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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Condensed Financial Statements, Captions [Line Items]                
Net Income $ 249     $ 372     $ 683 $ 1,056
Other Comprehensive Income                
Foreign currency translation adjustments, net 4     (4)     2 (4)
Available-for-sale securities 0     (14)     0 (13)
Defined benefit plans, net 0     (41)     0 (47)
Other comprehensive income/(loss) 4 $ 13 $ (15) (59) $ (3) $ (2) 2 (64)
Comprehensive Income/(Loss) 253     313     685 992
Less: Comprehensive income attributable to redeemable noncontrolling interest 0     0     0 1
Comprehensive Income Attributable to NRG Energy, Inc. 253     313     685 991
Eliminations                
Condensed Financial Statements, Captions [Line Items]                
Net Income (540)     (557)     (1,391) (1,298)
Other Comprehensive Income                
Foreign currency translation adjustments, net (8)     9     (3) 9
Available-for-sale securities       0       0
Defined benefit plans, net (2)     40     (5) 40
Other comprehensive income/(loss) (10)     49     (8) 49
Comprehensive Income/(Loss)       (508)       (1,249)
Less: Comprehensive income attributable to redeemable noncontrolling interest               0
Comprehensive Income Attributable to NRG Energy, Inc. (550)           (1,399) (1,249)
Guarantor Subsidiaries                
Condensed Financial Statements, Captions [Line Items]                
Net Income 492     588     1,334 1,232
Other Comprehensive Income                
Foreign currency translation adjustments, net 5     (5)     2 (5)
Available-for-sale securities       0       0
Defined benefit plans, net 2     (40)     5 (40)
Other comprehensive income/(loss) 7     (45)     7 (45)
Comprehensive Income/(Loss)       543       1,187
Less: Comprehensive income attributable to redeemable noncontrolling interest               0
Comprehensive Income Attributable to NRG Energy, Inc. 499           1,341 1,187
Non-Guarantor Subsidiaries                
Condensed Financial Statements, Captions [Line Items]                
Net Income 48     (31)     57 67
Other Comprehensive Income                
Foreign currency translation adjustments, net 3     (4)     1 (4)
Available-for-sale securities       0       0
Defined benefit plans, net 0     0     0 0
Other comprehensive income/(loss) 3     (4)     1 (4)
Comprehensive Income/(Loss)       (35)       63
Less: Comprehensive income attributable to redeemable noncontrolling interest               1
Comprehensive Income Attributable to NRG Energy, Inc. 51           58 62
NRG Energy, Inc. (Note Issuer)                
Condensed Financial Statements, Captions [Line Items]                
Net Income 249     372     683 1,055
Other Comprehensive Income                
Foreign currency translation adjustments, net 4     (4)     2 (4)
Available-for-sale securities       (14)       (13)
Defined benefit plans, net 0     (41)     0 (47)
Other comprehensive income/(loss) 4     (59)     2 (64)
Comprehensive Income/(Loss)       $ 313       991
Less: Comprehensive income attributable to redeemable noncontrolling interest               0
Comprehensive Income Attributable to NRG Energy, Inc. $ 253           $ 685 $ 991