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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  | $ 2,497 | $ 3,049 | $ 2,701 | $ 2,382 | $ 2,184 | $ 3,421 | $ 2,248 | $ 2,659 |  | $ 10,629 | $ 10,512 | $ 12,328
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  |  | 7,536 | 7,301 | 9,000
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 1,056 | 1,172 | 1,351
Impairment losses |  |  |  |  |  |  |  |  |  |  | 1,709 | 702 | 4,860
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | 907 | 1,095 | 1,228
Reorganization costs |  |  |  |  |  |  |  |  |  |  | 44 |  |
Development costs |  |  |  |  |  |  |  |  |  |  | 67 | 89 | 154
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  | 11,319 | 10,359 | 16,593
Other income - affiliate | $ 84 |  |  |  |  |  |  |  |  |  | 87 | 193 | 193
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 16 | (80) | 0
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 21
Operating (Loss)/Income |  | (1,345) | 376 | 343 | 39 | (658) | 429 | 164 | 331 |  | (587) | 266 | (4,051)
Other (Expense)/Income |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses)/earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in (losses)/earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | 31 | 27 | 36
Impairment losses on investments |  |  |  |  |  |  |  |  |  | $ (56) | (79) | (268) | (56)
Other income, net |  |  |  |  |  |  |  |  |  |  | 38 | 34 | 26
Loss on sale of equity method investment |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (14)
Net (loss)/gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (53) | (142) | 10
Interest expense |  |  |  |  |  |  |  |  |  |  | (890) | (895) | (937)
Total other expense |  |  |  |  |  |  |  |  |  |  | (953) | (1,244) | (935)
Loss from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  |  | (1,540) | (978) | (4,986)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  | 8 | 5 | 1,345
Net Loss from Continuing Operations |  | (1,667) | 190 | 99 | (170) | (891) | 128 | (163) | (57) |  | (1,548) | (983) | (6,331)
(Loss)/income from discontinued operations, net of income tax |  | 13 | (27) | (741) | (34) | (164) | 265 | (113) | 104 |  | (789) | 92 | (105)
Net Loss |  | (1,655) | 163 | (642) | (203) | (1,055) | 393 | (276) | 47 |  | (2,337) | (891) | (6,436)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  | (120) | (8) | (16) | (40) | (68) | (9) | (5) | (35) |  | (184) | (117) | (54)
Net Loss Attributable to NRG Energy, Inc. |  | $ (1,535) | $ 171 | $ (626) | $ (163) | $ (987) | $ 402 | $ (271) | $ 82 |  | (2,153) | (774) | (6,382)
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | (252) | (219) | (94)
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  |  | (249) | (223) | (94)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment losses |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | (3) | 0 | 0
Reorganization costs |  |  |  |  |  |  |  |  |  |  | 0 |  |
Development costs |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  | (252) | (223) | (94)
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Operating (Loss)/Income |  |  |  |  |  |  |  |  |  |  | 0 | 4 | 0
Other (Expense)/Income |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses)/earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,249 | (132) | 2,910
Equity in (losses)/earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | (60) | (10) | (9)
Impairment losses on investments |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  |  | 0 | (2) | 0
Loss on sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Net (loss)/gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other expense |  |  |  |  |  |  |  |  |  |  | 1,189 | (144) | 2,901
Loss from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  |  | 1,189 | (140) | 2,901
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  | 0 | 62 | 53
Net Loss from Continuing Operations |  |  |  |  |  |  |  |  |  |  | 1,189 | (202) | 2,848
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Loss |  |  |  |  |  |  |  |  |  |  | 1,189 | (202) | 2,848
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (60) | (70) | (62)
Net Loss Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  |  | 1,249 | (132) | 2,910
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 7,182 | 7,509 | 9,881
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  |  | 5,373 | 5,402 | 7,610
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 405 | 565 | 751
Impairment losses |  |  |  |  |  |  |  |  |  |  | 1,463 | 378 | 4,494
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | 371 | 415 | 468
Reorganization costs |  |  |  |  |  |  |  |  |  |  | 6 |  |
Development costs |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  | 7,618 | 6,760 | 13,323
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 4 | (1) |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Operating (Loss)/Income |  |  |  |  |  |  |  |  |  |  | (432) | 748 | (3,442)
Other (Expense)/Income |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses)/earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  | (1,162) | (176) | (109)
Equity in (losses)/earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | 0 | 5 | 8
Impairment losses on investments |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  |  | 9 | 4 | 4
Loss on sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Net (loss)/gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  | (14) | (15) | (14)
Total other expense |  |  |  |  |  |  |  |  |  |  | (1,167) | (182) | (111)
Loss from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  |  | (1,599) | 566 | (3,553)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  | (598) | (1) | (1,104)
Net Loss from Continuing Operations |  |  |  |  |  |  |  |  |  |  | (1,001) | 567 | (2,449)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Loss |  |  |  |  |  |  |  |  |  |  | (1,001) | 567 | (2,449)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Loss Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  |  | (1,001) | 567 | (2,449)
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 3,699 | 3,222 | 2,541
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  |  | 2,353 | 2,080 | 1,470
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 619 | 581 | 580
Impairment losses |  |  |  |  |  |  |  |  |  |  | 246 | 324 | 366
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | 146 | 192 | 204
Reorganization costs |  |  |  |  |  |  |  |  |  |  | 0 |  |
Development costs |  |  |  |  |  |  |  |  |  |  | 49 | 59 | 61
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  | 3,413 | 3,236 | 2,681
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 12 | 0 |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  |  | 21
Operating (Loss)/Income |  |  |  |  |  |  |  |  |  |  | 298 | (14) | (119)
Other (Expense)/Income |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses)/earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  | (113) | (5) | (1)
Equity in (losses)/earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | 95 | 36 | 37
Impairment losses on investments |  |  |  |  |  |  |  |  |  |  | (75) | (252) | (25)
Other income, net |  |  |  |  |  |  |  |  |  |  | 17 | 23 | 21
Loss on sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Net (loss)/gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (4) | (4) | (9)
Interest expense |  |  |  |  |  |  |  |  |  |  | (424) | (396) | (366)
Total other expense |  |  |  |  |  |  |  |  |  |  | (504) | (598) | (343)
Loss from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  |  | (206) | (612) | (462)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  | (10) | 7 | (93)
Net Loss from Continuing Operations |  |  |  |  |  |  |  |  |  |  | (196) | (619) | (369)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  |  | (160) | 81 | (115)
Net Loss |  |  |  |  |  |  |  |  |  |  | (356) | (538) | (484)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (108) | (103) | (23)
Net Loss Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  |  | (248) | (435) | (461)
NRG Energy, Inc. (Note Issuer) |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  |  | 59 | 42 | 14
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 32 | 26 | 20
Impairment losses |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | 393 | 488 | 556
Reorganization costs |  |  |  |  |  |  |  |  |  |  | 38 |  |
Development costs |  |  |  |  |  |  |  |  |  |  | 18 | 30 | 93
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  | 540 | 586 | 683
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 87 | 193 | 193
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 0 | (79) |
Gain on postretirement benefits curtailment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Operating (Loss)/Income |  |  |  |  |  |  |  |  |  |  | (453) | (472) | (490)
Other (Expense)/Income |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses)/earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  | 26 | 313 | (2,800)
Equity in (losses)/earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | (4) | (4) | 0
Impairment losses on investments |  |  |  |  |  |  |  |  |  |  | (4) | (16) | (31)
Other income, net |  |  |  |  |  |  |  |  |  |  | 12 | 9 | 1
Loss on sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | (14)
Net (loss)/gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (49) | (138) | 19
Interest expense |  |  |  |  |  |  |  |  |  |  | (452) | (484) | (557)
Total other expense |  |  |  |  |  |  |  |  |  |  | (471) | (320) | (3,382)
Loss from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  |  | (924) | (792) | (3,872)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  |  | 616 | (63) | 2,489
Net Loss from Continuing Operations |  |  |  |  |  |  |  |  |  |  | (1,540) | (729) | (6,361)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  |  | (629) | 11 | 10
Net Loss |  |  |  |  |  |  |  |  |  |  | (2,169) | (718) | (6,351)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (16) | 56 | 31
Net Loss Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  |  | $ (2,153) | $ (774) | $ (6,382)

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