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Condensed Consolidating Financial Information - Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net income $ 3,385 $ 372 $ 202 $ 482 $ (13) $ (49) $ 96 $ 233 $ 4,441 $ 268 $ (2,337)
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Unrealized gain on derivatives, net                 0 23 13
Foreign currency translation adjustments, net                 (1) (11) 12
Available-for-sale securities, net                 (19) 1 (8)
Defined benefit plan, net                 (78) (35) 46
Other comprehensive (loss)/income                 (98) (22) 63
Comprehensive Income/(Loss)                 4,343 246 (2,274)
Less: Comprehensive income attributable to redeemable noncontrolling interests                 3 14 (179)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 4,340 232 (2,095)
Eliminations                      
Net income                 (1,610) (1,239) (46)
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Unrealized gain on derivatives, net                   (15) (26)
Foreign currency translation adjustments, net                 1 22 (1)
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 17 9 (17)
Other comprehensive (loss)/income                 18 16 (44)
Comprehensive Income/(Loss)                 (1,592) (1,223) (90)
Less: Comprehensive income attributable to redeemable noncontrolling interests                 0 76 (60)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 (1,592) (1,299) (30)
Guarantor Subsidiaries                      
Net income                 1,493 997 421
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Unrealized gain on derivatives, net                   0 1
Foreign currency translation adjustments, net                 0 (10) 6
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 (17) (9) (13)
Other comprehensive (loss)/income                 (17) (19) (6)
Comprehensive Income/(Loss)                 1,476 978 415
Less: Comprehensive income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 1,476 978 415
Non-Guarantor Subsidiaries                      
Net income                 120 136 (543)
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Unrealized gain on derivatives, net                   29 13
Foreign currency translation adjustments, net                 (1) (10) 7
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 0 0 30
Other comprehensive (loss)/income                 (1) 19 50
Comprehensive Income/(Loss)                 119 155 (493)
Less: Comprehensive income attributable to redeemable noncontrolling interests                 3 (166) (103)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 116 321 (390)
NRG Energy, Inc. (Note Issuer)                      
Net income                 4,438 374 (2,169)
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Unrealized gain on derivatives, net                   9 25
Foreign currency translation adjustments, net                 (1) (13) 0
Available-for-sale securities, net                 (19) 1 (8)
Defined benefit plan, net                 (78) (35) 46
Other comprehensive (loss)/income                 (98) (38) 63
Comprehensive Income/(Loss)                 4,340 336 (2,106)
Less: Comprehensive income attributable to redeemable noncontrolling interests                 0 104 (16)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 $ 4,340 $ 232 $ (2,090)