000,000               
      earnings/(loss) per share attributable to nrg energy, inc. common stockholders
                                                                
      earnings/(loss) per weighted-average common share — basic
                                       0.24  0.18    0.49    0.39               
      earnings/(loss) per weighted-average common share — diluted
                                       0.24  0.18    0.48    0.39               
      gain on postretirement benefits curtailment and sale of assets
                                        7,000,000   14,000,000                     
      other income/(expense)
                                        6,750,000 4,000,000               11,000,000 19,000,000       
      less: net income/(loss) attributable to noncontrolling interest and redeemable noncontrolling interests
                                        -2,500,000 1,000,000 5,000,000                      
      income tax benefit
                                          -17,000,000 -73,000,000   -126,000,000 -31,000,000  -61,000,000 -149,000,000 -13,000,000             
      equity in (loss)/earnings of unconsolidated affiliates
                                           -3,000,000                     
      equity in earnings/(loss) of unconsolidated affiliates
                                            9,750,000 18,000,000                   
      other (expense)/income
                                            3,250,000 -3,000,000                   
      less: net income attributable to noncontrolling interest
                                            5,000,000 14,000,000 17,000,000   7,000,000 1,000,000 8,000,000      -1,000,000    -1,000,000   
      operating income/
                                               180,000,000                 
      less: net (loss)/income attributable to noncontrolling interest
                                               -11,000,000                 
      net income per weighted-average common share — basic and diluted
                                               -0.18   -1.02              
      impairment charge on investment
                                                     -3,000,000 -11,000,000          
      income available for common stockholders
                                                   248,000,000   618,000,000          
      net income per weighted-average common share — basic
                     8.93    2.08    16.94                      1.09   2.54  0.88 0.82 0.22  1.09 1.68 0.78  
      net income per weighted-average common share — diluted
                     8.93    2.07    16.81                      1.08   2.53  0.87 0.81 0.22  1.02 1.56 0.7  
      impairment charge on emission allowances
                                                     160,000,000           
      net (loss)/income per weighted-average common share — basic
                                        -19.46        -1.22     -0.24  -1.06         
      net (loss)/income per weighted-average common share — diluted
                                        -19.46        -1.22     -0.24  -1.06         
      gain on sale of equity method investment
                                                           32,000,000  128,000,000   
      income available for nrg energy, inc. common stockholders
                                                        221,000,000 208,000,000 56,000,000 220,500,000 272,000,000 426,000,000 184,000,000  
      other income/(loss)
                                                          4,000,000 -2,250,000 5,000,000    
      income from discontinued operations, net of income taxes
                                                                
      common stockholders
                                                                
      amounts attributable to nrg energy, inc.:
                                                                
      income from continuing operations, net of income taxes
                                                           227.25 278  198  
      other (loss)/income
                                                             -11,000,000 -3,000,000  
      income/(losses) from continuing operations before income taxes
                                                             582,000,000   
      income/(losses) from continuing operations
                                                             432,000,000   
      income/(losses) from continuing operations per weighted-average common share — basic
                                                             1.68   
      income/(losses) from continuing operations per weighted-average common share — diluted
                                                             1.56   
      income/(losses) from continuing operations, net of income taxes
                                                             433   
      general and administrative
                                                              95,000,000  
    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 2018-09-30 2018-06-30 2017-09-30 2017-06-30 2017-03-31 2016-06-30 2016-03-31 2015-06-30 2015-03-31 2014-09-30 2014-06-30 2014-03-31 2013-06-30 2013-03-31 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 
                                                             
        assets
                                                             
        current assets
                                                        6,208,000,000    8,492,000,000 
        cash and cash equivalents
      178,000,000 4,708,000,000 732,000,000 180,000,000 693,000,000 966,000,000 1,104,000,000 376,000,000 278,000,000 541,000,000 401,000,000 422,000,000 407,000,000 430,000,000 333,000,000 580,000,000 387,000,000 250,000,000 259,000,000 361,000,000 501,000,000 3,905,000,000 697,000,000 418,000,000 759,000,000 345,000,000 243,000,000 294,000,000 859,000,000 1,359,000,000 980,000,000 1,223,000,000 752,000,000 1,513,000,000 1,389,000,000 1,659,000,000 2,146,000,000 2,164,000,000 1,953,000,000 1,481,000,000 3,187,000,000 1,368,000,000 1,707,000,000 1,149,000,000 1,014,000,000 1,127,000,000 1,939,000,000 3,447,000,000 2,168,000,000 1,813,000,000  2,250,000,000 2,282,000,000 1,188,000,000  
        funds deposited by counterparties
      176,000,000 260,000,000 323,000,000 446,000,000 730,000,000 199,000,000 12,000,000 688,000,000 241,000,000 84,000,000 263,000,000 365,000,000 330,000,000 1,708,000,000 3,134,000,000 3,970,000,000 2,570,000,000 845,000,000 1,748,000,000 533,000,000 55,000,000 19,000,000 15,000,000 36,000,000 51,000,000 32,000,000 30,000,000 31,000,000 11,000,000 30,000,000 71,000,000 31,000,000 19,000,000 3,000,000 44,000,000 101,000,000 33,000,000 68,000,000 3,000,000 9,000,000 4,000,000 134,000,000 105,000,000 135,000,000 199,000,000 259,000,000 260,000,000 457,000,000 310,000,000 509,000,000  293,000,000 468,000,000 1,275,000,000  
        restricted cash
      57,000,000 30,000,000 30,000,000 17,000,000 15,000,000 8,000,000 10,000,000 16,000,000 15,000,000 24,000,000 11,000,000 26,000,000 32,000,000 40,000,000 46,000,000 44,000,000 39,000,000 15,000,000 14,000,000 15,000,000 18,000,000 6,000,000 6,000,000 8,000,000 8,000,000 8,000,000 4,000,000 11,000,000 15,000,000 28,000,000 286,000,000 537,000,000 469,000,000 397,000,000 413,000,000 387,000,000 433,000,000 443,000,000 339,000,000 286,000,000 209,000,000 267,000,000 221,000,000 208,000,000 217,000,000 441,000,000 145,000,000 19,000,000 13,000,000 7,000,000  26,000,000 19,000,000 17,000,000  
        accounts receivable
      3,777,000,000 4,065,000,000 3,332,000,000 3,421,000,000 3,512,000,000 3,488,000,000 3,258,000,000 3,402,000,000 3,325,000,000 3,542,000,000 3,764,000,000 3,274,000,000 3,519,000,000 4,773,000,000 4,061,000,000 3,862,000,000 3,291,000,000 3,245,000,000 3,096,000,000 2,822,000,000 3,037,000,000 904,000,000 1,126,000,000 1,015,000,000 915,000,000 1,025,000,000 1,376,000,000 1,049,000,000 898,000,000 1,297,000,000 1,371,000,000 1,274,000,000 1,162,000,000 974,000,000                      
        inventory
      665,000,000 461,000,000 452,000,000 451,000,000 373,000,000 478,000,000 540,000,000 623,000,000 581,000,000 607,000,000 630,000,000 686,000,000 722,000,000 751,000,000 772,000,000 604,000,000 354,000,000 498,000,000 445,000,000 365,000,000 316,000,000 327,000,000 330,000,000 388,000,000 372,000,000 383,000,000 364,000,000 370,000,000 391,000,000 408,000,000 485,000,000 630,000,000 713,000,000 1,140,000,000 1,124,000,000 1,161,000,000 1,153,000,000 1,109,000,000 1,051,000,000 996,000,000 781,000,000 874,000,000 904,000,000 416,000,000 392,000,000 320,000,000 386,000,000 463,000,000 535,000,000 549,000,000  533,000,000 530,000,000 488,000,000  
        derivative instruments
      3,081,000,000 2,189,000,000 1,928,000,000 2,332,000,000 3,436,000,000 2,686,000,000 2,456,000,000 3,520,000,000 3,807,000,000 3,862,000,000 3,710,000,000 4,423,000,000 4,400,000,000 7,886,000,000 9,938,000,000 11,323,000,000 9,089,000,000 4,613,000,000 8,528,000,000 3,975,000,000 1,816,000,000 560,000,000 578,000,000 791,000,000 884,000,000 860,000,000 735,000,000 850,000,000 611,000,000 683,000,000 851,000,000 475,000,000 644,000,000 682,000,000 1,470,000,000 2,113,000,000 1,805,000,000 2,029,000,000 1,397,000,000 1,701,000,000 1,573,000,000 1,853,000,000 2,805,000,000 3,670,000,000 5,150,000,000 2,588,000,000          
        cash collateral paid in support of energy risk management activities
      606,000,000 365,000,000 358,000,000 361,000,000 217,000,000 309,000,000 449,000,000 384,000,000 309,000,000 441,000,000 2,000,000 270,000,000 293,000,000 260,000,000 262,000,000 295,000,000 9,000,000 291,000,000 21,000,000 80,000,000 298,000,000  77,000,000 136,000,000 200,000,000  164,000,000 163,000,000 388,000,000 209,000,000 224,000,000  277,000,000 277,000,000 218,000,000 411,000,000 299,000,000 400,000,000 375,000,000 572,000,000 687,000,000 387,000,000 455,000,000 71,000,000 498,000,000 316,000,000 254,000,000 477,000,000 391,000,000 533,000,000  475,000,000 243,000,000 178,000,000  
        prepayments and other current assets
      1,382,000,000 1,069,000,000 969,000,000 987,000,000 899,000,000 830,000,000 782,000,000 797,000,000 712,000,000 626,000,000 601,000,000 580,000,000 505,000,000 383,000,000 417,000,000 470,000,000 409,000,000 395,000,000 461,000,000 473,000,000 511,000,000 257,000,000 258,000,000 284,000,000 290,000,000 245,000,000 271,000,000 277,000,000 285,000,000 248,000,000 328,000,000 354,000,000 400,000,000 454,000,000 406,000,000 461,000,000 516,000,000 474,000,000 475,000,000 537,000,000 599,000,000 415,000,000 724,000,000 606,000,000 272,000,000 245,000,000 298,000,000 250,000,000 243,000,000 307,000,000  215,000,000 210,000,000 258,000,000  
        total current assets
      9,922,000,000 13,147,000,000 8,124,000,000 8,195,000,000 9,875,000,000 8,964,000,000 8,611,000,000 9,806,000,000 9,268,000,000 9,727,000,000 9,468,000,000 10,121,000,000 10,208,000,000 16,231,000,000 18,963,000,000 21,148,000,000 16,837,000,000 10,841,000,000 14,572,000,000 8,624,000,000 6,552,000,000 6,028,000,000 3,087,000,000 3,076,000,000 3,479,000,000 3,088,000,000 3,187,000,000 3,045,000,000 3,458,000,000 4,285,000,000 4,753,000,000 4,760,000,000 4,469,000,000 5,440,000,000 6,364,000,000 7,346,000,000 8,010,000,000 8,122,000,000 7,872,000,000 7,757,000,000 8,383,000,000 6,943,000,000 8,031,000,000 7,255,000,000 8,458,000,000 6,338,000,000 6,039,000,000 8,496,000,000 6,369,000,000 7,142,000,000  8,211,000,000 9,332,000,000 7,665,000,000  
        property, plant and equipment
      13,533,000,000 3,632,000,000 3,396,000,000 3,192,000,000 2,223,000,000 2,021,000,000 1,818,000,000 1,790,000,000 1,768,000,000 1,763,000,000 1,779,000,000 1,706,000,000 1,835,000,000 1,692,000,000 1,598,000,000 1,598,000,000 1,643,000,000 1,688,000,000 1,976,000,000 2,016,000,000 2,328,000,000 2,547,000,000 2,573,000,000 2,533,000,000 2,573,000,000 2,593,000,000 2,615,000,000 2,610,000,000 2,650,000,000 3,599,000,000 12,774,000,000 15,332,000,000 15,302,000,000 17,942,000,000                 11,564,000,000    11,545,000,000 
        other assets
                                                             
        operating lease right-of-use assets
      153,000,000 130,000,000 139,000,000 133,000,000 140,000,000 151,000,000 172,000,000 201,000,000 179,000,000 179,000,000 206,000,000 221,000,000 247,000,000 225,000,000 236,000,000 237,000,000 256,000,000 271,000,000 293,000,000 307,000,000 312,000,000 301,000,000 345,000,000 429,000,000 446,000,000 464,000,000 482,000,000 499,000,000 517,000,000                           
        goodwill
      8,881,000,000 5,017,000,000 5,015,000,000 5,017,000,000 5,012,000,000 5,011,000,000 5,018,000,000 5,060,000,000 5,076,000,000 5,079,000,000 5,143,000,000 5,143,000,000 5,343,000,000 1,650,000,000 1,650,000,000 1,657,000,000 1,796,000,000 1,795,000,000 1,801,000,000 1,793,000,000 1,572,000,000 579,000,000 579,000,000 579,000,000 579,000,000 579,000,000 591,000,000 573,000,000 573,000,000 539,000,000 539,000,000 662,000,000 662,000,000 662,000,000 999,000,000 999,000,000 2,555,000,000 2,520,000,000 2,452,000,000 2,116,000,000 2,038,000,000 1,954,000,000 1,954,000,000 1,886,000,000 1,886,000,000 1,859,000,000 1,863,000,000 1,713,000,000 1,716,000,000 1,713,000,000  1,718,000,000 1,718,000,000 1,718,000,000  
        customer relationships
      1,255,000,000 1,203,000,000 1,294,000,000 1,379,000,000 1,469,000,000 1,538,000,000 1,648,000,000 1,946,000,000 2,064,000,000 2,164,000,000 2,299,000,000 2,446,000,000                                            
        other intangible assets
      1,207,000,000 1,106,000,000 1,137,000,000 1,130,000,000 1,381,000,000 1,370,000,000 1,439,000,000 1,467,000,000 1,662,000,000 1,763,000,000 1,907,000,000 1,897,000,000                                            
        deferred income taxes
      1,796,000,000 1,843,000,000 1,855,000,000 1,935,000,000 1,923,000,000 2,067,000,000 2,098,000,000 1,841,000,000 2,100,000,000 2,251,000,000 2,540,000,000 2,711,000,000 2,925,000,000 1,881,000,000 1,516,000,000 1,501,000,000 1,638,000,000 2,155,000,000 1,994,000,000 2,499,000,000 2,719,000,000 3,066,000,000 3,087,000,000 3,170,000,000 3,265,000,000 3,286,000,000 53,000,000 55,000,000 45,000,000 11,000,000 126,000,000 205,000,000 211,000,000 223,000,000 175,000,000 185,000,000 193,000,000 188,000,000 79,000,000 79,000,000 78,000,000 10,000,000 128,000,000 115,000,000 92,000,000 65,000,000 101,000,000 381,000,000 244,000,000 174,000,000  101,000,000 46,000,000 418,000,000  
        other non-current assets
      1,602,000,000 1,478,000,000 1,477,000,000 1,315,000,000 1,186,000,000 1,145,000,000 1,124,000,000 981,000,000 842,000,000 777,000,000 739,000,000 536,000,000 354,000,000 256,000,000 224,000,000 233,000,000 255,000,000 229,000,000 619,000,000 614,000,000 625,000,000 216,000,000 314,000,000 212,000,000 225,000,000 240,000,000 252,000,000 271,000,000 255,000,000 281,000,000 655,000,000 644,000,000 659,000,000 1,172,000,000 1,239,000,000 1,151,000,000 1,405,000,000 1,404,000,000 1,281,000,000 1,307,000,000 759,000,000 578,000,000 545,000,000 392,000,000 352,000,000 324,000,000 274,000,000 222,000,000 201,000,000 156,000,000  181,000,000 185,000,000 125,000,000  
        total other assets
      16,598,000,000 12,361,000,000 12,451,000,000 12,701,000,000 12,893,000,000 13,037,000,000 13,295,000,000 14,166,000,000 14,365,000,000 14,548,000,000 16,663,000,000 17,164,000,000 17,653,000,000 11,223,000,000 11,682,000,000 11,589,000,000 10,997,000,000 10,653,000,000 11,417,000,000 10,979,000,000 10,361,000,000 6,327,000,000 6,565,000,000 6,728,000,000 6,770,000,000 6,850,000,000 3,725,000,000 3,516,000,000 3,422,000,000 3,566,000,000 5,420,000,000 5,378,000,000 5,434,000,000 6,038,000,000 6,676,000,000 6,571,000,000 10,051,000,000 9,932,000,000 10,016,000,000 8,296,000,000 6,934,000,000 7,095,000,000 6,936,000,000 5,283,000,000 5,696,000,000 5,579,000,000 7,014,000,000 7,079,000,000 6,941,000,000 5,809,000,000  6,133,000,000 6,364,000,000 4,989,000,000  
        total assets
      40,053,000,000 29,140,000,000 23,971,000,000 24,088,000,000 24,991,000,000 24,022,000,000 23,724,000,000 25,762,000,000 25,401,000,000 26,038,000,000 27,910,000,000 28,991,000,000 29,696,000,000 29,146,000,000 32,243,000,000 34,335,000,000 29,477,000,000 23,182,000,000 27,965,000,000 21,619,000,000 19,241,000,000 14,902,000,000 12,225,000,000 12,337,000,000 12,822,000,000 12,531,000,000 9,527,000,000 9,171,000,000 9,530,000,000 11,450,000,000 22,947,000,000 25,470,000,000 25,205,000,000 29,420,000,000 31,422,000,000 32,680,000,000 40,365,000,000 40,330,000,000 40,069,000,000 37,629,000,000 34,961,000,000 34,492,000,000 35,371,000,000 27,856,000,000 28,530,000,000 24,760,000,000 25,336,000,000 27,419,000,000 25,103,000,000 24,578,000,000 23,378,000,000 25,954,000,000 27,305,000,000 24,198,000,000 24,808,000,000 
        liabilities and stockholders’ equity
                                                             
        current liabilities
                                                        3,762,000,000    6,581,000,000 
        current portion of long-term debt and finance leases
      3,375,000,000 31,000,000 777,000,000 1,132,000,000 997,000,000 996,000,000 258,000,000 262,000,000 1,101,000,000 620,000,000 920,000,000 1,319,000,000 971,000,000 63,000,000 62,000,000 62,000,000 4,000,000 4,000,000 504,000,000 79,000,000 831,000,000     88,000,000 302,000,000                             
        current portion of operating lease liabilities
      38,000,000 35,000,000 36,000,000 38,000,000 52,000,000 66,000,000 77,000,000 91,000,000 94,000,000 90,000,000 91,000,000 91,000,000 94,000,000 83,000,000 82,000,000 82,000,000 82,000,000 81,000,000 79,000,000 79,000,000 79,000,000 69,000,000 69,000,000 69,000,000 71,000,000 73,000,000 73,000,000 74,000,000 74,000,000                           
        accounts payable
      2,485,000,000 2,834,000,000 2,319,000,000 2,544,000,000 2,356,000,000 2,513,000,000 1,994,000,000 2,109,000,000 2,027,000,000 2,325,000,000 2,200,000,000 2,107,000,000 2,330,000,000 3,643,000,000 2,871,000,000 2,933,000,000 2,216,000,000 2,274,000,000 1,967,000,000 2,166,000,000 2,216,000,000 649,000,000 753,000,000 736,000,000 708,000,000 722,000,000 866,000,000 723,000,000 697,000,000 824,000,000 975,000,000 911,000,000 757,000,000 872,000,000 898,000,000 845,000,000 1,080,000,000 1,045,000,000 1,098,000,000 1,103,000,000 1,082,000,000 1,196,000,000 1,054,000,000 1,350,000,000 1,080,000,000 974,000,000 842,000,000 765,000,000 690,000,000 595,000,000  725,000,000 857,000,000 358,000,000  
        cash collateral received in support of energy risk management activities
      176,000,000 260,000,000 323,000,000 446,000,000 730,000,000 199,000,000 12,000,000 688,000,000 241,000,000 84,000,000 263,000,000 365,000,000 330,000,000 1,708,000,000 3,134,000,000 3,970,000,000 2,570,000,000 845,000,000 1,748,000,000 533,000,000 55,000,000 19,000,000 15,000,000 36,000,000 51,000,000 32,000,000 30,000,000 31,000,000 11,000,000 30,000,000 72,000,000 31,000,000 19,000,000 3,000,000 44,000,000 100,000,000 33,000,000 68,000,000 3,000,000 9,000,000 4,000,000 134,000,000 105,000,000 135,000,000 199,000,000 259,000,000 260,000,000 457,000,000 310,000,000 509,000,000  293,000,000 468,000,000 1,277,000,000  
        deferred revenue current
      727,000,000 748,000,000 710,000,000 715,000,000 690,000,000 711,000,000 761,000,000 779,000,000 710,000,000 720,000,000 731,000,000 731,000,000 688,000,000                                           
        accrued expenses and other current liabilities
      1,816,000,000 1,864,000,000 1,668,000,000 1,952,000,000 1,880,000,000 2,031,000,000 1,895,000,000 1,709,000,000 1,412,000,000 1,642,000,000 1,553,000,000 1,395,000,000 1,563,000,000 1,290,000,000 1,376,000,000 1,390,000,000 1,285,000,000 1,324,000,000 1,679,000,000 1,225,000,000 1,008,000,000 678,000,000 651,000,000 581,000,000 550,000,000 663,000,000 625,000,000 601,000,000 550,000,000 659,000,000 719,000,000 830,000,000 810,000,000 887,000,000 982,000,000 981,000,000 1,082,000,000 1,047,000,000 1,200,000,000 1,065,000,000 950,000,000 832,000,000 954,000,000 793,000,000 619,000,000 527,000,000 493,000,000 650,000,000 623,000,000 588,000,000  636,000,000 618,000,000 269,000,000  
        total current liabilities
      11,847,000,000 8,029,000,000 7,713,000,000 8,781,000,000 9,300,000,000 8,813,000,000 7,348,000,000 8,302,000,000 9,176,000,000 9,500,000,000 8,930,000,000 9,876,000,000 10,326,000,000 12,982,000,000 14,366,000,000 16,437,000,000 12,233,000,000 7,915,000,000 12,009,000,000 6,931,000,000 5,795,000,000 1,915,000,000 1,986,000,000 2,157,000,000 2,852,000,000 2,359,000,000 2,564,000,000 2,294,000,000 1,945,000,000 2,723,000,000 3,663,000,000 3,705,000,000 3,520,000,000 4,197,000,000 4,514,000,000 4,338,000,000 4,469,000,000 4,509,000,000 4,543,000,000 4,746,000,000 4,225,000,000 4,411,000,000 5,162,000,000 5,698,000,000 6,885,000,000 3,995,000,000 3,105,000,000 4,482,000,000 3,530,000,000 4,372,000,000  5,208,000,000 6,638,000,000 5,585,000,000  
        other liabilities
                                                             
        long-term debt and finance leases
      19,779,000,000 16,412,000,000 11,155,000,000 9,812,000,000 9,812,000,000 9,812,000,000 10,422,000,000 10,425,000,000 9,559,000,000 10,133,000,000 10,741,000,000 10,737,000,000 11,332,000,000 7,976,000,000 7,974,000,000 7,970,000,000 8,026,000,000 7,966,000,000 7,957,000,000 8,712,000,000      5,803,000,000 5,798,000,000                             
        non-current operating lease liabilities
      165,000,000 144,000,000 143,000,000 134,000,000 125,000,000 117,000,000 125,000,000 144,000,000 124,000,000 128,000,000 148,000,000 165,000,000 196,000,000 180,000,000 197,000,000 201,000,000 220,000,000 236,000,000 257,000,000 272,000,000 280,000,000 278,000,000 297,000,000 458,000,000 473,000,000 483,000,000 500,000,000 513,000,000 529,000,000                           
        deferred revenue non-current
      868,000,000 895,000,000 942,000,000 905,000,000 830,000,000 862,000,000 919,000,000 906,000,000 859,000,000 914,000,000 989,000,000 927,000,000 848,000,000                                           
        other non-current liabilities
      920,000,000 861,000,000 911,000,000 883,000,000 847,000,000 821,000,000 913,000,000 919,000,000 939,000,000 947,000,000 977,000,000 988,000,000 1,030,000,000 983,000,000 922,000,000 976,000,000 996,000,000 993,000,000 1,166,000,000 1,215,000,000 1,192,000,000 1,066,000,000 1,062,000,000 1,061,000,000 1,076,000,000 1,084,000,000 1,036,000,000 1,016,000,000 1,089,000,000 1,177,000,000 1,130,000,000 1,116,000,000 1,135,000,000 1,487,000,000 1,554,000,000 1,547,000,000 1,527,000,000 1,549,000,000 1,385,000,000 1,254,000,000 1,230,000,000 1,417,000,000 1,474,000,000 878,000,000 810,000,000 622,000,000 598,000,000 1,054,000,000 1,002,000,000 885,000,000  1,138,000,000 914,000,000 737,000,000  
        total other liabilities
      23,332,000,000 19,430,000,000 14,288,000,000 13,019,000,000 12,914,000,000 12,731,000,000 13,856,000,000 13,837,000,000 12,928,000,000 13,632,000,000 15,462,000,000 15,783,000,000 16,290,000,000 12,336,000,000 12,747,000,000 12,598,000,000 12,214,000,000 11,667,000,000 11,878,000,000 12,144,000,000 11,929,000,000 11,307,000,000 8,305,000,000 8,430,000,000 8,434,000,000 8,494,000,000 8,515,000,000 8,506,000,000 9,105,000,000                           
        total liabilities
      35,179,000,000 27,459,000,000 22,001,000,000 21,800,000,000 22,214,000,000 21,544,000,000 21,204,000,000 22,139,000,000 22,104,000,000 23,132,000,000 24,392,000,000 25,659,000,000 26,616,000,000 25,318,000,000 27,113,000,000 29,035,000,000 24,447,000,000 19,582,000,000 23,887,000,000 19,075,000,000 17,724,000,000 13,222,000,000 10,291,000,000 10,587,000,000 11,286,000,000 10,853,000,000 11,079,000,000 10,800,000,000 11,050,000,000 12,367,000,000 20,807,000,000 21,695,000,000 21,671,000,000 25,363,000,000 26,278,000,000 26,972,000,000 28,019,000,000 28,641,000,000 28,102,000,000 26,403,000,000 24,318,000,000 23,940,000,000 24,926,000,000 19,704,000,000 20,648,000,000 16,580,000,000 16,760,000,000 18,950,000,000 16,825,000,000 16,310,000,000  17,875,000,000 19,203,000,000 16,484,000,000  
        commitments and contingencies
                                                             
        stockholders’ equity
                                                             
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at march 31, 2026 and december 31, 2025, aggregate liquidation preference of 650 at march 31, 2026 and december 31, 2025
      650,000,000                                                       
        common stock; 0.01 par value...
      2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 3,000,000 3,000,000 3,000,000 3,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000                           
        additional paid-in-capital
      3,868,000,000  166,000,000 305,000,000 518,000,000  3,145,000,000 3,229,000,000 3,503,000,000  8,527,000,000 8,504,000,000 8,481,000,000  8,450,000,000 8,442,000,000 8,433,000,000  8,525,000,000 8,519,000,000 8,513,000,000  8,511,000,000 8,505,000,000 8,498,000,000  8,494,000,000 8,488,000,000                            
        retained earnings
      1,969,000,000 1,982,000,000 2,002,000,000 1,970,000,000 2,162,000,000 1,535,000,000 977,000,000 1,863,000,000 1,212,000,000 820,000,000 425,000,000 205,000,000  1,408,000,000 2,584,000,000 2,600,000,000 2,171,000,000                    3,346,000,000 3,413,000,000 3,564,000,000 3,445,000,000 3,594,000,000 4,179,000,000 4,124,000,000 4,026,000,000 3,777,000,000 4,099,000,000 4,156,000,000 3,817,000,000 3,596,000,000 3,388,000,000  3,305,000,000 3,033,000,000 2,607,000,000  
        treasury stock
      -1,531,000,000 -1,087,000,000 -745,000,000 -538,000,000 -440,000,000 -297,000,000 -2,150,000,000 -2,019,000,000 -1,971,000,000 -1,892,000,000 -5,911,000,000 -5,861,000,000 -5,864,000,000 -5,864,000,000 -5,754,000,000 -5,626,000,000 -5,460,000,000 -5,273,000,000 -5,230,000,000 -5,230,000,000 -5,232,000,000 -5,232,000,000 -5,234,000,000 -5,234,000,000 -5,189,000,000 -5,039,000,000                              
        accumulated other comprehensive loss
      -84,000,000 -81,000,000 -105,000,000 -101,000,000 -115,000,000 -117,000,000 -105,000,000 -103,000,000 -100,000,000 -91,000,000 -177,000,000 -170,000,000 -176,000,000 -177,000,000 -154,000,000 -120,000,000 -118,000,000 -126,000,000 -192,000,000 -182,000,000 -203,000,000 -206,000,000 -190,000,000 -194,000,000 -207,000,000 -192,000,000 -158,000,000 -99,000,000 -96,000,000 -58,000,000 -60,000,000 -91,000,000 -100,000,000 -124,000,000 -203,000,000 -195,000,000 -170,000,000 -191,000,000    -118,000,000 -136,000,000             
        total stockholders’ equity
      4,874,000,000                            -1,538,000,000 -936,000,000 2,071,000,000 3,690,000,000 3,483,000,000 4,013,000,000 5,121,000,000 5,381,000,000 12,017,000,000 11,377,000,000 11,690,000,000 10,977,000,000 10,394,000,000 10,303,000,000 10,196,000,000 7,903,000,000 7,633,000,000 7,932,000,000 8,328,000,000 8,221,000,000 8,030,000,000 8,021,000,000 7,697,000,000 7,832,000,000 7,855,000,000 7,467,000,000 7,109,000,000 
        total liabilities and stockholders’ equity
      40,053,000,000                            9,530,000,000 11,450,000,000 22,947,000,000 25,470,000,000 25,205,000,000 29,420,000,000 31,422,000,000 32,680,000,000 40,365,000,000 40,330,000,000 40,069,000,000 37,629,000,000 34,961,000,000 34,492,000,000 35,371,000,000 27,856,000,000 28,530,000,000 24,760,000,000 25,336,000,000 27,419,000,000 25,103,000,000 24,578,000,000  25,954,000,000 27,305,000,000 24,198,000,000  
        equity investments in affiliates
       16,000,000 48,000,000 47,000,000 47,000,000 45,000,000 49,000,000 45,000,000 43,000,000 42,000,000 146,000,000 139,000,000 136,000,000 133,000,000 126,000,000 127,000,000 151,000,000 157,000,000 167,000,000 164,000,000 162,000,000 346,000,000 376,000,000 372,000,000 350,000,000 388,000,000 405,000,000 383,000,000 387,000,000 452,000,000 1,055,000,000 1,138,000,000 1,127,000,000 1,148,000,000 882,000,000 898,000,000 1,077,000,000 772,000,000 797,000,000 865,000,000 462,000,000 639,000,000 677,000,000 658,000,000 643,000,000 576,000,000 549,000,000 510,000,000 394,000,000 421,000,000  392,000,000 363,000,000 494,000,000  
        liabilities and stockholders' equity
                                                             
        stockholders' equity
                                                             
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at december 31, 2025 and 2024
       650,000,000                                                      
        additional paid-in capital
       215,000,000    705,000,000    3,416,000,000    8,457,000,000    8,531,000,000    8,517,000,000    8,501,000,000   8,473,000,000 8,453,000,000 8,481,000,000 8,369,000,000 8,383,000,000 8,375,000,000 8,306,000,000 8,299,000,000 8,365,000,000 8,362,000,000 8,314,000,000 8,303,000,000 7,842,000,000 7,615,000,000 7,602,000,000 5,383,000,000 5,374,000,000 5,348,000,000 5,339,000,000 5,316,000,000 5,311,000,000 5,274,000,000  4,568,000,000 4,561,000,000 4,510,000,000  
        total stockholders' equity
       1,681,000,000 1,970,000,000 2,288,000,000 2,777,000,000 2,478,000,000 2,520,000,000 3,623,000,000 3,297,000,000 2,906,000,000 3,518,000,000 3,332,000,000 3,080,000,000 3,828,000,000 5,130,000,000 5,300,000,000 5,030,000,000 3,600,000,000 4,078,000,000 2,544,000,000 1,517,000,000 1,680,000,000 1,934,000,000 1,750,000,000 1,536,000,000 1,658,000,000 -1,571,000,000 -1,648,000,000                            
        total liabilities and stockholders' equity
       29,140,000,000 23,971,000,000 24,088,000,000 24,991,000,000 24,022,000,000 23,724,000,000 25,762,000,000 25,401,000,000 26,038,000,000 27,910,000,000 28,991,000,000 29,696,000,000 29,146,000,000 32,243,000,000 34,335,000,000 29,477,000,000 23,182,000,000 27,965,000,000 21,619,000,000 19,241,000,000 14,902,000,000 12,225,000,000 12,337,000,000 12,822,000,000 12,531,000,000 9,527,000,000 9,171,000,000                            
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at september 30, 2025 and december 31, 2024, aggregate liquidation preference of 650 at september 30, 2025 and december 31, 2024
        650,000,000                                                     
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at june 30, 2025 and december 31, 2024, aggregate liquidation preference of 650 at june 30, 2025 and december 31, 2024
         650,000,000                                                    
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at march 31, 2025 and december 31, 2024, aggregate liquidation preference of 650 at march 31, 2025 and december 31, 2024
          650,000,000                                                   
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at december 31, 2024 and 2023
           650,000,000                                                  
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at september 30, 2024 and december 31, 2023, aggregate liquidation preference of 650 at september 30, 2024 and december 31, 2023
            650,000,000                                                 
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at june 30, 2024 and december 31, 2023, aggregate liquidation preference of 650 at june 30, 2024 and december 31, 2023
             650,000,000                                                
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at march 31, 2024 and december 31, 2023, aggregate liquidation preference of 650 at march 31, 2024 and december 31, 2023
              650,000,000                                               
        nuclear decommissioning trust fund
                  879,000,000 838,000,000 789,000,000 836,000,000 949,000,000 1,008,000,000 957,000,000 957,000,000 909,000,000 890,000,000 828,000,000 794,000,000 702,000,000 794,000,000 756,000,000 748,000,000 718,000,000 719,000,000 694,000,000 670,000,000 637,000,000 627,000,000 599,000,000 577,000,000 576,000,000 586,000,000 569,000,000 576,000,000 557,000,000 503,000,000 501,000,000 448,000,000 456,000,000 399,000,000 433,000,000 389,000,000 360,000,000 382,000,000  354,000,000 316,000,000 286,000,000  
        nuclear decommissioning reserve
                  344,000,000 340,000,000 335,000,000 330,000,000 325,000,000 321,000,000 316,000,000 312,000,000 308,000,000 303,000,000 311,000,000 307,000,000 303,000,000 298,000,000 294,000,000 290,000,000 286,000,000 278,000,000 274,000,000 265,000,000 262,000,000 291,000,000 334,000,000 330,000,000 318,000,000 314,000,000 306,000,000 302,000,000 298,000,000 287,000,000 359,000,000 345,000,000 340,000,000 331,000,000 326,000,000 313,000,000 309,000,000 304,000,000  296,000,000 292,000,000 288,000,000  
        nuclear decommissioning trust liability
                  514,000,000 477,000,000 433,000,000 485,000,000 602,000,000 666,000,000 619,000,000 624,000,000 580,000,000 565,000,000 508,000,000 478,000,000 390,000,000 487,000,000 453,000,000 448,000,000 423,000,000 432,000,000 410,000,000 397,000,000 367,000,000 352,000,000 309,000,000 294,000,000 311,000,000 328,000,000 323,000,000 336,000,000 324,000,000 287,000,000 293,000,000 263,000,000 279,000,000 237,000,000 278,000,000 256,000,000 234,000,000 262,000,000  249,000,000 217,000,000 195,000,000  
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at december 31, 2023 (aggregate liquidation preference 650); 0 shares issued and outstanding at december 31, 2022
               650,000,000                                              
        current assets - held-for-sale
                86,000,000 75,000,000                                            
        non-current assets - held-for-sale
                1,153,000,000 1,161,000,000                                            
        current liabilities - held-for-sale
                44,000,000 36,000,000                                            
        non-current liabilities - held-for-sale
                926,000,000 947,000,000                                            
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at september 30, 2023 (liquidation preference 1,000); 0 shares issued and outstanding at december 31, 2022
                650,000,000                                             
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at june 30, 2023 (liquidation preference 1,000); 0 shares issued and outstanding at december 31, 2022
                 650,000,000                                            
        intangible assets
                  4,419,000,000 2,132,000,000 2,227,000,000 2,450,000,000 2,391,000,000 2,511,000,000 2,915,000,000 2,921,000,000 3,054,000,000 668,000,000 721,000,000 733,000,000 769,000,000 789,000,000 828,000,000 561,000,000 580,000,000 602,000,000 1,860,000,000 1,838,000,000 1,893,000,000 1,957,000,000                      
        preferred stock; 10,000,000 shares authorized; 650,000 series a shares issued and outstanding at march 31, 2023 (liquidation preference 1,000); 0 shares issued and outstanding at december 31, 2022
                  650,000,000                                           
        (accumulated deficit)/retained earnings
                  -15,000,000                                           
        uplift securitization proceeds receivable from ercot
                      689,000,000 689,000,000                                      
        retained earnings/
                       464,000,000 971,000,000                                     
        accumulated deficit
                         -567,000,000 -1,565,000,000 -1,403,000,000 -1,157,000,000 -1,331,000,000 -1,570,000,000 -1,616,000,000 -4,991,000,000 -5,355,000,000 -5,548,000,000 -6,001,000,000 -5,920,000,000                         
        long-term debt and finance lease
                          8,705,000,000 8,691,000,000                                  
        cash collateral posted in support of energy risk management activities
                           50,000,000    190,000,000      203,000,000                        
        current portion of long-term debt and finance lease
                           1,000,000                                  
        redeemable noncontrolling interest in subsidiaries
                               20,000,000 19,000,000 19,000,000 18,000,000 19,000,000 69,000,000 85,000,000 51,000,000 44,000,000 23,000,000 23,000,000 33,000,000 19,000,000 28,000,000                 
        current portion of long-term debt
                            3,000,000 7,000,000 640,000,000                               
        long-term debt
                            5,792,000,000 5,810,000,000 5,807,000,000                               
        current assets - discontinued operations
                                   4,000,000                          
        non-current assets - discontinued operations
                                   560,000,000                          
        current liabilities - held for sale
                                                             
        current liabilities - discontinued operations
                                   52,000,000                          
        non-current liabilities - discontinued operations
                                   547,000,000                          
        less treasury stock, at cost - 169,874,327 and 136,638,847 shares at september 30, 2019 and december 31, 2018, respectively
                                -4,920,000,000                             
        current portion of long-term debt and capital leases
                                 87,000,000 124,000,000 593,000,000 952,000,000 1,247,000,000 1,042,000,000 1,688,000,000 1,215,000,000 465,000,000 636,000,000 465,000,000 854,000,000 833,000,000 685,000,000 737,000,000 556,000,000 71,000,000 71,000,000 81,000,000 90,000,000 157,000,000 179,000,000 152,000,000  537,000,000 453,000,000 263,000,000  
        long-term debt and capital leases
                                 5,794,000,000 6,366,000,000 6,658,000,000 14,821,000,000 15,658,000,000 15,842,000,000 17,672,000,000 17,893,000,000 18,677,000,000 19,661,000,000 20,050,000,000 19,919,000,000 18,165,000,000 16,803,000,000 15,889,000,000 15,914,000,000 10,485,000,000 10,150,000,000 9,208,000,000 8,910,000,000 9,063,000,000 7,991,000,000 7,846,000,000  8,229,000,000 8,294,000,000 7,685,000,000  
        less treasury stock, at cost - 163,259,876 and 136,638,847 shares at june 30, 2019 and december 31, 2018, respectively
                                 -4,686,000,000                            
        current assets - held for sale
                                    100,000,000 33,000,000 33,000,000                       
        less treasury stock, at cost - 154,247,804 and 136,638,847 shares at march 31, 2019 and december 31, 2018, respectively
                                  -4,371,000,000                           
        accounts receivable - affiliate
                                   19,000,000 57,000,000                         
        notes receivable, less current portion
                                   10,000,000 15,000,000 5,000,000 9,000,000 13,000,000 25,000,000 40,000,000 65,000,000 67,000,000 80,000,000 85,000,000 69,000,000 70,000,000 86,000,000             
        non-current assets held-for-sale
                                    50,000,000 10,000,000 10,000,000 10,000,000 229,000,000   17,000,000 54,000,000                 
        accounts payable - affiliate
                                   14,000,000 29,000,000  17,000,000                       
        accrued expenses and other current liabilities - affiliate
                                   1,000,000 133,000,000 164,000,000 164,000,000                       
        non-current liabilities
                                                             
        out-of-market contracts
                                   177,000,000 195,000,000 213,000,000 219,000,000 1,017,000,000     1,245,000,000 1,175,000,000 1,157,000,000 1,182,000,000 1,194,000,000    201,000,000 235,000,000 258,000,000 277,000,000  324,000,000 378,000,000 271,000,000  
        total non-current liabilities
                                   9,644,000,000 17,144,000,000 17,990,000,000 18,151,000,000 21,166,000,000 21,764,000,000 22,634,000,000 23,550,000,000 24,132,000,000 23,559,000,000 21,657,000,000 20,093,000,000 19,529,000,000 19,764,000,000 14,006,000,000 13,763,000,000 12,585,000,000 13,655,000,000 14,468,000,000 13,295,000,000 11,938,000,000  12,667,000,000 12,565,000,000 10,899,000,000  
        common stock
                                   4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 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  
        less treasury stock, at cost - 129,948,876 and 101,580,045 shares, at september 30, 2018 and december 31, 2017, respectively
                                   -3,334,000,000                          
        noncontrolling interest
                                    2,437,000,000 2,507,000,000 2,462,000,000 2,388,000,000 2,599,000,000 2,656,000,000 2,638,000,000 1,848,000,000 1,752,000,000 1,160,000,000 884,000,000 567,000,000 546,000,000 430,000,000 330,000,000 162,000,000 158,000,000 17,000,000 17,000,000 12,000,000  12,000,000 12,000,000 7,000,000  
        current liabilities held-for-sale
                                    74,000,000    2,000,000    23,000,000                 
        non-current liabilities held-for-sale
                                    12,000,000 13,000,000 13,000,000 12,000,000     31,000,000                 
        less treasury stock, at cost — 116,267,484 and 101,580,045 shares, at june 30, 2018 and december 31, 2017, respectively
                                    -2,871,000,000                         
        retained deficit
                                     -4,713,000,000 -4,874,000,000 -4,238,000,000 -3,179,000,000 -2,977,000,000                    
        less treasury stock, at cost — 101,580,045 and 102,140,814 shares, respectively
                                     -2,386,000,000                        
        less treasury stock, at cost — 101,858,284 and 102,140,814 shares, respectively
                                      -2,392,000,000 -2,392,000,000                      
        current assets held-for-sale
                                        13,000,000    32,000,000                 
        accounts receivable — trade, less allowance for doubtful accounts of 20 and 21
                                        1,251,000,000                     
        renewable energy grant receivable
                                        36,000,000 35,000,000 19,000,000 68,000,000 614,000,000 614,000,000 116,000,000 345,000,000              
        property, plant and equipment, net of accumulated depreciation
                                        18,382,000,000 18,763,000,000 22,304,000,000 22,276,000,000 22,181,000,000 21,576,000,000 19,644,000,000 20,454,000,000 20,404,000,000 15,318,000,000 14,376,000,000 12,843,000,000 12,283,000,000 11,844,000,000 11,793,000,000 11,627,000,000  11,610,000,000 11,609,000,000 11,544,000,000  
        intangible assets, net of accumulated amortization of 1,650 and 1,525
                                        2,180,000,000                     
        out-of-market contracts, net of accumulated amortization of 712 and 664
                                        1,093,000,000                     
        2.822% convertible perpetual preferred stock
                                         304,000,000 296,000,000 293,000,000                  
        less treasury stock, at cost — 102,450,781 and 102,749,908 shares, respectively
                                        -2,406,000,000 -2,406,000,000                    
        accounts receivable — trade, less allowance for doubtful accounts of 19 and 21
                                         1,018,000,000                    
        intangible assets, net of accumulated amortization of 1,592 and 1,525
                                         2,256,000,000                    
        out-of-market contracts, net of accumulated amortization of 687 and 664
                                         1,122,000,000                    
        accounts receivable — trade, less allowance for doubtful accounts of 19 and 23
                                          1,413,000,000        716,000,000           
        intangible assets, net of accumulated amortization of 1,506 and 1,402
                                          2,428,000,000                   
        out-of-market contracts, net of accumulated amortization of 613 and 562
                                          1,193,000,000                   
        less treasury stock, at cost — 86,245,318 and 78,843,552 shares, respectively
                                          -2,166,000,000                   
        accounts receivable — trade, less allowance for doubtful accounts of 21 and 23
                                           1,179,000,000                  
        intangible assets, net of accumulated amortization of 1,511 and 1,402
                                           2,491,000,000                  
        out-of-market contracts, net of accumulated amortization of 585 and 562
                                           1,221,000,000                  
        less treasury stock, at cost — 81,865,411 and 78,843,552 shares, respectively
                                           -2,059,000,000                  
        accounts receivable — trade, less allowance for doubtful accounts of 27 and 40
                                            1,554,000,000                 
        intangible assets, net of accumulated amortization of 1,333 and 1,977
                                            2,880,000,000                 
        3.625% convertible perpetual preferred stock
                                            249,000,000 249,000,000 249,000,000 249,000,000 249,000,000 249,000,000 249,000,000 248,000,000 248,000,000 248,000,000 248,000,000 247,000,000  247,000,000 247,000,000 247,000,000  
        less treasury stock, at cost — 77,219,145 and 77,347,528 shares, respectively
                                            -1,939,000,000                 
        accumulated other comprehensive (loss)/income
                                            -5,000,000     -17,000,000            
        accounts receivable — trade, less allowance for doubtful accounts of 26 and 40
                                             1,482,000,000                
        intangible assets, net of accumulated amortization of 1,268 and 1,977
                                             1,434,000,000                
        less treasury stock, at cost — 77,275,933 and 77,347,528 shares, respectively
                                             -1,940,000,000 -1,940,000,000               
        accumulated other comprehensive income
                                             5,000,000 10,000,000    71,000,000 201,000,000 305,000,000 571,000,000 476,000,000 667,000,000  320,000,000 372,000,000 466,000,000  
        accounts receivable — trade, less allowance for doubtful accounts of 32 and 40
                                              1,149,000,000               
        intangible assets, net of accumulated amortization of 1,248 and 1,977
                                              1,300,000,000               
        accounts receivable — trade, less allowance for doubtful accounts of 32 and 32
                                               1,290,000,000              
        intangible assets, net of accumulated amortization of 1,851 and 1,706
                                               1,120,000,000              
        less treasury stock, at cost — 77,416,791 and 76,505,718 shares, respectively
                                               -1,944,000,000 -1,944,000,000             
        accounts receivable — trade, less allowance for doubtful accounts of 30 and 32
                                                982,000,000             
        intangible assets, net of accumulated amortization of 1,767 and 1,706
                                                1,176,000,000             
        accounts receivable — trade, less allowance for doubtful accounts of 23 and 23
                                                 1,000,000,000            
        note receivable — affiliate and capital leases, less current portion
                                                 81,000,000 370,000,000 327,000,000 419,000,000 402,000,000 434,000,000 476,000,000      
        intangible assets, net of accumulated amortization of 1,559 and 1,452
                                                 1,256,000,000            
        out-of-market commodity contracts
                                                 168,000,000 176,000,000 191,000,000          
        less treasury stock, at cost — 76,587,776 and 76,664,199 shares, respectively
                                                 -1,922,000,000 -1,922,000,000           
        intangible assets, net of accumulated amortization of 1,476 and 1,452
                                                  1,340,000,000           
        accounts receivable — trade, less allowance for doubtful accounts of 33 and 25
                                                   1,042,000,000          
        intangible assets, net of accumulated amortization of 1,345 and 1,064
                                                   1,561,000,000          
        restricted cash supporting funded letter of credit facility
                                                    1,301,000,000 1,301,000,000 1,300,000,000       
        funded letter of credit
                                                    1,300,000,000 1,300,000,000 1,300,000,000       
        less treasury stock, at cost — 65,568,119 and 56,808,672 shares, respectively
                                                   -1,881,000,000          
        accounts receivable — trade, less allowance for doubtful accounts of 18 and 25
                                                    1,008,000,000         
        derivative instruments valuation
                                                    1,749,000,000 2,479,000,000 1,800,000,000 2,724,000,000  3,199,000,000 4,394,000,000 3,862,000,000  
        intangible assets, net of accumulated amortization of 1,255 and 1,064
                                                    1,589,000,000         
        less treasury stock, at cost — 62,972,529 and 56,808,672 shares, respectively
                                                    -1,633,000,000         
        accounts receivable — trade, less allowance for doubtful accounts of 35 and 29, respectively
                                                     904,000,000        
        intangible assets, net of accumulated amortization of 948 and 648, respectively
                                                     1,541,000,000        
        preferred stock
                                                         406,000,000 406,000,000 406,000,000  
        less treasury stock, at cost — 53,767,753 and 41,866,451 shares, respectively
                                                     -1,503,000,000        
        accounts receivable — trade, less allowance for doubtful accounts of 21 and 29, respectively
                                                      909,000,000 700,000,000      
        intangible assets, net of accumulated amortization of 862 and 648, respectively
                                                      1,626,000,000       
        less treasury stock, at cost — 50,625,606 and 41,866,451 shares, respectively
                                                      -1,373,000,000       
        intangible assets, net of accumulated amortization of 758 and 648, respectively
                                                       1,686,000,000      
        less treasury stock, at cost — 48,411,606 and 41,866,451 shares, respectively
                                                       -1,323,000,000      
        statement of income data:
                                                             
        total operating revenues
                                                        8,952,000,000    6,885,000,000 
        total operating costs and expenses
                                                        7,283,000,000    5,156,000,000 
        income from continuing operations
                                                        941,000,000    1,016,000,000 
        income from discontinued operations
                                                            172,000,000 
        net income attributable to nrg energy, inc.
                                                        942,000,000     
        common share data:
                                                             
        basic shares outstanding — average
                                                        246,000,000    235,000,000 
        diluted shares outstanding — average
                                                        271,000,000    275,000,000 
        shares outstanding — end of year
                                                        254,000,000    234,000,000 
        per share data:
                                                             
        income attributable to nrg from continuing operations — basic
                                                        3,700,000     
        income attributable to nrg from continuing operations — diluted
                                                        3,440,000     
        net income attributable to nrg — basic
                                                        3,700,000     
        net income attributable to nrg — diluted
                                                        3,440,000     
        book value
                                                        29,720,000    26,690,000 
        business metrics:
                                                             
        cash flow from operations
                                                        2,106,000,000    1,434,000,000 
        liquidity position
                                                        3,971,000,000    4,124,000,000 
        ratio of earnings to fixed charges
                                                        3,270,000    3,620,000 
        ratio of earnings to fixed charges and preference dividends
                                                        3,040,000    3,170,000 
        return on equity
                                                        12,240,000    16,710,000 
        ratio of debt to total capitalization
                                                        43,490,000    47,570,000 
        balance sheet data:
                                                             
        long-term debt, including current maturities and capital leases
                                                        8,418,000,000    8,168,000,000 
        accounts receivables
                                                         1,119,000,000 1,186,000,000 399,000,000  
        capital leases and note receivable, less current portion
                                                         507,000,000 483,000,000 403,000,000  
        intangible assets, net of accumulated amortization of 483 and 335, respectively
                                                         1,942,000,000    
        less treasury stock, at cost — 26,080,051 and 29,242,483 shares, respectively
                                                         -782,000,000    
        intangible assets, net of accumulated amortization of 327 and 335, respectively
                                                          2,111,000,000   
        less treasury stock, at cost — 17,200,777 and 29,242,483 shares, respectively
                                                          -532,000,000 -532,000,000  
        intangible assets, net of accumulated amortization of 191 and 335, respectively
                                                           815,000,000  
        net income
                                                            1,188,000,000 
        income from continuing operations — basic
                                                            4,090,000 
        income from continuing operations — diluted
                                                            3,660,000 
        net income — basic
                                                            4,820,000 
        net income — diluted
                                                            4,290,000 
      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 2018-09-30 2017-09-30 2017-06-30 2017-03-31 2016-06-30 2016-03-31 2015-06-30 2015-03-31 2014-09-30 2014-06-30 2014-03-31 2013-06-30 2013-03-31 2012-06-30 2012-03-31 2011-09-30 2010-09-30 2010-06-30 2010-03-31 2009-09-30 2009-06-30 2009-03-31 
                                                           
          cash flows from operating activities
                                                           
          net income
        125,000,000 66,000,000 152,000,000 -104,000,000 750,000,000 643,000,000 -767,000,000 738,000,000 511,000,000 482,000,000 343,000,000 308,000,000 -1,335,000,000 -1,095,000,000 67,000,000 513,000,000 1,736,000,000 -427,000,000 1,618,000,000 1,078,000,000 -82,000,000 -173,000,000 249,000,000 313,000,000 121,000,000 3,385,000,000 372,000,000 202,000,000 482,000,000 -48,000,000      -9,000,000 -136,000,000  -80,000,000 -67,000,000  -327,000,000 259,000,000 -206,000,000 -55,000,000 223,000,000 210,000,000 58,000,000 277,000,000 433,000,000 198,000,000 
          adjustments to reconcile net income to cash (used)/provided by operating activities:
                                                           
          depreciation of property, plant and equipment and amortization of customer relationships and other intangible assets
        277,000,000 229,000,000 223,000,000 226,000,000 218,000,000 257,000,000                                              
          amortization of capitalized contract costs
        155,000,000 147,000,000 137,000,000 118,000,000 108,000,000 101,000,000                                              
          net accretion of/(gain) on asset retirement obligations
        7,000,000                                                   
          provision for credit losses
        59,000,000 71,000,000 88,000,000 57,000,000 56,000,000 86,000,000 95,000,000 58,000,000 75,000,000 86,000,000 85,000,000 45,000,000 35,000,000 -92,000,000 52,000,000 26,000,000 25,000,000 -17,000,000 64,000,000 40,000,000 611,000,000 34,000,000   24,000,000                           
          amortization of financing costs and debt discounts
        5,000,000 27,000,000 11,000,000 7,000,000 6,000,000 7,000,000 11,000,000 10,000,000 11,000,000 10,000,000 11,000,000 11,000,000 20,000,000 6,000,000 6,000,000 5,000,000 6,000,000 9,000,000 10,000,000 9,000,000 11,000,000                               
          amortization of in-the-money contracts and emissions allowances
        36,000,000 22,000,000 24,000,000 7,000,000 44,000,000 22,000,000 10,000,000 -5,000,000 78,000,000 26,000,000 -1,000,000 -7,000,000 119,000,000  -6,000,000 -19,000,000 147,000,000                                   
          amortization of unearned equity compensation
        41,000,000 51,000,000 21,000,000 33,000,000 29,000,000 20,000,000 25,000,000 27,000,000 30,000,000 14,000,000 26,000,000 31,000,000 30,000,000 7,000,000 7,000,000 8,000,000 6,000,000 5,000,000 6,000,000 6,000,000 4,000,000 5,000,000 5,000,000 7,000,000 5,000,000 5,000,000 5,000,000 6,000,000 4,000,000 10,000,000 11,000,000 8,000,000 8,000,000 8,000,000 8,000,000 13,000,000 11,000,000 8,000,000 16,000,000 8,000,000 6,000,000 18,000,000    8,000,000 9,000,000 6,000,000 7,000,000 6,000,000 7,000,000 
          net loss on sale of assets and disposal of assets
        3,000,000 18,000,000 -3,000,000 2,000,000 8,000,000   -1,000,000 9,000,000                                           
          gain on proceeds from insurance recoveries for property, plant and equipment
         -100,000,000                                               
          changes in derivative instruments
        190,000,000 3,000,000 429,000,000 338,000,000 -320,000,000 -605,000,000 1,652,000,000 -849,000,000 -535,000,000 902,000,000 38,000,000 -84,000,000 1,599,000,000 1,259,000,000 -562,000,000 -1,102,000,000 -2,816,000,000 793,000,000 -1,989,000,000 -1,528,000,000 -902,000,000 144,000,000 124,000,000 -85,000,000 -46,000,000 -2,000,000 58,000,000 -7,000,000 -15,000,000 194,000,000 18,000,000 -18,000,000 25,000,000 25,000,000 -50,000,000 -75,000,000 261,000,000 -287,000,000 10,000,000 525,000,000 -143,000,000 317,000,000 -113,000,000 187,000,000        
          changes in current and deferred income taxes and liability for uncertain tax benefits
        -56,000,000 4,000,000 83,000,000 -17,000,000 143,000,000 31,000,000 -256,000,000 251,000,000 139,000,000  57,000,000 56,000,000 -338,000,000                                       
          changes in collateral deposits in support of risk management activities
        -142,000,000 -69,000,000 -121,000,000 -426,000,000 623,000,000 325,000,000 -740,000,000 371,000,000 289,000,000 -618,000,000 167,000,000 57,000,000 -1,412,000,000                                       
          cash provided/(used) by changes in other working capital:
                                                           
          accounts receivable - trade
        809,000,000                                                   
          inventory
        -29,000,000                                                   
          prepayments and other current assets
        -196,000,000                                                   
          accounts payable
        -910,000,000                                                   
          accrued expenses and other current liabilities
        -315,000,000                                                   
          other assets and liabilities
        -228,000,000                                                   
          cash (used)/provided by operating activities
        -169,000,000         241,000,000 566,000,000 570,000,000 -1,598,000,000        -917,000,000                               
          cash flows from investing activities
                                                           
          payments for acquisitions of businesses and assets, net of cash acquired
        -6,755,000,000     -5,000,000 -1,000,000 -10,000,000 -22,000,000 -21,000,000 -4,000,000 -6,000,000 -2,492,000,000  -7,000,000 -27,000,000 -26,000,000                                   
          capital expenditures
          -254,000,000 -378,000,000 -217,000,000         -117,000,000 -100,000,000    -76,000,000                                 
          free cash flows
          230,000,000 73,000,000 638,000,000         -1,515,000,000 -1,531,000,000    1,402,000,000                                 
          proceeds from sales of assets
          6,000,000                                               
          net purchases of emissions allowances
         5,000,000 1,000,000 -4,000,000 -3,000,000 -2,000,000 -5,000,000 -4,000,000 -7,000,000 1,000,000                                          
          proceeds from insurance recoveries for property, plant and equipment
         100,000,000 3,000,000 67,000,000 52,000,000 50,000,000 71,000,000                                       
          cash used by investing activities
        -7,072,000,000   -948,000,000 -134,000,000   -109,000,000 -92,000,000 1,721,000,000 -129,000,000 -152,000,000 -2,350,000,000 -127,000,000 -86,000,000 -39,000,000 -80,000,000  -93,000,000 -128,000,000 -3,364,000,000                               
          cash flows from financing activities
                                                           
          equivalent shares purchased in lieu of tax withholdings
        -79,000,000 -6,000,000 -9,000,000 -37,000,000 -40,000,000 -5,000,000 -10,000,000 -12,000,000 -23,000,000                                           
          payments for share repurchase activity and excise tax
        -481,000,000 -353,000,000                                                  
          payments of dividends to preferred and common stockholders
        -135,000,000 -85,000,000 -119,000,000 -86,000,000 -121,000,000 -83,000,000 -118,000,000 -86,000,000 -118,000,000 -86,000,000                                          
          proceeds from issuance of long-term debt
        57,000,000 5,301,000,000    2,325,000,000   731,000,000        3,175,000,000 59,000,000     -610,000,000 188,000,000 754,000,000 192,000,000 3,162,000,000 61,000,000 381,000,000 248,000,000 570,000,000 2,322,000,000 1,564,000,000 736,000,000 736,000,000 512,000,000 415,000,000 1,912,000,000 1,111,000,000 131,000,000 10,000,000 23,000,000   
          repayments of long-term debt and finance leases
        -12,000,000 -756,000,000 -239,000,000 -5,000,000 -5,000,000  -4,000,000 -859,000,000 -97,000,000  -5,000,000 -6,000,000 -4,000,000  -2,000,000 -1,000,000 -1,000,000  -1,356,000,000 -3,000,000 -1,000,000                               
          payments of deferred financing costs
        -42,000,000 -23,000,000 -24,000,000 -28,000,000 -3,000,000                                               
          net receipts from settlement of acquired derivatives that include financing elements
        19,000,000    25,000,000    8,000,000 10,000,000 14,000,000 -18,000,000 336,000,000  646,000,000 389,000,000 561,000,000              1,000,000 1,000,000 64,000,000 39,000,000                 
          proceeds from credit facilities
        4,850,000,000 710,000,000   425,000,000 100,000,000 525,000,000                                           
          repayments to credit facilities
        -1,525,000,000 -845,000,000   -425,000,000 -100,000,000 -525,000,000                                           
          cash provided/(used) by financing activities
        2,652,000,000             188,000,000                                      
          effect of exchange rate changes on cash and cash equivalents
        2,000,000 2,000,000 1,000,000 -1,000,000 2,000,000 -4,000,000   -2,000,000   3,000,000 2,000,000   3,000,000 -3,000,000 1,000,000 -1,000,000        -2,000,000 -1,000,000 -7,000,000 3,000,000 -6,000,000 -15,000,000 18,000,000 26,000,000 -26,000,000 2,000,000   -2,000,000 1,000,000 -4,000,000 6,000,000 -6,000,000 -3,000,000 2,000,000 3,000,000 -2,000,000 
          net increase in cash and cash equivalents, funds deposited by counterparties and restricted cash
        -4,587,000,000 3,913,000,000 442,000,000 -795,000,000 265,000,000 47,000,000 46,000,000   -26,000,000 -138,000,000 44,000,000 -1,409,000,000 -1,335,000,000 -1,081,000,000 1,598,000,000 1,886,000,000 -911,000,000 1,112,000,000 335,000,000 -3,356,000,000 3,212,000,000   433,000,000 108,000,000   272,000,000                       
          cash and cash equivalents, funds deposited by counterparties and restricted cash at beginning of period
        4,998,000,000 1,173,000,000 649,000,000 2,178,000,000 1,110,000,000 3,930,000,000 385,000,000 613,000,000 -453,000,000                     
          cash and cash equivalents, funds deposited by counterparties and restricted cash at end of period
        411,000,000 3,913,000,000 442,000,000 -795,000,000 1,438,000,000 47,000,000 46,000,000 546,000,000 534,000,000 -26,000,000 -138,000,000 44,000,000 769,000,000 -1,335,000,000 -1,081,000,000 1,598,000,000 2,996,000,000 -911,000,000 1,112,000,000 335,000,000 574,000,000 3,212,000,000 256,000,000 -356,000,000 818,000,000 108,000,000 -59,000,000 -549,000,000 885,000,000 80,000,000 551,000,000                     
          adjustments to reconcile net income to cash from operating activities:
                                                           
          accretion of asset retirement obligations
         7,000,000 2,000,000   5,000,000 26,000,000 -1,000,000 4,000,000 13,000,000 9,000,000 -1,000,000 6,000,000 35,000,000 4,000,000 9,000,000 7,000,000 9,000,000 7,000,000 11,000,000 3,000,000  28,000,000 7,000,000 11,000,000                           
          amortization of nuclear fuel
                 5,000,000 16,000,000 13,000,000 13,000,000 12,000,000 14,000,000 14,000,000 14,000,000 12,000,000 14,000,000 12,000,000 13,000,000 14,000,000 15,000,000 12,000,000 13,000,000 12,000,000 13,000,000 14,000,000 13,000,000 14,000,000 13,000,000 12,000,000 12,000,000 13,000,000 13,000,000 10,000,000 13,000,000 13,000,000 9,000,000 11,000,000 10,000,000 6,000,000 10,000,000 6,000,000 11,000,000 11,000,000 9,000,000 10,000,000 9,000,000 9,000,000 10,000,000 
          loss on debt extinguishment
           122,000,000 202,000,000 58,000,000         20,000,000    8,000,000 1,000,000 4,000,000             19,000,000  2,000,000   32,000,000       
          impairment losses
             28,000,000       8,000,000 43,000,000   238,000,000   46,000,000 29,000,000 18,000,000 5,000,000 107,000,000   14,000,000   108,000,000 146,000,000                 
          equity in and distributions from earnings of unconsolidated affiliates
         -6,000,000 -1,000,000 -1,000,000  -2,000,000 -2,000,000 -2,000,000                                           
          cash (used)/provided by changes in other working capital:
                                                           
          cash provided/(used) by operating activities
             952,000,000 31,000,000 1,056,000,000 267,000,000        1,676,000,000                                   
          proceeds from sales of assets, net of cash disposed
              484,000,000 8,000,000 3,000,000  10,000,000 219,000,000  11,000,000                                     
          investments in nuclear decommissioning trust fund securities
                 -74,000,000 -108,000,000 -98,000,000 -87,000,000 -93,000,000 -90,000,000 -120,000,000 -151,000,000 -291,000,000 -207,000,000 -124,000,000 -129,000,000 -132,000,000 -103,000,000 -136,000,000 -121,000,000 -121,000,000 -86,000,000 -87,000,000 -122,000,000 -103,000,000 -123,000,000 -126,000,000 -153,000,000 -80,000,000 -200,000,000 -161,000,000 -193,000,000 -135,000,000 -152,000,000 -188,000,000 -138,000,000 -95,000,000 -110,000,000 -126,000,000 -149,000,000 -169,000,000 2,000,000 -78,000,000 -65,000,000 -89,000,000 -83,000,000 
          proceeds from the sale of nuclear decommissioning trust fund securities
                  100,000,000 81,000,000 99,000,000  85,000,000 117,000,000 161,000,000  198,000,000 108,000,000 118,000,000  98,000,000 108,000,000 112,000,000  80,000,000 78,000,000 113,000,000 95,000,000 105,000,000 160,000,000 117,000,000 76,000,000 191,000,000 162,000,000 196,000,000               
          proceeds from issuance of preferred stock, net of fees
                 -1,000,000 636,000,000                                       
          payment for settlement of capped call options
                                                          
          payments for debt extinguishment costs
             -4,000,000 -1,000,000 -199,000,000 -58,000,000         -17,000,000        -2,000,000                         
          net receipts/(payments) from settlement of acquired derivatives that include financing elements
         8,000,000 13,000,000               542,000,000 205,000,000                                 
          changes in other working capital
          -561,000,000 170,000,000 -699,000,000  -310,000,000 -43,000,000 -668,000,000  -480,000,000 -188,000,000 -317,000,000  -379,000,000 -161,000,000 -171,000,000  -308,000,000 178,000,000 -843,000,000  -38,000,000 -100,000,000 -99,000,000  -214,000,000 -118,000,000 -270,000,000 26,000,000 -1,000,000                     
          cash from operating activities
          484,000,000 451,000,000 855,000,000         -1,398,000,000 -1,431,000,000    1,478,000,000                                 
          payments for acquisitions of businesses and assets
          -5,000,000                                                 
          cash (used)/provided by investing activities
                                                           
          cash used by financing activities
          215,000,000 -297,000,000 -458,000,000                                               
          payments for share repurchase activity
           -289,000,000 -314,000,000  -226,000,000   -1,103,000,000 -53,000,000 -8,000,000 -8,000,000 -122,000,000 -118,000,000 -178,000,000 -188,000,000 -39,000,000 -9,000,000 -50,000,000 -179,000,000                           
          net (gain) on/accretion of asset retirement obligations
            -10,000,000                                               
          payments for acquisitions of assets
            -20,000,000                                               
          adjustments to reconcile net income to net cash from operating activities:
                                                           
          equity in earnings of unconsolidated affiliates, net of distributions
                                                           
          net gain on sale of assets and disposal of assets
             5,000,000    -1,372,000,000 -187,000,000                                       
          changes in nuclear decommissioning trust liability
                  -6,000,000 18,000,000 -16,000,000 7,000,000 7,000,000 2,000,000 -7,000,000 2,000,000 8,000,000 15,000,000 15,000,000 12,000,000 3,000,000 28,000,000 8,000,000 10,000,000 10,000,000 8,000,000 9,000,000 9,000,000 18,000,000 -34,000,000 36,000,000 4,000,000 9,000,000 -1,000,000 -3,000,000 6,000,000 1,000,000 5,000,000 15,000,000 10,000,000 9,000,000 8,000,000 7,000,000 17,000,000 -2,000,000 11,000,000 4,000,000 9,000,000 6,000,000 
          uplift securitization proceeds received from ercot
                                                          
          proceeds from sale of assets, net of cash disposed
                        14,000,000  1,000,000 197,000,000                               
          proceeds from sales of nuclear decommissioning trust fund securities
                                             129,000,000 151,000,000 183,000,000 123,000,000 85,000,000 101,000,000 119,000,000 142,000,000 152,000,000 67,000,000 61,000,000 79,000,000 78,000,000 
          payments for current and long-term debt
                                                           
          payments of debt issuance costs
             -32,000,000 -1,000,000   -3,000,000 -7,000,000 -4,000,000 -18,000,000 -8,000,000    -16,000,000 -2,000,000 -51,000,000                              
          net (payments)/receipts from settlement of acquired derivatives that include financing elements
             -1,000,000 10,000,000                                             
          cash (used)/provided by financing activities
             -714,000,000 -350,000,000 -403,000,000 -288,000,000                                           
          adjustments to reconcile net income to cash provided/(used) by operating activities:
                                                           
          cash provided/(used) by investing activities
                                                           
          net proceeds of revolving credit facility and receivable securitization facilities
                                                           
          depreciation and amortization
               285,000,000 268,000,000 314,000,000 308,000,000 315,000,000 190,000,000 149,000,000 145,000,000 157,000,000 183,000,000 216,000,000 199,000,000 53,000,000 317,000,000 117,000,000 99,000,000 110,000,000 109,000,000      272,000,000 217,000,000 300,000,000 309,000,000 313,000,000 396,000,000 395,000,000 375,000,000 386,000,000 335,000,000 305,000,000 298,000,000 234,000,000 230,000,000 238,000,000 210,000,000 208,000,000 202,000,000 212,000,000 213,000,000 169,000,000 
          net decrease in cash and cash equivalents, funds deposited by counterparties and restricted cash
                -115,000,000                                           
          equity in and distributions from losses of unconsolidated affiliates
                 10,000,000                                          
          changes in deferred income taxes and liability for uncertain tax benefits
                     -306,000,000 16,000,000 145,000,000 527,000,000 -178,000,000 525,000,000 328,000,000 -71,000,000 26,000,000 86,000,000 97,000,000 19,000,000 -3,350,000,000 2,000,000 -3,000,000 -2,000,000 -10,000,000 18,000,000 7,000,000 1,000,000 26,000,000 -25,000,000 -15,000,000 -83,000,000 439,000,000 -403,000,000 -111,000,000 -12,000,000 -212,000,000 -16,000,000 -129,000,000 -81,000,000       
          uplift securitization proceeds received/(receivable) from ercot
                                                           
          cash (used)/provided by changes in other working capital, net of acquisition and disposition effects:
                                                           
          payments for short and long-term debt
                                 -84,000,000 -2,000,000   -122,000,000 -182,000,000 -353,000,000 -177,000,000 -3,191,000,000 -316,000,000 -568,000,000 -94,000,000 -339,000,000 -2,096,000,000 -873,000,000 -597,000,000 -219,000,000 -87,000,000 -34,000,000 -1,617,000,000 -70,000,000 -30,000,000 -429,000,000 -15,000,000 -24,000,000 -209,000,000 
          proceeds from issuance of common stock
                         1,000,000   1,000,000 2,000,000       1,000,000 7,000,000 5,000,000 3,000,000 8,000,000 1,000,000   1,000,000 2,000,000    
          net proceeds of revolving credit facility
                  -400,000,000                                         
          cash from financing activities
                  -572,000,000 -374,000,000 2,536,000,000   127,000,000 287,000,000    924,000,000                               
          distributions from and equity in losses of unconsolidated affiliates
                   -4,000,000 -5,000,000    18,000,000    17,000,000    16,000,000                           
          net purchases of emission allowances
                   -7,000,000 -18,000,000    -18,000,000    -5,000,000   4,000,000 -8,000,000                           
          payments of dividends to common stockholders
                   -87,000,000 -87,000,000 -80,000,000 -84,000,000 -83,000,000 -85,000,000 -80,000,000 -80,000,000 -79,000,000 -80,000,000 -74,000,000 -73,000,000 -74,000,000 -74,000,000 -8,000,000 -8,000,000 -8,000,000 -8,000,000                       
          net proceeds of revolving credit facility and receivables securitization facilities
                    950,000,000        825,000,000                               
          distributions from and equity in earnings of unconsolidated affiliates
                     -9,000,000   12,000,000 -6,000,000                                 
          amortization of in-the-money contracts and emission allowances
                                                           
          oil lower of cost or market adjustment
                                                           
          payments for acquisitions of assets, businesses and leases
                                                           
          proceeds from sale of assets, net of cash disposed and fees
                                                           
          changes in investments in unconsolidated affiliates
                                   4,000,000 -60,000,000                      
          repayments of revolving credit facility
                                                           
          purchase of and distributions to noncontrolling interests from subsidiaries
                             -2,000,000                           
          net gain on sale and disposal of assets
                      -36,000,000 -40,000,000 -6,000,000  -4,000,000                                 
          changes in collateral deposits in support of energy risk management activities
                      -800,000,000 1,114,000,000 2,007,000,000  1,274,000,000 695,000,000 1,000,000  38,000,000 49,000,000 9,000,000  4,000,000 248,000,000 -123,000,000 -12,000,000                      
          net (purchases)/sales of emission allowances
                      15,000,000                                     
          income from discontinued operations, net of income tax
                                 -78,000,000 -2,000,000 13,000,000 388,000,000                       
          income from continuing operations
                             -173,000,000 249,000,000 313,000,000 121,000,000 3,463,000,000 374,000,000   247,000,000                      
          uplift securitization proceeds receivable from ercot
                                                           
          cash from continuing operations
                             451,000,000 694,000,000   552,000,000 472,000,000   234,000,000 732,000,000                     
          cash from discontinued operations
                                 8,000,000                       
          net cash from operating activities
                             451,000,000 694,000,000   552,000,000 472,000,000   558,000,000 732,000,000   319,000,000 554,000,000 198,000,000 260,000,000        359,000,000 536,000,000 491,000,000 114,000,000 558,000,000 583,000,000 139,000,000 
          net (purchases)/sales of emissions allowances
                                                           
          proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees
                             66,000,000 15,000,000 1,000,000 4,000,000 -24,000,000 1,313,000,000                       
          net contributions to discontinued operations
                                                           
          other
                              -1,000,000      -1,000,000  4,000,000 18,000,000 28,000,000 4,000,000 50,000,000 -41,000,000 -67,000,000 -6,000,000 3,000,000 -19,000,000 -1,000,000 -51,000,000 7,000,000 3,000,000 -6,000,000 -2,000,000 -5,000,000    
          cash (used)/provided by continuing operations
                             -10,000,000 -339,000,000 -77,000,000 -68,000,000   -1,628,000,000 -135,000,000                       
          cash used by discontinued operations
                                 -2,000,000                       
          net cash (used)/provided by investing activities
                             -10,000,000 -339,000,000 -77,000,000 -68,000,000            -270,000,000               
          net (repayments)/proceeds of revolving credit facility
                                                          
          net cash (used)/provided by financing activities
                                         -266,000,000 -264,000,000                 
          change in cash from discontinued operations
                                 49,000,000                      
          amortization of in-the-money contracts, emissions allowances and retirements of recs
                          3,000,000                                 
          payments for acquisitions of businesses, net of cash acquired
                          -13,000,000 -39,000,000 -3,482,000,000                               
          net sales/(purchases) of emission allowances
                          5,000,000                                 
          net repayments of revolving credit facility and receivables securitization facilities
                                                           
          net proceeds/(repayments) of revolving credit facility and receivables securitization facilities
                                                           
          amortization of emissions allowances and energy credits
                            7,000,000  27,000,000 26,000,000 7,000,000                           
          gain on sale and disposal of assets
                            -18,000,000                               
          net payments from settlement of acquired derivatives that include financing elements
                            190,000,000                               
          accretion expense related to asset retirement obligations
                                                           
          amortization of emission allowances, out-of-market contracts and rec retirements
                                                           
          genon settlement, net of insurance proceeds
                                                           
          net loss on deconsolidation of agua caliente and ivanpah projects
                                                           
          cash provided/(used) by changes in other working capital, net of acquisition and disposition effects:
                                                           
          deconsolidations of agua caliente and ivanpah projects
                                                           
          receivable from affiliate
                                                          
          cash provided/(used) by continuing operations
                                208,000,000   -93,000,000 1,198,000,000  41,000,000                     
          net cash provided/(used) by financing activities
                                293,000,000      41,000,000            488,000,000 527,000,000        
          amortization of financing costs and debt discount/premiums
                              11,000,000 6,000,000 6,000,000 6,000,000 7,000,000 6,000,000 7,000,000 -6,000,000 15,000,000 28,000,000 1,000,000 2,000,000 1,000,000 -3,000,000 -4,000,000 -4,000,000 -5,000,000 -13,000,000 -13,000,000 9,000,000 8,000,000 9,000,000 8,000,000 7,000,000 8,000,000 14,000,000 12,000,000 9,000,000 
          payments for acquisitions of assets and businesses
                                                           
          net proceeds from notes receivable
                                                           
          contributions to discontinued operations
                                  -44,000,000                       
          repayments of long-term debt
                              -1,000,000 -1,000,000 -60,000,000                           
          cash used by continuing operations
                              -98,000,000   -386,000,000   -791,000,000 77,000,000 -220,000,000                     
          net cash used by financing activities
                              -98,000,000   -386,000,000   -748,000,000    -153,000,000               -408,000,000   -184,000,000 
          distributions from and equity in (earnings)/losses of unconsolidated affiliates
                                                           
          benefit from credit losses
                                                           
          (gain)/loss on sale of assets and disposal of assets
                                                           
          payments for acquisitions of businesses
                                 -7,000,000 -327,000,000 -5,000,000 -16,000,000                       
          net distributions from investments in unconsolidated affiliates
                                                           
          payment of debt issuance costs
                                  -1,000,000   18,000,000 -7,000,000 -21,000,000 -15,000,000     -14,000,000 -20,000,000 -23,000,000     -97,000,000       
          net repayment of revolving credit facility
                                                           
          net increase/(decrease) in cash and cash equivalents, funds deposited by counterparties and restricted cash
                                                           
          loss on sale of assets and disposal of assets
                                -14,000,000                           
          net cash provided/(used) by operating activities
                                208,000,000              -21,000,000 391,000,000            
          net proceeds from revolving credit facility
                                552,000,000                           
          distributions and equity in earnings of unconsolidated affiliates
                                     -17,000,000 -2,000,000 18,000,000 8,000,000 15,000,000 17,000,000 8,000,000 32,000,000 -7,000,000 41,000,000 -2,000,000      -10,000,000 -4,000,000 -5,000,000    
          provision for bad debts
                                 8,000,000   26,000,000 26,000,000                      
          amortization of emission allowances and out-of-market contracts
                                                           
          net proceeds from sale of emission allowances
                                 -3,000,000 15,000,000                         
          net contributions to investments in unconsolidated affiliates
                                 3,000,000                          
          net (contributions to)/distributions from discontinued operations
                                                           
          net cash provided/(used) by investing activities
                                 -58,000,000 -489,000,000 -93,000,000 1,196,000,000           124,000,000            
          net distributions to noncontrolling interest from subsidiaries
                                                           
          proceeds from issuance of short and long-term debt
                                 -132,000,000 215,000,000                         
          cash provided/(used) by discontinued operations
                                                           
          distributions and equity earnings of unconsolidated affiliates
                                  -27,000,000                         
          depreciation, amortization and accretion
                                  105,000,000 92,000,000 92,000,000 -82,000,000                      
          amortization of emissions allowances and out-of-market contracts
                                                           
          genon settlement
                                                           
          loss on deconsolidation of agua caliente and ivanpah projects
                                                           
          deconsolidation of agua caliente and ivanpah projects
                                                           
          payments for treasury stock
                                  -247,000,000 -292,000,000 -747,000,000                       
          distributions to noncontrolling interests from subsidiaries
                                  -1,000,000                       
          benefit from bad debts
                                      39,000,000 9,000,000 9,000,000 10,000,000 10,000,000 14,000,000 15,000,000 19,000,000 9,000,000 21,000,000 14,000,000 9,000,000 10,000,000 7,000,000 21,000,000 24,000,000 13,000,000 9,000,000 28,000,000   
          amortization of intangibles and out-of-market contracts
                                   8,000,000 6,000,000 -27,000,000 28,000,000 41,000,000 10,000,000 15,000,000 26,000,000 13,000,000 19,000,000 30,000,000 9,000,000 13,000,000 93,000,000 31,000,000    -18,000,000   64,000,000 49,000,000 -34,000,000 
          loss/(gain) on sale and disposal of assets
                                                           
          loss on deconsolidation of ivanpah project
                                                           
          deconsolidation of ivanpah project
                                                           
          net income from continuing operations
                                    94,000,000                       
          equity in losses of unconsolidated affiliates
                                    21,000,000                       
          adjustment for debt extinguishment
                                     19,000,000     -11,000,000   3,000,000              
          loss on sale and disposal of assets
                                    3,000,000                       
          net cash (used)/provided by operating activities
                                    -127,000,000    -68,000,000           -76,000,000        
          payments for long-term debt
                                    -37,000,000                       
          loss from discontinued operations, net of income tax
                                     -295,000,000                      
          gain on sale of emission allowances
                                     -9,000,000                   1,000,000 -2,000,000 -7,000,000 
          gain on sale of assets
                                     -14,000,000   -2,000,000     -7,000,000 -19,000,000       10,000,000 -21,000,000   -1,000,000 
          genon settlement in july 2018
                                                           
          loss on deconsolidation of business
                                     -9,000,000                      
          acquisitions of businesses, net of cash acquired
                                     75,000,000 -20,000,000 -13,000,000 -3,000,000 -11,000,000 -6,000,000 -29,000,000 -1,000,000 -1,015,000,000 -1,599,000,000 -218,000,000 -21,000,000 -18,000,000   -284,000,000       
          purchases of emission allowances
                                     -8,000,000 -17,000,000 -21,000,000 -9,000,000 -15,000,000 -12,000,000          -10,000,000 -11,000,000 -11,000,000 -34,000,000 -16,000,000 -17,000,000 -35,000,000 
          proceeds from sale of emission allowances
                                     20,000,000 10,000,000   47,000,000          2,000,000 3,000,000 2,000,000 9,000,000 5,000,000 7,000,000 8,000,000 
          deconsolidation of business
                                     -108,000,000                      
          net cash (used) by investing activities
                                                           
          payment of dividends to common stockholders
                                                           
          payment for treasury stock
                                     -500,000,000      -107,000,000 -79,000,000    -5,000,000 -20,000,000   -248,000,000 -130,000,000      
          net distributions to noncontrolling interests from subsidiaries
                                                           
          adjustments to reconcile net income to net cash provided/(used) by operating activities:
                                                           
          decrease in notes receivable
                                        4,000,000  1,000,000 2,000,000 5,000,000        7,000,000   7,000,000   3,000,000 
          proceeds from renewable energy grants and state rebates
                                        2,000,000 8,000,000 59,000,000 2,000,000               
          proceeds from sale of assets, net of cash disposed of
                                      1,000,000 21,000,000 14,000,000 25,000,000 120,000,000   76,000,000 77,000,000            
          net cash used by investing activities
                                      -220,000,000 -313,000,000 -232,000,000 -326,000,000 -143,000,000   -1,205,000,000   -539,000,000 -836,000,000 -1,012,000,000 -543,000,000 -1,102,000,000 -185,000,000 -191,000,000 -194,000,000 -227,000,000 -241,000,000 -259,000,000 
          payment of dividends to common and preferred stockholders
                                      -9,000,000 -10,000,000 -9,000,000 -9,000,000 -48,000,000 -51,000,000 -51,000,000 -49,000,000 -50,000,000 -41,000,000 -42,000,000 -31,000,000          
          increase in notes receivable from affiliate
                                                           
          net contributions from noncontrolling interests in subsidiaries
                                                           
          other - contingent consideration
                                      -10,000,000 -10,000,000                 
          net cash from financing activities
                                           389,000,000 40,000,000 907,000,000 218,000,000 416,000,000 156,000,000 580,000,000          
          net (loss)/income
                                        -203,000,000                   
          (loss)/income from discontinued operations, net of income tax
                                                           
          income/(loss) from continuing operations
                                                           
          adjustments to reconcile net (loss)/income to net cash from operating activities:
                                                           
          changes in collateral posted in support of risk management activities
                                      86,000,000 -115,000,000 -74,000,000                   
          (gain)/loss on sale of assets
                                                           
          cash (used)/provided by discontinued operations
                                                           
          investments in unconsolidated affiliates
                                      -1,000,000 -18,000,000 -12,000,000  -4,000,000          -2,000,000       
          payment for preferred shares
                                                           
          contributions from, net of distributions to, noncontrolling interest in subsidiaries
                                                           
          proceeds from issuance of stock
                                                           
          loss on sale of assets
                                                           
          cash (used) by discontinued operations
                                                           
          increase in notes receivable
                                                -2,000,000 -9,000,000          
          distributions to, net of contributions from, noncontrolling interest in subsidiaries
                                                           
          cash used by changes in other working capital
                                        -199,000,000 -234,000,000 -121,000,000 -255,000,000 -33,000,000 -297,000,000 -129,000,000 65,000,000 -421,000,000 -37,000,000 -225,000,000 -42,000,000 80,000,000   -182,000,000   -233,000,000 
          decrease/(increase)in restricted cash
                                        13,000,000                   
          decrease in restricted cash to support equity requirements for u.s. doe funded projects
                                        36,000,000  39,000,000 2,000,000 25,000,000   56,000,000  12,000,000  95,000,000        
          payment for credit support in long-term deposits
                                        -130,000,000                   
          proceeds from draw on revolving credit facility for long-term deposits
                                        125,000,000                   
          increase in long-term deposits
                                        -125,000,000                   
          contributions to, net of distributions from, noncontrolling interest in subsidiaries
                                        -5,000,000    -25,000,000               
          net (decrease)/ increase in cash and cash equivalents
                                        -460,000,000                   
          cash and cash equivalents at beginning of period
                                        1,973,000,000 1,518,000,000 2,116,000,000 2,254,000,000 2,087,000,000 1,105,000,000 2,304,000,000 1,494,000,000 
          cash and cash equivalents at end of period
                                        1,513,000,000 -270,000,000 1,659,000,000 -18,000,000 2,164,000,000 472,000,000 -1,706,000,000 3,187,000,000 -339,000,000 1,707,000,000 135,000,000 1,014,000,000 -812,000,000 1,279,000,000 355,000,000 1,813,000,000 -32,000,000 1,094,000,000 1,188,000,000 
          adjustment to loss on debt extinguishment
                                                           
          changes in collateral deposits supporting energy risk management activities
                                         194,000,000 156,000,000 101,000,000 -213,000,000 197,000,000 110,000,000 -407,000,000 68,000,000 -226,000,000 427,000,000 -187,000,000 -62,000,000 -86,000,000 142,000,000 -172,000,000 -232,000,000 -67,000,000 312,000,000 
          loss/(gain) on sale of assets and postretirement benefits curtailment
                                                           
          decrease/(increase) in restricted cash
                                               3,000,000            
          (increase)/decrease in restricted cash to support equity requirements for u.s. doe funded projects
                                                           
          (increase)/decrease in notes receivable
                                                  -14,000,000 -7,000,000     -7,000,000   
          distributions from, net of contributions to, noncontrolling interest in subsidiaries
                                         -31,000,000 10,000,000                 
          net (decrease)/increase in cash and cash equivalents
                                                           
          net income/
                                          47,000,000                 
          adjustments to reconcile net income/(loss) to net cash from operating activities:
                                                           
          gain on sale of assets and postretirement benefits curtailment
                                          -32,000,000                 
          increase in restricted cash
                                          -12,000,000   -46,000,000   -18,000,000 -13,000,000 -38,000,000 -20,000,000 -50,000,000 -6,000,000 -6,000,000 -5,000,000 -7,000,000 -2,000,000 -1,000,000 
          net increase in cash and cash equivalents
                                          141,000,000  48,000,000            -32,000,000   
          loss on sale of emission allowances
                                                           
          gain on postretirement benefits curtailment and sale of assets
                                           -14,000,000               
          cash proceeds to fund cash grant bridge loan payment
                                             57,000,000            
          net receipts from/(payments for) settlement of acquired derivatives that include financing elements
                                           51,000,000 40,000,000               
          net increase/ (decrease) in cash and cash equivalents
                                                           
          (increase)/decrease in restricted cash
                                            -11,000,000               
          loss/(gain) on sale of emission allowances
                                                     1,000,000      
          decrease/(increase) in restricted cash to support equity requirements for u.s. doe funded projects
                                                          
          decrease/(increase) in notes receivable
                                             19,000,000 1,000,000 1,000,000      13,000,000      
          proceeds from renewable energy grants
                                             2,000,000 42,000,000 387,000,000 32,000,000 16,000,000 7,000,000 28,000,000       
          net (payments for)/receipts from settlement of acquired derivatives that include financing elements
                                             103,000,000 56,000,000 -223,000,000     -15,000,000       
          contributions and sale proceeds from noncontrolling interest in subsidiaries
                                             629,000,000 1,000,000 9,000,000            
          net decrease in cash and cash equivalents
                                                 -380,000,000  -91,000,000    -491,000,000   -306,000,000 
          net increase/(decrease) in cash and cash equivalents
                                               933,000,000            
          adjustments to reconcile net (loss)/income to net cash used by operating activities:
                                                           
          adjustments to reconcile net income to net cash used by operating activities:
                                                           
          net cash used by operating activities
                                                 -124,000,000          
          net receipts/(payments for) settlement of acquired derivatives that include financing elements
                                                 98,000,000          
          sale proceeds and other contributions from noncontrolling interests in subsidiaries
                                                 20,000,000 92,000,000 178,000,000        
          payment of debt issuance and hedging costs
                                                 -5,000,000 -2,000,000 -10,000,000        
          amortization of intangibles and out-of-market commodity contracts
                                                  39,000,000 42,000,000        
          impairment charge on investment
                                                          
          payment of dividends to preferred stockholders
                                                  -3,000,000 -2,000,000 -2,000,000 -2,000,000 -3,000,000 -2,000,000 -6,000,000 -7,000,000 -14,000,000 
          net payments for settlement of acquired derivatives that include financing elements
                                                  -24,000,000 -20,000,000        
          adjustments to reconcile net income to net cash (used)/provided by operating activities:
                                                           
          impairment charge on emission allowances
                                                           
          increase in restricted cash to support equity requirements for u.s. doe funded projects
                                                    -246,000,000       
          proceeds from sale of assets
                                                    1,000,000 30,000,000 2,000,000 4,000,000 
          installment proceeds from sale of noncontrolling interest in subsidiary
                                                          
          proceeds from issuance of term loan for funded letter of credit facility
                                                          
          decrease/(increase) in restricted cash supporting funded letter of credit
                                                           
          payment for settlement of funded letter of credit facility
                                                           
          changes in derivatives
                                                     7,000,000 -79,000,000 24,000,000 134,000,000 -64,000,000 -304,000,000 
          increase in restricted cash supporting funded letter of credit
                                                           
          (gain)/loss on sale and disposal of assets
                                                           
          gain on sale of equity method investment
                                                          
          gain recognized on settlement of pre-existing relationship
                                                          
          changes in option premiums collected, net of acquisition
                                                     26,000,000      
          cash used by changes in other working capital, net of acquisition
                                                     17,000,000      
          acquisition of businesses, net of cash acquired
                                                     -1,000,000      
          proceeds from sale of equity method investment
                                                          
          net receipt from/(payments for) acquired derivatives that include financing elements
                                                     31,000,000      
          increase in restricted cash supporting funded letter of credit facility
                                                     -1,000,000      
          payment of deferred debt issuance costs
                                                     -17,000,000 -51,000,000 -2,000,000 -28,000,000 -1,000,000 
          changes in deferred income taxes and liability for unrecognized tax benefits
                                                      105,000,000 74,000,000 116,000,000 146,000,000 299,000,000 
          changes in option premiums collected
                                                       92,000,000   -270,000,000 
          net receipts from acquired derivatives that include financing elements
                                                       13,000,000    
          gain on sale of discontinued operations
                                                           
          acquisition of reliant energy, net of cash acquired
                                                        -11,000,000   
          proceeds from sale of discontinued operations, net of cash divested
                                                           
          equity investment in unconsolidated affiliate
                                                           
          other investments
                                                           
          net payments to settle acquired derivatives that include financing elements
                                                           
          payment to settle csf i cagr
                                                           
          proceeds from issuance of common stock, net of issuance costs
                                                           
          net cash provided by/(used by) financing activities
                                                        -365,000,000   
          distributions and equity in (earnings)/losses of unconsolidated affiliates
                                                         -5,000,000 -22,000,000 
          proceeds from sale of discontinued operations and assets, net of cash divested
                                                           
          other investment
                                                           
          equity investment in unconsolidated affiliates
                                                           
          payment of financing element of acquired derivatives
                                                           
          proceeds from sale of noncontrolling interest in subsidiary
                                                           
          adjustments to reconcile net income to net cash from operating activities
                                                           
          receipt from/(payment of) financing element of acquired derivatives
                                                          40,000,000