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Condensed Consolidating Financial Information - COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]        
Net Income $ (48) $ 163 $ 281 $ (682)
Other Comprehensive Income/(Loss), net of tax        
Unrealized gain/(loss) on derivatives, net 4 7 24 7
Foreign currency translation adjustments, net (2) 2 (8) 9
Available-for-sale securities, net 0 1 1 2
Defined benefit plans, net (1) (1) (3) 25
Other comprehensive income 1 9 14 43
Comprehensive (loss) income (47) 172 295 (639)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest 26 (5) 15 (61)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. (73) 177 280 (578)
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Net Income (399) (500) (1,095) (827)
Other Comprehensive Income/(Loss), net of tax        
Unrealized gain/(loss) on derivatives, net 7 (109) (15) (109)
Foreign currency translation adjustments, net 3 (4) 17 (13)
Available-for-sale securities, net   0 0 0
Defined benefit plans, net 0 (20) 0 (49)
Other comprehensive income 10 (133) 2 (171)
Comprehensive (loss) income (389) (633) (1,093) (998)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest 73 (34) 75 (69)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. (462) (599) (1,168) (929)
Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Income 306 342 849 737
Other Comprehensive Income/(Loss), net of tax        
Unrealized gain/(loss) on derivatives, net 0 52 0 52
Foreign currency translation adjustments, net (2) 1 (8) 6
Available-for-sale securities, net   0 0 0
Defined benefit plans, net 0 10 0 10
Other comprehensive income (2) 63 (8) 68
Comprehensive (loss) income 304 405 841 805
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest 0 0 0 0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. 304 405 841 805
Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Income 105 121 140 (28)
Other Comprehensive Income/(Loss), net of tax        
Unrealized gain/(loss) on derivatives, net 10 58 30 57
Foreign currency translation adjustments, net (2) 1 (8) 6
Available-for-sale securities, net   0 0 0
Defined benefit plans, net 0 10 0 39
Other comprehensive income 8 69 22 102
Comprehensive (loss) income 113 190 162 74
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest (58) (3) (167) (49)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. 171 193 329 123
NRG Energy, Inc. (Note Issuer)        
Condensed Financial Statements, Captions [Line Items]        
Net Income (60) 200 387 (564)
Other Comprehensive Income/(Loss), net of tax        
Unrealized gain/(loss) on derivatives, net (13) 6 9 7
Foreign currency translation adjustments, net (1) 4 (9) 10
Available-for-sale securities, net   1 1 2
Defined benefit plans, net (1) (1) (3) 25
Other comprehensive income (15) 10 (2) 44
Comprehensive (loss) income (75) 210 385 (520)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest 11 32 107 57
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. $ (86) $ 178 $ 278 $ (577)