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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