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Segment Reporting (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
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 2,195 | $ 2,996 | $ 2,465 | $ 2,165 | $ 1,992 | $ 2,960 | $ 2,461 | $ 2,065 | $ 9,821 | $ 9,478 | $ 9,074
Operating expenses |  |  |  |  |  |  |  |  |  | 8,153 | 7,997 | 7,766
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 373 | 421 | 596
Impairment losses |  |  |  |  |  |  |  |  |  | 5 | 99 | 1,534
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 (loss)/income |  | 209 | 540 | 320 | 221 | 49 | 398 | 174 | 361 | 1,290 | 982 | (741)
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 |  |  |  |  |  |  |  |  |  | (51) | (44) | (49)
Interest expense |  |  |  |  |  |  |  |  |  | (413) | (483) | (557)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 786 | 467 | (1,389)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | (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 attributable to noncontrolling interests and redeemable noncontrolling 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)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 388 |  |  |  | 412 |  |  |  | 388 | 412 |
Capital expenditures |  | 228 |  |  |  | 388 |  |  |  | 228 | 388 |
Goodwill |  | 579 |  |  |  | 573 |  |  |  | 579 | 573 |
Total assets |  | 12,531 |  |  |  | 10,628 |  |  |  | 12,531 | 10,628 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (7) | (18) | (47)
Operating expenses |  |  |  |  |  |  |  |  |  | (7) | (18) | (48)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 0 | (3)
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Development costs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | (7) | (18) | (51)
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating (loss)/income |  |  |  |  |  |  |  |  |  | 0 | 0 | 4
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 |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 0 | 0 | 4
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 0 | 0 | 4
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 4
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 4
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Goodwill |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets |  | (4,872) |  |  |  | (5,095) |  |  |  | (4,872) | (5,095) |
Texas | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,069 | 6,401 | 6,318
Operating expenses |  |  |  |  |  |  |  |  |  | 5,818 | 5,399 | 5,393
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 188 | 156 | 258
Impairment losses |  |  |  |  |  |  |  |  |  | 1 | 5 | 1,317
Development costs |  |  |  |  |  |  |  |  |  | 3 | 3 | 4
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 6,010 | 5,563 | 6,972
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 4 | 5
Operating (loss)/income |  |  |  |  |  |  |  |  |  | 1,059 | 842 | (649)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (4) | (3) | (22)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (103) | (15) | (69)
Other income, net |  |  |  |  |  |  |  |  |  | 20 | 13 | (2)
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 972 | 837 | (742)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 972 | 837 | (742)
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 972 | 837 | (742)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 972 | 837 | (742)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 6 |  |  |  | 6 |  |  |  | 6 | 6 |
Capital expenditures |  | 136 |  |  |  | 143 |  |  |  | 136 | 143 |
Goodwill |  | 325 |  |  |  | 320 |  |  |  | 325 | 320 |
Total assets |  | 5,711 |  |  |  | 5,357 |  |  |  | 5,711 | 5,357 |
Texas | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (1) | (19) | (41)
East | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,319 | 2,371 | 2,009
Operating expenses |  |  |  |  |  |  |  |  |  | 1,895 | 2,024 | 1,684
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 121 | 105 | 112
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 82 | 106
Development costs |  |  |  |  |  |  |  |  |  | 3 | 3 | 6
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 2,019 | 2,214 | 1,908
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 1 | 0 | 15
Operating (loss)/income |  |  |  |  |  |  |  |  |  | 301 | 157 | 116
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  | 6 | 2 | 4
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (18) | (22) | (29)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 289 | 137 | 91
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 2 | 1 | 0
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 287 | 136 | 91
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 287 | 136 | 91
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 287 | 136 | 91
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 30 |  |  |  | 171 |  |  |  | 30 | 171 |
Goodwill |  | 254 |  |  |  | 253 |  |  |  | 254 | 253 |
Total assets |  | 2,160 |  |  |  | 2,187 |  |  |  | 2,160 | 2,187 |
East | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (8) | 5 | (1)
West/Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 440 | 724 | 788
Operating expenses |  |  |  |  |  |  |  |  |  | 397 | 467 | 498
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 33 | 127 | 194
Impairment losses |  |  |  |  |  |  |  |  |  | 4 | 12 | 111
Development costs |  |  |  |  |  |  |  |  |  | 1 | 3 | 6
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 435 | 609 | 809
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | (2) | (5)
Operating (loss)/income |  |  |  |  |  |  |  |  |  | 5 | 113 | (26)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 6 | 13 | 10
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | (6)
Other income, net |  |  |  |  |  |  |  |  |  | 10 | 4 | 22
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (3) | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (10) | (39) | (77)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 8 | 91 | (77)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 1 | 0 | (6)
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 7 | 91 | (71)
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 7 | 91 | (71)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 3 | 5 | 1
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 4 | 86 | (72)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 382 |  |  |  | 406 |  |  |  | 382 | 406 |
Capital expenditures |  | 25 |  |  |  | 29 |  |  |  | 25 | 29 |
Goodwill |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets |  | 1,190 |  |  |  | 1,548 |  |  |  | 1,190 | 1,548 |
West/Other | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2 | (4) | 4
Corporate | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 6
Operating expenses |  |  |  |  |  |  |  |  |  | 50 | 125 | 239
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 31 | 33 | 35
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Development costs |  |  |  |  |  |  |  |  |  | 0 | 2 | 6
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 81 | 160 | 280
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 87
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 6 | 30 | 1
Operating (loss)/income |  |  |  |  |  |  |  |  |  | (75) | (130) | (186)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | (1) | (2)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (5) | 0 | (4)
Other income, net |  |  |  |  |  |  |  |  |  | 30 | (1) | 27
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (48) | (44) | (49)
Interest expense |  |  |  |  |  |  |  |  |  | (385) | (422) | (451)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (483) | (598) | (665)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | (3,337) | 6 | (38)
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 2,854 | (604) | (627)
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 321 | (192) | (992)
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 3,175 | (796) | (1,619)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | (5) | (189)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 3,175 | (791) | (1,430)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 37 |  |  |  | 45 |  |  |  | 37 | 45 |
Goodwill |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets |  | $ 8,342 |  |  |  | $ 6,631 |  |  |  | 8,342 | 6,631 |
Corporate | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (9)
Customer Concentration Risk | Texas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  | 10.00% | 11.00% |

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