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Condensed Consolidating Financial Information - COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |
Net Income | $ 482 | $ 233
Other Comprehensive Income/(Loss), net of tax |  |
Unrealized gain on derivatives, net | 0 | 14
Foreign currency translation adjustments, net | 1 | (2)
Defined benefit plans, net | (3) | (1)
Other comprehensive (loss)/income | (2) | 11
Comprehensive Income/(Loss) | 480 | 244
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest | 0 | (38)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. | 480 | 282
Eliminations |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net Income | (309) | (333)
Other Comprehensive Income/(Loss), net of tax |  |
Unrealized gain on derivatives, net |  | (17)
Foreign currency translation adjustments, net | (2) | 5
Defined benefit plans, net | 0 | 0
Other comprehensive (loss)/income | (2) | (12)
Comprehensive Income/(Loss) |  | (345)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest |  | (16)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. | (311) | (329)
Guarantor Subsidiaries |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net Income | 255 | 331
Other Comprehensive Income/(Loss), net of tax |  |
Unrealized gain on derivatives, net |  | 0
Foreign currency translation adjustments, net | 1 | (2)
Defined benefit plans, net | 0 | 0
Other comprehensive (loss)/income | 1 | (2)
Comprehensive Income/(Loss) |  | 329
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest |  | 0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. | 256 | 329
Non-Guarantor Subsidiaries |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net Income | 54 | (61)
Other Comprehensive Income/(Loss), net of tax |  |
Unrealized gain on derivatives, net |  | 16
Foreign currency translation adjustments, net | 1 | (2)
Defined benefit plans, net | 0 | 0
Other comprehensive (loss)/income | 1 | 14
Comprehensive Income/(Loss) |  | (47)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest |  | (46)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. | 55 | (1)
NRG Energy, Inc. (Note Issuer) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net Income | 482 | 296
Other Comprehensive Income/(Loss), net of tax |  |
Unrealized gain on derivatives, net |  | 15
Foreign currency translation adjustments, net | 1 | (3)
Defined benefit plans, net | (3) | (1)
Other comprehensive (loss)/income | (2) | 11
Comprehensive Income/(Loss) |  | 307
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest |  | 24
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. | $ 480 | $ 283

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