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Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]        
Net Income $ 372 $ (49) $ 1,056 $ 281
Other Comprehensive (Loss)/Income        
Unrealized gain/(loss) on derivatives, net 0 5 0 24
Foreign currency translation adjustments, net (4) (2) (4) (8)
Available-for-sale securities, net (14) 0 (13) 1
Defined benefit plans, net (41) (1) (47) (3)
Other comprehensive (loss)/income (59) 2 (64) 14
Comprehensive Income/(Loss) 313 (47) 992 295
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable interests 0 26 1 15
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total 313 (73) 991 280
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Net Income (557) (403) (1,298) (1,095)
Other Comprehensive (Loss)/Income        
Unrealized gain/(loss) on derivatives, net   7   (15)
Foreign currency translation adjustments, net 9 3 9 17
Available-for-sale securities, net 0   0 0
Defined benefit plans, net 40 0 40 0
Other comprehensive (loss)/income 49 10 49 2
Comprehensive Income/(Loss)   (393) (1,249) (1,093)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable interests   73 0 75
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total (508) (466) (1,249) (1,168)
Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Income 588 307 1,232 849
Other Comprehensive (Loss)/Income        
Unrealized gain/(loss) on derivatives, net   0   0
Foreign currency translation adjustments, net (5) (2) (5) (8)
Available-for-sale securities, net 0   0 0
Defined benefit plans, net (40) 0 (40) 0
Other comprehensive (loss)/income (45) (2) (45) (8)
Comprehensive Income/(Loss)   305 1,187 841
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable interests   0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total 543 305 1,187 841
Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net Income (31) 107 67 140
Other Comprehensive (Loss)/Income        
Unrealized gain/(loss) on derivatives, net   10   30
Foreign currency translation adjustments, net (4) (2) (4) (8)
Available-for-sale securities, net 0   0 0
Defined benefit plans, net 0 0 0 0
Other comprehensive (loss)/income (4) 8 (4) 22
Comprehensive Income/(Loss)   115 63 162
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable interests   (58) 1 (167)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total (35) 173 62 329
NRG Energy, Inc. (Note Issuer)        
Condensed Financial Statements, Captions [Line Items]        
Net Income 372 (60) 1,055 387
Other Comprehensive (Loss)/Income        
Unrealized gain/(loss) on derivatives, net   (12)   9
Foreign currency translation adjustments, net (4) (1) (4) (9)
Available-for-sale securities, net (14)   (13) 1
Defined benefit plans, net (41) (1) (47) (3)
Other comprehensive (loss)/income (59) (14) (64) (2)
Comprehensive Income/(Loss)   (74) 991 385
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable interests   11 0 107
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total $ 313 $ (85) $ 991 $ 278