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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net Income $ 510 $ 4,441 $ 268
Other Comprehensive Income/(Loss), net of tax      
Unrealized gain on derivatives, net of income tax 0 0 23
Foreign currency translation adjustments, net of income tax 8 (1) (11)
Available-for-sale securities, net of income tax 0 (19) 1
Defined benefit plans, net of income tax (22) (78) (35)
Other comprehensive (loss) (14) (98) (22)
Comprehensive Income 496 4,343 246
Less: Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests 0 3 14
Comprehensive Income Attributable to NRG Energy, Inc. $ 496 $ 4,340 $ 232