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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)

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