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Condensed Consolidating Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating Revenues |  |  |  |
Total operating revenues | $ 2,922 | $ 2,701 | $ 5,343 | $ 5,083
Operating Costs and Expenses |  |  |  |
Cost of operations | 2,051 | 1,841 | 3,609 | 3,704
Depreciation and amortization | 227 | 260 | 462 | 517
Impairment losses | 74 | 63 | 74 | 63
Selling, general and administrative | 211 | 221 | 402 | 481
Reorganization costs | 23 | 0 | 43 | 0
Development costs | 16 | 18 | 29 | 35
Total operating costs and expenses | 2,602 | 2,403 | 4,619 | 4,800
Other income - affiliate | 0 | 39 | 0 | 87
Gain on sale of assets | 14 | 2 | 16 | 4
Operating Income/(Loss) | 334 | 339 | 740 | 374
Other Income/(Expense) |  |  |  |
Equity in earnings of consolidated subsidiaries | 0 | 0 | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates | 18 | (3) | 16 | 2
Other income/(expense), net | (20) | 14 | (23) | 26
Loss on debt extinguishment, net | (1) | 0 | (3) | (2)
Interest expense | (202) | (247) | (369) | (471)
Total other expense | (205) | (236) | (379) | (445)
Income/(Loss) from Continuing Operations Before Income Taxes | 129 | 103 | 361 | (71)
Income tax expense/(benefit) | 8 | 4 | 7 | (1)
Income/(Loss) from Continuing Operations | 121 | 99 | 354 | (70)
Loss from discontinued operations, net of income tax | (25) | (741) | (25) | (775)
Net Income/(Loss) | 96 | (642) | 329 | (845)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests | 24 | (16) | (22) | (55)
Net Income Attributable to NRG Energy, Inc. | 72 | (626) | 351 | (790)
Eliminations |  |  |  |
Operating Revenues |  |  |  |
Total operating revenues | (13) | (23) | (26) | (36)
Operating Costs and Expenses |  |  |  |
Cost of operations | (5) | (21) | (17) | (36)
Depreciation and amortization | 0 | 0 | 0 | 0
Impairment losses | 0 | 0 | 0 | 0
Selling, general and administrative | (10) | (1) | (10) | (1)
Reorganization costs | 0 |  | 0 |
Development costs | 0 | 0 | (1) | 0
Total operating costs and expenses | (15) | (22) | (28) | (37)
Other income - affiliate |  | 0 |  | 0
Gain on sale of assets | 0 | 0 | 0 | 0
Operating Income/(Loss) | 2 | (1) | 2 | 1
Other Income/(Expense) |  |  |  |
Equity in earnings of consolidated subsidiaries | (362) | 141 | (694) | 87
Equity in earnings/(losses) of unconsolidated affiliates | 0 | 0 | 0 | 0
Other income/(expense), net | 0 | (34) | 0 | (35)
Loss on debt extinguishment, net | 0 |  | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Total other expense | (362) | 107 | (694) | 52
Income/(Loss) from Continuing Operations Before Income Taxes | (360) | 106 | (692) | 53
Income tax expense/(benefit) | 0 | 0 | 0 | 0
Income/(Loss) from Continuing Operations | (360) | 106 | (692) | 53
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0
Net Income/(Loss) | (360) | 106 | (692) | 53
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests | 2 | (35) | 2 | (34)
Net Income Attributable to NRG Energy, Inc. | (362) | 141 | (694) | 87
Guarantor Subsidiaries |  |  |  |
Operating Revenues |  |  |  |
Total operating revenues | 2,276 | 2,060 | 4,120 | 3,878
Operating Costs and Expenses |  |  |  |
Cost of operations | 1,778 | 1,530 | 3,004 | 3,050
Depreciation and amortization | 76 | 99 | 149 | 198
Impairment losses | 0 | 42 | 0 | 42
Selling, general and administrative | 110 | 96 | 213 | 205
Reorganization costs | 1 |  | 3 |
Development costs | 0 | 0 | 0 | 0
Total operating costs and expenses | 1,965 | 1,767 | 3,369 | 3,495
Other income - affiliate |  | 0 |  | 0
Gain on sale of assets | 0 | 2 | 3 | 4
Operating Income/(Loss) | 311 | 295 | 754 | 387
Other Income/(Expense) |  |  |  |
Equity in earnings of consolidated subsidiaries | 7 | 8 | 9 | 13
Equity in earnings/(losses) of unconsolidated affiliates | 0 | 0 | 0 | 0
Other income/(expense), net | 4 | 0 | 8 | 1
Loss on debt extinguishment, net | 0 |  | 0 | 0
Interest expense | (4) | (4) | (7) | (7)
Total other expense | 7 | 4 | 10 | 7
Income/(Loss) from Continuing Operations Before Income Taxes | 318 | 299 | 764 | 394
Income tax expense/(benefit) | 108 | 113 | 221 | 131
Income/(Loss) from Continuing Operations | 210 | 186 | 543 | 263
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0
Net Income/(Loss) | 210 | 186 | 543 | 263
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests | 0 | 0 | 0 | 0
Net Income Attributable to NRG Energy, Inc. | 210 | 186 | 543 | 263
Non-Guarantor Subsidiaries |  |  |  |
Operating Revenues |  |  |  |
Total operating revenues | 659 | 664 | 1,249 | 1,241
Operating Costs and Expenses |  |  |  |
Cost of operations | 282 | 312 | 613 | 651
Depreciation and amortization | 143 | 153 | 297 | 303
Impairment losses | 74 | 21 | 74 | 21
Selling, general and administrative | 34 | 29 | 60 | 64
Reorganization costs | 0 |  | 0 |
Development costs | 13 | 13 | 23 | 25
Total operating costs and expenses | 546 | 528 | 1,067 | 1,064
Other income - affiliate |  | 0 |  | 0
Gain on sale of assets | 14 | 0 | 13 | 0
Operating Income/(Loss) | 127 | 136 | 195 | 177
Other Income/(Expense) |  |  |  |
Equity in earnings of consolidated subsidiaries | 0 | 0 | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates | 18 | (2) | 17 | 4
Other income/(expense), net | (26) | 41 | (36) | 47
Loss on debt extinguishment, net | 0 |  | 0 | (2)
Interest expense | (92) | (121) | (164) | (225)
Total other expense | (100) | (82) | (183) | (176)
Income/(Loss) from Continuing Operations Before Income Taxes | 27 | 54 | 12 | 1
Income tax expense/(benefit) | (68) | 267 | (20) | 237
Income/(Loss) from Continuing Operations | 95 | (213) | 32 | (236)
Loss from discontinued operations, net of income tax | 0 | (123) | 0 | (160)
Net Income/(Loss) | 95 | (336) | 32 | (396)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests | (57) | (9) | (119) | (46)
Net Income Attributable to NRG Energy, Inc. | 152 | (327) | 151 | (350)
NRG Energy, Inc. (Note Issuer) |  |  |  |
Operating Revenues |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0
Operating Costs and Expenses |  |  |  |
Cost of operations | (4) | 20 | 9 | 39
Depreciation and amortization | 8 | 8 | 16 | 16
Impairment losses | 0 | 0 | 0 | 0
Selling, general and administrative | 77 | 97 | 139 | 213
Reorganization costs | 22 |  | 40 |
Development costs | 3 | 5 | 7 | 10
Total operating costs and expenses | 106 | 130 | 211 | 278
Other income - affiliate |  | 39 |  | 87
Gain on sale of assets | 0 | 0 | 0 | 0
Operating Income/(Loss) | (106) | (91) | (211) | (191)
Other Income/(Expense) |  |  |  |
Equity in earnings of consolidated subsidiaries | 355 | (149) | 685 | (100)
Equity in earnings/(losses) of unconsolidated affiliates | 0 | (1) | (1) | (2)
Other income/(expense), net | 2 | 7 | 5 | 13
Loss on debt extinguishment, net | (1) |  | (3) | 0
Interest expense | (106) | (122) | (198) | (239)
Total other expense | 250 | (265) | 488 | (328)
Income/(Loss) from Continuing Operations Before Income Taxes | 144 | (356) | 277 | (519)
Income tax expense/(benefit) | (32) | (376) | (194) | (369)
Income/(Loss) from Continuing Operations | 176 | 20 | 471 | (150)
Loss from discontinued operations, net of income tax | (25) | (618) | (25) | (615)
Net Income/(Loss) | 151 | (598) | 446 | (765)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests | 79 | 28 | 95 | 25
Net Income Attributable to NRG Energy, Inc. | $ 72 | $ (626) | $ 351 | $ (790)

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