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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 income/(loss) |  | 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 |  |  |  |  |  |  |  |  |  | (1,706) | (1,068) | (923)
Operating expenses |  |  |  |  |  |  |  |  |  | (1,705) | (1,069) | (925)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 0 | (3)
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Development costs |  |  |  |  |  |  |  |  |  | 0 | (1) | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | (1,705) | (1,070) | (928)
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income/(loss) |  |  |  |  |  |  |  |  |  | (1) | 2 | 5
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | (5) | (5)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  | 0 | (1) | 0
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (1) | (4) | 0
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | (1) | (4) | 0
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | (1) | (4) | 0
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | (5) | 0
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | (1) | 1 | 0
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Goodwill |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets |  | (5,040) |  |  |  | (5,404) |  |  |  | (5,040) | (5,404) |
Retail | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,680 | 7,103 | 6,369
Operating expenses |  |  |  |  |  |  |  |  |  | 7,031 | 5,919 | 5,377
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 157 | 116 | 110
Impairment losses |  |  |  |  |  |  |  |  |  | 1 | 1 | 8
Development costs |  |  |  |  |  |  |  |  |  | 0 | 1 | 3
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 7,189 | 6,037 | 5,498
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | (1) | 0 | 0
Operating income/(loss) |  |  |  |  |  |  |  |  |  | 490 | 1,066 | 871
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  | 2 | 0 | 0
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (3) | (3) | (6)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 489 | 1,063 | 865
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 2 | 1 | (8)
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 487 | 1,062 | 873
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 487 | 1,062 | 873
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 3 | 1 | 1
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 484 | 1,061 | 872
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 60 |  |  |  | 90 |  |  |  | 60 | 90 |
Goodwill |  | 414 |  |  |  | 408 |  |  |  | 414 | 408 |
Total assets |  | 3,573 |  |  |  | 3,291 |  |  |  | 3,573 | 3,291 |
Retail | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (10) | (9) | (4)
Generation | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,847 | 3,443 | 3,615
Operating expenses |  |  |  |  |  |  |  |  |  | 2,777 | 3,021 | 3,071
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 185 | 272 | 454
Impairment losses |  |  |  |  |  |  |  |  |  | 4 | 98 | 1,526
Development costs |  |  |  |  |  |  |  |  |  | 7 | 9 | 13
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 2,973 | 3,400 | 5,064
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 0
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 2 | 2 | 15
Operating income/(loss) |  |  |  |  |  |  |  |  |  | 876 | 45 | (1,434)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 2 | 10 | (14)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (101) | (15) | (75)
Other income, net |  |  |  |  |  |  |  |  |  | 32 | 20 | 23
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (3) | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (24) | (58) | (100)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 782 | 2 | (1,600)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 2 | 0 | 2
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 780 | 2 | (1,602)
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 780 | 2 | (1,602)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 9 | 4
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 780 | (7) | (1,606)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 388 |  |  |  | 412 |  |  |  | 388 | 412 |
Capital expenditures |  | 134 |  |  |  | 267 |  |  |  | 134 | 267 |
Goodwill |  | 165 |  |  |  | 165 |  |  |  | 165 | 165 |
Total assets |  | 5,467 |  |  |  | 5,735 |  |  |  | 5,467 | 5,735 |
Generation | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (1,602) | (1,085) | (877)
Corporate | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 13
Operating expenses |  |  |  |  |  |  |  |  |  | 50 | 126 | 243
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 31 | 33 | 35
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Development costs |  |  |  |  |  |  |  |  |  | 0 | 2 | 6
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 81 | 161 | 284
Other income - affiliate |  |  |  |  |  |  |  |  |  |  |  | 87
(Loss)/Gain on sale of assets |  |  |  |  |  |  |  |  |  | 6 | 30 | 1
Operating income/(loss) |  |  |  |  |  |  |  |  |  | (75) | (131) | (183)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 4 | 5
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (7) | 0 | (4)
Other income, net |  |  |  |  |  |  |  |  |  | 32 | (1) | 28
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (48) | (44) | (49)
Interest expense |  |  |  |  |  |  |  |  |  | (386) | (422) | (451)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (484) | (594) | (654)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | (3,338) | 6 | (38)
Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 2,854 | (600) | (616)
Income/(loss) from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 321 | (192) | (992)
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 3,175 | (792) | (1,608)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | (5) | (189)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 3,175 | (787) | (1,419)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures |  | 34 |  |  |  | 31 |  |  |  | 34 | 31 |
Goodwill |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets |  | $ 8,531 |  |  |  | $ 7,006 |  |  |  | 8,531 | 7,006 |
Corporate | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (94) | $ 26 | $ (42)
Customer Concentration Risk | Generation |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  | 10.00% | 11.00% |

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