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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, 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
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total 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 Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  | 7,108 | 6,886 | 6,676
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 421 | 596 | 756
Impairment losses |  |  |  |  |  |  |  |  |  | 99 | 1,534 | 483
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 799 | 836 | 1,032
Reorganization costs |  |  |  |  |  |  |  |  |  | 90 | 44 |
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)
Operating Income/(Loss) |  | 49 | 398 | 174 | 361 | (1,200) | 275 | 214 | (30) | 982 | (741) | 33
Other Income/(Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 9 | (14) | (18)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (15) | (79) | (268)
Other income, net |  |  |  |  |  |  |  |  |  | 18 | 51 | 47
Loss on debt extinguishment, net |  |  |  |  |  |  |  |  |  | (44) | (49) | (142)
Interest expense |  |  |  |  |  |  |  |  |  | (483) | (557) | (583)
Total other expense |  |  |  |  |  |  |  |  |  | (515) | (648) | (964)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 467 | (1,389) | (931)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 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 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)
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | (26) | (48) | (74)
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  | (26) | (46) | (80)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  |  | (74) | (2) | 0
Reorganization costs |  |  |  |  |  |  |  |  |  | 0 | 0 |
Development costs |  |  |  |  |  |  |  |  |  | (1) | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | (101) | (48) | (80)
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income/(Loss) |  |  |  |  |  |  |  |  |  | 75 | 0 | 6
Other Income/(Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  | (1,314) | (46) | (324)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 0 | (10)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss on debt extinguishment, net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other expense |  |  |  |  |  |  |  |  |  | (1,314) | (46) | (334)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (1,239) | (46) | (328)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | (1,239) | (46) | (328)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | (1,239) | (46) | (328)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 75 | 0 | (4)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | (1,314) | (46) | (324)
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 8,119 | 7,818 | 7,539
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  | 6,147 | 5,998 | 5,581
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 238 | 343 | 500
Impairment losses |  |  |  |  |  |  |  |  |  | 6 | 1,346 | 370
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 462 | 410 | 430
Reorganization costs |  |  |  |  |  |  |  |  |  | 4 | 6 |
Development costs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 6,857 | 8,103 | 6,881
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 4 | 4 | (1)
Operating Income/(Loss) |  |  |  |  |  |  |  |  |  | 1,266 | (281) | 657
Other Income/(Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  | 23 | 18 | (50)
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0 | 0 | 5
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income, net |  |  |  |  |  |  |  |  |  | 32 | 9 | 5
Loss on debt extinguishment, net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (14) | (14) | (15)
Total other expense |  |  |  |  |  |  |  |  |  | 41 | 13 | (55)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 1,307 | (268) | 602
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 372 | (598) | (1)
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 935 | 330 | 603
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 62 | 91 | 86
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 997 | 421 | 689
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 997 | 421 | 689
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 1,385 | 1,304 | 1,450
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  | 959 | 862 | 1,116
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 150 | 221 | 230
Impairment losses |  |  |  |  |  |  |  |  |  | 93 | 188 | 113
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 63 | 64 | 144
Reorganization costs |  |  |  |  |  |  |  |  |  | 0 | 0 |
Development costs |  |  |  |  |  |  |  |  |  | 1 | 4 | 18
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 1,266 | 1,339 | 1,621
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 28 | 12 | 0
Operating Income/(Loss) |  |  |  |  |  |  |  |  |  | 147 | (23) | (171)
Other Income/(Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 10 | (10) | (9)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | (15) | (75) | (252)
Other income, net |  |  |  |  |  |  |  |  |  | (13) | 14 | 15
Loss on debt extinguishment, net |  |  |  |  |  |  |  |  |  | 0 | 0 | (4)
Interest expense |  |  |  |  |  |  |  |  |  | (49) | (91) | (85)
Total other expense |  |  |  |  |  |  |  |  |  | (67) | (162) | (335)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 80 | (185) | (506)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | 19 | (62) | 28
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 61 | (123) | (534)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | 75 | (420) | 0
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 136 | (543) | (534)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | (181) | (168) | (169)
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | 317 | (375) | (365)
NRG Energy, Inc. (Note Issuer) |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Cost of operations |  |  |  |  |  |  |  |  |  | 28 | 72 | 59
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 33 | 32 | 26
Impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 348 | 364 | 458
Reorganization costs |  |  |  |  |  |  |  |  |  | 86 | 38 |
Development costs |  |  |  |  |  |  |  |  |  | 11 | 18 | 30
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 506 | 524 | 573
Other income - affiliate |  |  |  |  |  |  |  |  |  |  | 87 | 193
Gain on sale of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | (79)
Operating Income/(Loss) |  |  |  |  |  |  |  |  |  | (506) | (437) | (459)
Other Income/(Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of consolidated subsidiaries |  |  |  |  |  |  |  |  |  | 1,291 | 28 | 374
Equity in earnings/(losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (1) | (4) | (4)
Impairment losses on investments |  |  |  |  |  |  |  |  |  | 0 | (4) | (16)
Other income, net |  |  |  |  |  |  |  |  |  | (1) | 28 | 27
Loss on debt extinguishment, net |  |  |  |  |  |  |  |  |  | (44) | (49) | (138)
Interest expense |  |  |  |  |  |  |  |  |  | (420) | (452) | (483)
Total other expense |  |  |  |  |  |  |  |  |  | 825 | (453) | (240)
Income/(Loss) from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 319 | (890) | (699)
Income tax (benefit)/expense |  |  |  |  |  |  |  |  |  | (384) | 616 | (2)
Net Income/(Loss) from Continuing Operations |  |  |  |  |  |  |  |  |  | 703 | (1,506) | (697)
(Loss)/income from discontinued operations, net of income tax |  |  |  |  |  |  |  |  |  | (329) | (663) | (21)
Net Income/(Loss) |  |  |  |  |  |  |  |  |  | 374 | (2,169) | (718)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 106 | (16) | 56
Net Income/(Loss) Attributable to NRG Energy, Inc. |  |  |  |  |  |  |  |  |  | $ 268 | $ (2,153) | $ (774)

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