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Segment Reporting (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 1,992 | $ 2,960 | $ 2,461 | $ 2,065 | $ 2,154 | $ 2,618 | $ 2,281 | $ 2,021 | $ 9,478 | $ 9,074 | $ 8,915
Operating expenses |  |  |  |  |  |  |  |  |  | 7,997 | 7,766 | 7,708
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 421 | 596 | 756
Impairment losses |  |  |  |  |  |  |  |  |  | 99 | 1,534 | 483
Development costs |  |  |  |  |  |  |  |  |  | 11 | 22 | 48
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 8,528 | 9,918 | 8,995
Other income - affiliate | $ 84 |  |  |  |  |  |  |  |  | 0 | 87 | 193
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 32 | 16 | (80)
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  | (80)
Operating income/(loss) |  | 49 | 398 | 174 | 361 | (1,200) | 275 | 214 | (30) | 982 | (741) | 33
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 9 | (14) | (18)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (15) | (79) | (268)
Other income/(expenses), net |  |  |  |  |  |  |  |  |  | 18 | 51 | 47
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (44) | (49) | (142)
Interest expense |  |  |  |  |  |  |  |  |  | (483) | (557) | (583)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 467 | (1,389) | (931)
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  | 7 | (44) | 25
Net Income/(Loss) from Continuing Operations |  | (93) | 288 | 27 | 238 | (1,390) | 163 | 60 | (178) | 460 | (1,345) | (956)
(Loss)/income from discontinued operations, net of income tax |  | 80 | (336) | 69 | (5) | (265) | 0 | (702) | (25) | (192) | (992) | 65
Net Income/(Loss) |  | (13) | (48) | 96 | 233 | (1,655) | 163 | (642) | (203) | 268 | (2,337) | (891)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  | (2) | $ 24 | $ 24 | $ (46) | (120) | $ (8) | $ (16) | $ (40) | 0 | (184) | (117)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 268 | (2,153) | (774)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | 182 | 412 |  |  |  | 182 |  |  |  | 412 | 182 |
Capital expenditures | 250 | 388 |  |  |  | 250 |  |  |  | 388 | 250 |
Goodwill | 539 | 573 |  |  |  | 539 |  |  |  | 573 | 539 |
Total assets | 23,355 | 10,628 |  |  |  | 23,355 |  |  |  | 10,628 | 23,355 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | (1,068) | (923) | (1,122)
Operating expenses |  |  |  |  |  |  |  |  |  | (1,066) | (925) | (1,129)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | (3) | (3)
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Development costs |  |  |  |  |  |  |  |  |  | (1) | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | (1,067) | (928) | (1,132)
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  | 0
Operating income/(loss) |  |  |  |  |  |  |  |  |  | (1) | 5 | 10
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (5) | (5) | 0
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income/(expenses), net |  |  |  |  |  |  |  |  |  | (1) | 0 | (2)
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 2
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (7) | 0 | 10
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | (7) | 0 | 10
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | (7) | 0 | 10
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | (5) | 0 | (12)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | (2) | 0 | 22
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | (92) | 0 |  |  |  | (92) |  |  |  | 0 | (92) |
Capital expenditures | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Goodwill | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets | (5,792) | (5,401) |  |  |  | (5,792) |  |  |  | (5,401) | (5,792) |
Retail | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 7,103 | 6,369 | 6,330
Operating expenses |  |  |  |  |  |  |  |  |  | 5,919 | 5,377 | 5,162
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 116 | 110 | 114
Impairment losses |  |  |  |  |  |  |  |  |  | 1 | 8 | 1
Development costs |  |  |  |  |  |  |  |  |  | 1 | 3 | 4
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 6,037 | 5,498 | 5,281
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  | (1)
Operating income/(loss) |  |  |  |  |  |  |  |  |  | 1,066 | 871 | 1,048
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income/(expenses), net |  |  |  |  |  |  |  |  |  | 0 | 0 | (6)
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (3) | (6) | 6
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 1,063 | 865 | 1,048
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  | 1 | (8) | 1
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 1,062 | 873 | 1,047
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 1,062 | 873 | 1,047
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 1 | 1 | 0
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 1,061 | 872 | 1,047
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Capital expenditures | 82 | 90 |  |  |  | 82 |  |  |  | 90 | 82 |
Goodwill | 374 | 408 |  |  |  | 374 |  |  |  | 408 | 374 |
Total assets | 2,655 | 3,291 |  |  |  | 2,655 |  |  |  | 3,291 | 2,655 |
Retail | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | (9) | (4) | (16)
Generation | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 3,432 | 3,615 | 3,633
Operating expenses |  |  |  |  |  |  |  |  |  | 3,019 | 3,071 | 3,322
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 272 | 454 | 593
Impairment losses |  |  |  |  |  |  |  |  |  | 98 | 1,526 | 452
Development costs |  |  |  |  |  |  |  |  |  | 9 | 13 | 15
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 3,398 | 5,064 | 4,382
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 2 | 15 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  | 0
Operating income/(loss) |  |  |  |  |  |  |  |  |  | 36 | (1,434) | (749)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 10 | (14) | (63)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (15) | (75) | (248)
Other income/(expenses), net |  |  |  |  |  |  |  |  |  | 20 | 23 | 22
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (58) | (100) | (96)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (7) | (1,600) | (1,134)
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  | 0 | 2 | (1)
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | (7) | (1,602) | (1,133)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | (7) | (1,602) | (1,133)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 9 | 4 | (1)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | (16) | (1,606) | (1,132)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | 179 | 412 |  |  |  | 179 |  |  |  | 412 | 179 |
Capital expenditures | 148 | 267 |  |  |  | 148 |  |  |  | 267 | 148 |
Goodwill | 165 | 165 |  |  |  | 165 |  |  |  | 165 | 165 |
Total assets | 9,090 | 5,735 |  |  |  | 9,090 |  |  |  | 5,735 | 9,090 |
Generation | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | (1,085) | (877) | (999)
Corporate | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 11 | 13 | 74
Operating expenses |  |  |  |  |  |  |  |  |  | 125 | 243 | 353
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 33 | 35 | 52
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 30
Development costs |  |  |  |  |  |  |  |  |  | 2 | 6 | 29
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 160 | 284 | 464
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 87 | 193
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 30 | 1 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  | (79)
Operating income/(loss) |  |  |  |  |  |  |  |  |  | (119) | (183) | (276)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 4 | 5 | 45
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | (4) | (20)
Other income/(expenses), net |  |  |  |  |  |  |  |  |  | (1) | 28 | 33
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | (44) | (49) | (142)
Interest expense |  |  |  |  |  |  |  |  |  | (422) | (451) | (495)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (582) | (654) | (855)
Income tax expense/(benefit) |  |  |  |  |  |  |  |  |  | 6 | (38) | 25
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | (588) | (616) | (880)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | (192) | (992) | 65
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | (780) | (1,608) | (815)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | (5) | (189) | (104)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | (775) | (1,419) | (711)
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | 95 | 0 |  |  |  | 95 |  |  |  | 0 | 95 |
Capital expenditures | 20 | 31 |  |  |  | 20 |  |  |  | 31 | 20 |
Goodwill | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Total assets | $ 17,402 | $ 7,003 |  |  |  | $ 17,402 |  |  |  | 7,003 | 17,402 |
Corporate | Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | $ 26 | $ (42) | $ (107)
Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00%
Customer Concentration Risk | Generation |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 11.00% |  |

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