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Condensed Consolidating Financial Information - Statements of Operations (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Revenues                        
Total operating revenues   $ 2,195 $ 2,996 $ 2,465 $ 2,165 $ 1,992 $ 2,960 $ 2,461 $ 2,065 $ 9,821 $ 9,478 $ 9,074
Operating Costs and Expenses                        
Cost of operations                   7,303 7,108 6,886
Depreciation and amortization                   373 421 596
Impairment losses                   5 99 1,534
Selling, general and administrative                   827 799 836
Reorganization costs                   23 90 44
Development costs                   7 11 22
Total operating costs and expenses                   8,538 8,528 9,918
Other income - affiliate $ 84                 0 0 87
(Loss)/Gain on sale of assets                   7 32 16
Operating Income/(Loss)   209 540 320 221 49 398 174 361 1,290 982 (741)
Other Income/(Expense)                        
Equity in earnings of consolidated subsidiaries                   0 0 0
Equity in earnings/(losses) of unconsolidated affiliates                   2 9 (14)
Impairment losses on investments                   (108) (15) (79)
Other income, net                   66 18 51
Loss on debt extinguishment, net                   (51) (44) (49)
Interest expense                   (413) (483) (557)
Total other expense                   (504) (515) (648)
Income/(Loss) from Continuing Operations Before Income Taxes                   786 467 (1,389)
Income/(Loss) from Continuing Operations                   (3,334) 7 (44)
Income/(Loss) from Continuing Operations   3,463 374 189 94 (93) 287 27 238 4,120 460 (1,345)
Income/(loss) from discontinued operations, net of income tax   (78) (2) 13 388 80 (336) 69 (5) 321 (192) (992)
Net Income/(Loss)   3,385 372 202 482 (13) (49) 96 233 4,441 268 (2,337)
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests   $ 2 $ 0 $ 1 $ 0 $ (2) $ 23 $ 24 $ (46) 3 0 (184)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   4,438 268 (2,153)
Eliminations                        
Operating Revenues                        
Total operating revenues                   (11) (26) (48)
Operating Costs and Expenses                        
Cost of operations                   (11) (26) (46)
Depreciation and amortization                   0 0 0
Impairment losses                   0 0 0
Selling, general and administrative                   0 (74) (2)
Reorganization costs                   0 0 0
Development costs                   0 (1) 0
Total operating costs and expenses                   (11) (101) (48)
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 0 0
Operating Income/(Loss)                   0 75 0
Other Income/(Expense)                        
Equity in earnings of consolidated subsidiaries                   (1,610) (1,314) (46)
Equity in earnings/(losses) of unconsolidated affiliates                   0 0 0
Impairment losses on investments                   0 0 0
Other income, net                   0 0 0
Loss on debt extinguishment, net                   0 0 0
Interest expense                   0 0 0
Total other expense                   (1,610) (1,314) (46)
Income/(Loss) from Continuing Operations Before Income Taxes                   (1,610) (1,239) (46)
Income/(Loss) from Continuing Operations                   0 0 0
Income/(Loss) from Continuing Operations                   (1,610) (1,239) (46)
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   (1,610) (1,239) (46)
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests                   0 75 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   (1,610) (1,314) (46)
Guarantor Subsidiaries                        
Operating Revenues                        
Total operating revenues                   8,041 8,119 7,818
Operating Costs and Expenses                        
Cost of operations                   5,936 6,147 5,998
Depreciation and amortization                   212 238 343
Impairment losses                   1 6 1,346
Selling, general and administrative                   466 462 410
Reorganization costs                   0 4 6
Development costs                   0 0 0
Total operating costs and expenses                   6,615 6,857 8,103
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   1 4 4
Operating Income/(Loss)                   1,427 1,266 (281)
Other Income/(Expense)                        
Equity in earnings of consolidated subsidiaries                   48 23 18
Equity in earnings/(losses) of unconsolidated affiliates                   0 0 0
Impairment losses on investments                   0 0 0
Other income, net                   23 32 9
Loss on debt extinguishment, net                   0 0 0
Interest expense                   (14) (14) (14)
Total other expense                   57 41 13
Income/(Loss) from Continuing Operations Before Income Taxes                   1,484 1,307 (268)
Income/(Loss) from Continuing Operations                   0 372 (598)
Income/(Loss) from Continuing Operations                   1,484 935 330
Income/(loss) from discontinued operations, net of income tax                   9 62 91
Net Income/(Loss)                   1,493 997 421
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests                   0 0 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   1,493 997 421
Non-Guarantor Subsidiaries                        
Operating Revenues                        
Total operating revenues                   1,791 1,385 1,304
Operating Costs and Expenses                        
Cost of operations                   1,351 959 862
Depreciation and amortization                   130 150 221
Impairment losses                   4 93 188
Selling, general and administrative                   83 63 64
Reorganization costs                   0 0 0
Development costs                   0 1 4
Total operating costs and expenses                   1,568 1,266 1,339
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 28 12
Operating Income/(Loss)                   223 147 (23)
Other Income/(Expense)                        
Equity in earnings of consolidated subsidiaries                   0 0 0
Equity in earnings/(losses) of unconsolidated affiliates                   2 10 (10)
Impairment losses on investments                   (101) (15) (75)
Other income, net                   12 (13) 14
Loss on debt extinguishment, net                   (3) 0 0
Interest expense                   (14) (49) (91)
Total other expense                   (104) (67) (162)
Income/(Loss) from Continuing Operations Before Income Taxes                   119 80 (185)
Income/(Loss) from Continuing Operations                   4 19 (62)
Income/(Loss) from Continuing Operations                   115 61 (123)
Income/(loss) from discontinued operations, net of income tax                   5 75 (420)
Net Income/(Loss)                   120 136 (543)
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests                   3 (181) (168)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   117 317 (375)
NRG Energy, Inc. (Note Issuer)                        
Operating Revenues                        
Total operating revenues                   0 0 0
Operating Costs and Expenses                        
Cost of operations                   27 28 72
Depreciation and amortization                   31 33 32
Impairment losses                   0 0 0
Selling, general and administrative                   278 348 364
Reorganization costs                   23 86 38
Development costs                   7 11 18
Total operating costs and expenses                   366 506 524
Other income - affiliate                       87
(Loss)/Gain on sale of assets                   6 0 0
Operating Income/(Loss)                   (360) (506) (437)
Other Income/(Expense)                        
Equity in earnings of consolidated subsidiaries                   1,562 1,291 28
Equity in earnings/(losses) of unconsolidated affiliates                   0 (1) (4)
Impairment losses on investments                   (7) 0 (4)
Other income, net                   31 (1) 28
Loss on debt extinguishment, net                   (48) (44) (49)
Interest expense                   (385) (420) (452)
Total other expense                   1,153 825 (453)
Income/(Loss) from Continuing Operations Before Income Taxes                   793 319 (890)
Income/(Loss) from Continuing Operations                   (3,338) (384) 616
Income/(Loss) from Continuing Operations                   4,131 703 (1,506)
Income/(loss) from discontinued operations, net of income tax                   307 (329) (663)
Net Income/(Loss)                   4,438 374 (2,169)
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests                   0 106 (16)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   $ 4,438 $ 268 $ (2,153)