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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Reporting Information |
| For the Year Ended December 31, 2017
| Generation(a) |  | Retail (a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 3,773 |  |  | $ | 6,380 |  |  | $ | 424 |  |  | $ | 1,009 |  |  | $ | 14 |  |  | $ | (971 | ) |  |  | $ | 10,629 |
Operating expenses | 3,300 |  |  | 5,372 |  |  | 211 |  |  | 348 |  |  | 220 |  |  | (964 | ) |  |  | 8,487 |
Depreciation and amortization | 377 |  |  | 117 |  |  | 196 |  |  | 334 |  |  | 32 |  |  | — |  |  |  | 1,056 |
Impairment losses | 1,504 |  |  | 7 |  |  | 154 |  |  | 44 |  |  | — |  |  | — |  |  |  | 1,709 |
Development costs | 13 |  |  | 2 |  |  | 45 |  |  | — |  |  | 7 |  |  | — |  |  |  | 67 |
Total operating cost and expenses | 5,194 |  |  | 5,498 |  |  | 606 |  |  | 726 |  |  | 259 |  |  | (964 | ) |  |  | 11,319 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 87 |  |  | — |  |  |  | 87 |
Gain/(loss) on sale of assets | 20 |  |  | — |  |  | (5 | ) |  | — |  |  | 1 |  |  | — |  |  |  | 16 |
Operating (loss)/income | (1,401 | ) |  | 882 |  |  | (187 | ) |  | 283 |  |  | (157 | ) |  | (7 | ) |  |  | (587 | )
Equity in (losses)/earnings of unconsolidated affiliates | (14 | ) |  | — |  |  | — |  |  | 71 |  |  | 6 |  |  | (32 | ) |  |  | 31 |
Impairment losses on investments | (74 | ) |  | — |  |  | — |  |  | — |  |  | (5 | ) |  | — |  |  |  | (79 | )
Other income, net | 22 |  |  | 1 |  |  | — |  |  | 4 |  |  | 11 |  |  | — |  |  |  | 38 |
Loss on debt extinguishment | — |  |  | — |  |  | (1 | ) |  | (3 | ) |  | (49 | ) |  | — |  |  |  | (53 | )
Interest expense | (29 | ) |  | (6 | ) |  | (98 | ) |  | (306 | ) |  | (451 | ) |  | — |  |  |  | (890 | )
(Loss)/income from continuing operations before income taxes | (1,496 | ) |  | 877 |  |  | (286 | ) |  | 49 |  |  | (645 | ) |  | (39 | ) |  |  | (1,540 | )
Income tax expense/(benefit) | 2 |  |  | (9 | ) |  | (20 | ) |  | 72 |  |  | (37 | ) |  | — |  |  |  | 8 |
Net (loss)/income from continuing operations | $ | (1,498 | ) |  | $ | 886 |  |  | $ | (266 | ) |  | $ | (23 | ) |  | $ | (608 | ) |  | $ | (39 | ) |  |  | $ | (1,548 | )
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | (789 | ) |  | — |  |  |  | $ | (789 | )
Net (Loss)/Income | (1,498 | ) |  | 886 |  |  | (266 | ) |  | (23 | ) |  | (1,397 | ) |  | (39 | ) |  |  | (2,337 | )
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | 2 |  |  | (103 | ) |  | (87 | ) |  | (4 | ) |  | 8 |  |  |  | (184 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (1,498 | ) |  | $ | 884 |  |  | $ | (163 | ) |  | $ | 64 |  |  | $ | (1,393 | ) |  | $ | (47 | ) |  |  | $ | (2,153 | )
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | 179 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 852 |  |  | $ | 3 |  |  | $ | — |  |  |  | $ | 1,038 |
Capital expenditures (b) | 481 |  |  | 82 |  |  | 521 |  |  | 31 |  |  | 12 |  |  | — |  |  | 1,127 |
Goodwill | 165 |  |  | 374 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 539 |
Total assets | $ | 7,209 |  |  | $ | 2,630 |  |  | $ | 5,129 |  |  | $ | 8,283 |  |  | $ | 8,919 |  |  | $ | (8,852 | ) | — |  | $ | 23,318 |
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 910 |  |  | $ | 5 |  |  | $ | 31 |  |  | $ | — |  |  | $ | 25 |  |  | $ | — |  |  | $ | 971 |
(b) Includes accruals.
| For the Year Ended December 31, 2016
| Generation(a) |  | Retail (a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 3,833 |  |  | $ | 6,335 |  |  | $ | 406 |  |  | $ | 1,035 |  |  | $ | 77 |  |  | $ | (1,174 | ) |  | $ | 10,512 |
Operating expenses | 3,545 |  |  | 5,164 |  |  | 217 |  |  | 325 |  |  | 323 |  |  | (1,178 | ) |  | 8,396 |
Depreciation and amortization | 516 |  |  | 111 |  |  | 185 |  |  | 303 |  |  | 57 |  |  | — |  |  | 1,172 |
Impairment losses | 430 |  |  | 1 |  |  | 54 |  |  | 185 |  |  | 32 |  |  | — |  |  | 702 |
Development costs | 15 |  |  | 4 |  |  | 40 |  |  | — |  |  | 30 |  |  | — |  |  | 89 |
Total operating cost and expenses | 4,506 |  |  | 5,280 |  |  | 496 |  |  | 813 |  |  | 442 |  |  | (1,178 | ) |  | 10,359 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 193 |  |  | — |  |  | 193 |
Loss on sale of assets | — |  |  | (1 | ) |  | — |  |  | — |  |  | (79 | ) |  |  |  |  | (80 | )
Operating (loss)/income | (673 | ) |  | 1,054 |  |  | (90 | ) |  | 222 |  |  | (251 | ) |  | 4 |  |  | 266 |
Equity in (losses)/earnings of unconsolidated affiliates | (5 | ) |  | — |  |  | (58 | ) |  | 60 |  |  | 13 |  |  | 17 |  |  | 27 |
Impairment losses on investments | (142 | ) |  | — |  |  | (105 | ) |  | — |  |  | (21 | ) |  | — |  |  | (268 | )
Other income, net | 21 |  |  | (6 | ) |  | 1 |  |  | 3 |  |  | 19 |  |  | (4 | ) |  | 34 |
Loss on debt extinguishment | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | — |  |  | (142 | )
Interest expense | (26 | ) |  | 6 |  |  | (98 | ) |  | (284 | ) |  | (495 | ) |  | 2 |  |  | (895 | )
(Loss)/income from continuing operations before income taxes | (825 | ) |  | 1,054 |  |  | (350 | ) |  | 1 |  |  | (877 | ) |  | 19 |  |  | (978 | )
Income tax (benefit)/expense | (1 | ) |  | 1 |  |  | (20 | ) |  | (1 | ) |  | 26 |  |  | — |  |  | 5 |
Net (loss)/income from continuing operations | (824 | ) |  | 1,053 |  |  | (330 | ) |  | 2 |  |  | (903 | ) |  | 19 |  |  | (983 | )
Income from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | 92 |  |  |  |  |  | 92 |
Net (Loss)/Income | (824 | ) |  | 1,053 |  |  | (330 | ) |  | 2 |  |  | (811 | ) |  | 19 |  |  | (891 | )
Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | (2 | ) |  | (13 | ) |  | (54 | ) |  | 18 |  |  | (66 | ) |  | (117 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (824 | ) |  | $ | 1,055 |  |  | $ | (317 | ) |  | $ | 56 |  |  | $ | (829 | ) |  | $ | 85 |  |  | $ | (774 | )
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | 204 |  |  | $ | — |  |  | $ | 26 |  |  | $ | 886 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1,120 |
Capital expenditures(b) | 522 |  |  | 12 |  |  | 330 |  |  | 23 |  |  | 110 |  |  | — |  |  | 997 |
Goodwill | 276 |  |  | 374 |  |  | 12 |  |  | — |  |  | — |  |  | — |  |  | 662 |
Total assets | $ | 13,514 |  |  | $ | 2,332 |  |  | $ | 4,921 |  |  | $ | 8,962 |  |  | $ | 11,891 |  |  | $ | (10,938 | ) |  | $ | 30,682 |
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 1,033 |  |  | $ | 4 |  |  | $ | 24 |  |  | $ | 8 |  |  | $ | 105 |  |  | $ | — |  |  | $ | 1,174 |
(b) Includes accruals.
| For the Year Ended December 31, 2015
| Generation(a) |  | Retail(a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 5,179 |  |  | $ | 6,913 |  |  | $ | 383 |  |  | $ | 968 |  |  | $ | 38 |  |  | $ | (1,153 | ) |  | $ | 12,328 |
Operating expenses | 4,198 |  |  | 6,138 |  |  | 187 |  |  | 338 |  |  | 502 |  |  | (1,135 | ) |  | 10,228 |
Depreciation and amortization | 693 |  |  | 132 |  |  | 176 |  |  | 303 |  |  | 47 |  |  | — |  |  | 1,351 |
Impairment losses | 4,655 |  |  | 36 |  |  | 13 |  |  | 1 |  |  | 133 |  |  | 22 |  |  | 4,860 |
Development costs | 26 |  |  | 4 |  |  | 61 |  |  | — |  |  | 63 |  |  | — |  |  | 154 |
Total operating costs and expenses | 9,572 |  |  | 6,310 |  |  | 437 |  |  | 642 |  |  | 745 |  |  | (1,113 | ) |  | 16,593 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 193 |  |  | — |  |  | 193 |
Gain on postretirement benefits curtailment | 21 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21 |
Operating (loss)/income | (4,372 | ) |  | 603 |  |  | (54 | ) |  | 326 |  |  | (514 | ) |  | (40 | ) |  | (4,051 | )
Equity in earnings/(losses)of unconsolidated affiliates | 10 |  |  | — |  |  | (7 | ) |  | 31 |  |  | — |  |  | 2 |  |  | 36 |
Impairment losses on investments | (14 | ) |  | — |  |  | — |  |  | — |  |  | (42 | ) |  | — |  |  | (56 | )
Other income, net | 18 |  |  | (4 | ) |  | 3 |  |  | 3 |  |  | 13 |  |  | (7 | ) |  | 26 |
Loss on sale of equity method investment | — |  |  | — |  |  | — |  |  | — |  |  | (14 | ) |  | — |  |  | (14 | )
Loss on debt extinguishment | — |  |  | — |  |  | — |  |  | (9 | ) |  | 19 |  |  | — |  |  | 10 |
Interest expense | (25 | ) |  | 2 |  |  | (79 | ) |  | (267 | ) |  | (574 | ) |  | 6 |  |  | (937 | )
(Loss)/income from continuing operations before income taxes | (4,383 | ) |  | 601 |  |  | (137 | ) |  | 84 |  |  | (1,112 | ) |  | (39 | ) |  | (4,986 | )
Income tax expense/(benefit) | — |  |  | 1 |  |  | (18 | ) |  | 12 |  |  | 1,350 |  |  | — |  |  | 1,345 |
Net (loss)/income from continuing operations | $ | (4,383 | ) |  | 600 |  |  | (119 | ) |  | 72 |  |  | (2,462 | ) |  | (39 | ) |  | (6,331 | )
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | (105 | ) |  | — |  |  | (105 | )
Net (Loss)/Income | (4,383 | ) |  | 600 |  |  | (119 | ) |  | 72 |  |  | (2,567 | ) |  | (39 | ) |  | (6,436 | )
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | — |  |  | 6 |  |  | 19 |  |  | (37 | ) |  | (42 | ) |  | (54 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (4,383 | ) |  | $ | 600 |  |  | $ | (125 | ) |  | $ | 53 |  |  | $ | (2,530 | ) |  | $ | 3 |  |  | $ | (6,382 | )
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 896 |  |  | $ | 6 |  |  | $ | 31 |  |  | $ | 29 |  |  | $ | 191 |  |  | $ | — |  |  | $ | 1,153 |

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