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Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF OPERATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Operating Revenues |  |  |  |  |  |
Total operating revenues | $ 2,238 |  | $ 2,465 |  | $ 4,257 | $ 4,630
Operating Costs and Expenses |  |  |  |  |  |
Cost of operations | 1,434 |  | 1,845 |  | 2,891 | 3,496
Depreciation and amortization | 110 |  | 85 |  | 219 | 170
Impairment losses | 0 |  | 1 |  | 0 | 1
Selling, general and administrative costs | 208 |  | 211 |  | 417 | 405
Reorganization costs | 0 |  | 2 |  | 3 | 15
Development costs | 2 |  | 2 |  | 5 | 4
Total operating costs and expenses | 1,754 |  | 2,146 |  | 3,535 | 4,091
Gain on sale of assets | 0 |  | 1 |  | 6 | 2
Operating Income/(Loss) | 484 |  | 320 |  | 728 | 541
Other Income/(Expense) |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries | 0 |  | 0 |  | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates | 12 |  | 0 |  | 1 | (21)
Impairment losses on investments | 0 |  | 0 |  | (18) | 0
Other income, net | 14 |  | 20 |  | 41 | 32
Loss on debt extinguishment, net | 0 |  | (47) |  | (1) | (47)
Interest expense | (96) |  | (105) |  | (193) | (219)
Total other income/(expense) | (70) |  | (132) |  | (170) | (255)
Income from Continuing Operations Before Income Taxes | 414 |  | 188 |  | 558 | 286
Income tax expense/(benefit) | 101 |  | (1) |  | 124 | 3
Income from Continuing Operations | 313 |  | 189 |  | 434 | 283
Income from discontinued operations, net of income tax | 0 |  | 13 |  | 0 | 401
Net Income | 313 |  | 202 |  | 434 | 684
Less: Net income attributable to redeemable noncontrolling interests | 0 |  | 1 |  | 0 | 1
Net Income Attributable to NRG Energy, Inc. | 313 | $ 121 | 201 | $ 482 | 434 | 683
Eliminations |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |
Total operating revenues | 2 |  | (7) |  | (9) | (6)
Operating Costs and Expenses |  |  |  |  |  |
Cost of operations | 2 |  | (7) |  | (9) | (6)
Depreciation and amortization | 0 |  | 0 |  | 0 | 0
Impairment losses |  |  | 0 |  |  | 0
Selling, general and administrative costs | 0 |  | 0 |  | 0 | 0
Reorganization costs |  |  | 0 |  | 0 | 0
Development costs | 0 |  | 0 |  | 0 | 0
Total operating costs and expenses | 2 |  | (7) |  | (9) | (6)
Gain on sale of assets |  |  | 0 |  | 0 | 0
Operating Income/(Loss) | 0 |  | 0 |  | 0 | 0
Other Income/(Expense) |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries | (586) |  | (432) |  | (851) | (741)
Equity in earnings/(losses) of unconsolidated affiliates | 0 |  |  |  | 0 | 0
Impairment losses on investments |  |  |  |  | 0 |
Other income, net | 0 |  | 0 |  | 0 | 0
Loss on debt extinguishment, net |  |  | 0 |  | 0 | 0
Interest expense | 0 |  | 0 |  | 0 | 0
Total other income/(expense) | (586) |  | (432) |  | (851) | (741)
Income from Continuing Operations Before Income Taxes | (586) |  | (432) |  | (851) | (741)
Income tax expense/(benefit) | 0 |  | 0 |  | 0 | 0
Income from Continuing Operations |  |  | (432) |  |  | (741)
Income from discontinued operations, net of income tax |  |  | 0 |  |  | 0
Net Income | (586) |  | (432) |  | (851) | (741)
Less: Net income attributable to redeemable noncontrolling interests |  |  | 0 |  |  | 0
Net Income Attributable to NRG Energy, Inc. | (586) |  | (432) |  | (851) | (741)
Guarantor Subsidiaries |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |
Total operating revenues | 2,055 |  | 2,140 |  | 3,833 | 3,909
Operating Costs and Expenses |  |  |  |  |  |
Cost of operations | 1,271 |  | 1,590 |  | 2,561 | 2,948
Depreciation and amortization | 80 |  | 51 |  | 160 | 105
Impairment losses |  |  | 1 |  |  | 1
Selling, general and administrative costs | 137 |  | 112 |  | 277 | 234
Reorganization costs |  |  | 0 |  | 0 | 0
Development costs | 0 |  | 0 |  | 0 | 0
Total operating costs and expenses | 1,488 |  | 1,754 |  | 2,998 | 3,288
Gain on sale of assets |  |  | 0 |  | 0 | 1
Operating Income/(Loss) | 567 |  | 386 |  | 835 | 622
Other Income/(Expense) |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries | 3 |  | 2 |  | 6 | 12
Equity in earnings/(losses) of unconsolidated affiliates | 0 |  |  |  | 0 | 0
Impairment losses on investments |  |  |  |  | 0 |
Other income, net | 7 |  | 4 |  | 10 | 8
Loss on debt extinguishment, net |  |  | 0 |  | 0 | 0
Interest expense | (4) |  | (3) |  | (9) | (7)
Total other income/(expense) | 6 |  | 3 |  | 7 | 13
Income from Continuing Operations Before Income Taxes | 573 |  | 389 |  | 842 | 635
Income tax expense/(benefit) | 0 |  | 0 |  | 0 | 0
Income from Continuing Operations |  |  | 389 |  |  | 635
Income from discontinued operations, net of income tax |  |  | 0 |  |  | 9
Net Income | 573 |  | 389 |  | 842 | 644
Less: Net income attributable to redeemable noncontrolling interests |  |  | 0 |  |  | 0
Net Income Attributable to NRG Energy, Inc. | 573 |  | 389 |  | 842 | 644
Non-Guarantor Subsidiaries |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |
Total operating revenues | 181 |  | 332 |  | 433 | 727
Operating Costs and Expenses |  |  |  |  |  |
Cost of operations | 154 |  | 252 |  | 356 | 535
Depreciation and amortization | 20 |  | 26 |  | 39 | 49
Impairment losses |  |  | 0 |  |  | 0
Selling, general and administrative costs | 7 |  | 12 |  | 12 | 28
Reorganization costs |  |  | 0 |  | 0 | 0
Development costs | 1 |  | 1 |  | 1 | 1
Total operating costs and expenses | 182 |  | 291 |  | 408 | 613
Gain on sale of assets |  |  | 1 |  | 1 | 1
Operating Income/(Loss) | (1) |  | 42 |  | 26 | 115
Other Income/(Expense) |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries | 0 |  | 0 |  | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates | 12 |  |  |  | 1 | (21)
Impairment losses on investments |  |  |  |  | (18) |
Other income, net | 5 |  | 8 |  | 4 | 9
Loss on debt extinguishment, net |  |  | 0 |  | 0 | 0
Interest expense | (2) |  | (5) |  | (3) | (9)
Total other income/(expense) | 15 |  | 3 |  | (16) | (21)
Income from Continuing Operations Before Income Taxes | 14 |  | 45 |  | 10 | 94
Income tax expense/(benefit) | 1 |  | 1 |  | 1 | 1
Income from Continuing Operations |  |  | 44 |  |  | 93
Income from discontinued operations, net of income tax |  |  | 0 |  |  | 5
Net Income | 13 |  | 44 |  | 9 | 98
Less: Net income attributable to redeemable noncontrolling interests |  |  | 1 |  |  | 1
Net Income Attributable to NRG Energy, Inc. | 13 |  | 43 |  | 9 | 97
NRG Energy, Inc. (Note Issuer) |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |
Total operating revenues | 0 |  | 0 |  | 0 | 0
Operating Costs and Expenses |  |  |  |  |  |
Cost of operations | 7 |  | 10 |  | (17) | 19
Depreciation and amortization | 10 |  | 8 |  | 20 | 16
Impairment losses |  |  | 0 |  |  | 0
Selling, general and administrative costs | 64 |  | 87 |  | 128 | 143
Reorganization costs |  |  | 2 |  | 3 | 15
Development costs | 1 |  | 1 |  | 4 | 3
Total operating costs and expenses | 82 |  | 108 |  | 138 | 196
Gain on sale of assets |  |  | 0 |  | 5 | 0
Operating Income/(Loss) | (82) |  | (108) |  | (133) | (196)
Other Income/(Expense) |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries | 583 |  | 430 |  | 845 | 729
Equity in earnings/(losses) of unconsolidated affiliates | 0 |  |  |  | 0 | 0
Impairment losses on investments |  |  |  |  | 0 |
Other income, net | 2 |  | 8 |  | 27 | 15
Loss on debt extinguishment, net |  |  | (47) |  | (1) | (47)
Interest expense | (90) |  | (97) |  | (181) | (203)
Total other income/(expense) | 495 |  | 294 |  | 690 | 494
Income from Continuing Operations Before Income Taxes | 413 |  | 186 |  | 557 | 298
Income tax expense/(benefit) | 100 |  | (2) |  | 123 | 2
Income from Continuing Operations |  |  | 188 |  |  | 296
Income from discontinued operations, net of income tax |  |  | 13 |  |  | 387
Net Income | 313 |  | 201 |  | 434 | 683
Less: Net income attributable to redeemable noncontrolling interests |  |  | 0 |  |  | 0
Net Income Attributable to NRG Energy, Inc. | $ 313 |  | $ 201 |  | $ 434 | $ 683

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