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Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Financial Statements, Captions [Line Items]            
Net Income $ 313   $ 202   $ 434 $ 684
Other Comprehensive Income            
Foreign currency translation adjustments, net 13   (1)   (2) 0
Available-for-sale securities 0   1   0 1
Defined benefit plans, net 0   (3)   0 (6)
Other comprehensive (loss) income, net of tax 13 $ (15) (3) $ (2) (2) (5)
Comprehensive Income 326   199   432 679
Less: Comprehensive income attributable to redeemable noncontrolling interest 0   1   0 1
Comprehensive Income Attributable to NRG Energy, Inc. 326   198   432 678
Eliminations            
Condensed Financial Statements, Captions [Line Items]            
Net Income (586)   (432)   (851) (741)
Other Comprehensive Income            
Foreign currency translation adjustments, net (25)   2   5  
Available-for-sale securities     0     0
Defined benefit plans, net (1)   0   (3) 0
Other comprehensive (loss) income, net of tax (26)   2   2 0
Comprehensive Income     (430)     (741)
Less: Comprehensive income attributable to redeemable noncontrolling interest     0     0
Comprehensive Income Attributable to NRG Energy, Inc. (612)   (430)   (849) (741)
Guarantor Subsidiaries            
Condensed Financial Statements, Captions [Line Items]            
Net Income 573   389   842 644
Other Comprehensive Income            
Foreign currency translation adjustments, net 12   (1)   (3)  
Available-for-sale securities     0     0
Defined benefit plans, net 1   0   3 0
Other comprehensive (loss) income, net of tax 13   (1)   0 0
Comprehensive Income     388     644
Less: Comprehensive income attributable to redeemable noncontrolling interest     0     0
Comprehensive Income Attributable to NRG Energy, Inc. 586   388   842 644
Non-Guarantor Subsidiaries            
Condensed Financial Statements, Captions [Line Items]            
Net Income 13   44   9 98
Other Comprehensive Income            
Foreign currency translation adjustments, net 13   (1)   (2)  
Available-for-sale securities     0     0
Defined benefit plans, net 0   0   0 0
Other comprehensive (loss) income, net of tax 13   (1)   (2) 0
Comprehensive Income     43     98
Less: Comprehensive income attributable to redeemable noncontrolling interest     1     1
Comprehensive Income Attributable to NRG Energy, Inc. 26   42   7 97
NRG Energy, Inc. (Note Issuer)            
Condensed Financial Statements, Captions [Line Items]            
Net Income 313   201   434 683
Other Comprehensive Income            
Foreign currency translation adjustments, net 13   (1)   (2)  
Available-for-sale securities     1     1
Defined benefit plans, net 0   (3)   0 (6)
Other comprehensive (loss) income, net of tax 13   (3)   (2) (5)
Comprehensive Income     198     678
Less: Comprehensive income attributable to redeemable noncontrolling interest     0     0
Comprehensive Income Attributable to NRG Energy, Inc. $ 326   $ 198   $ 432 $ 678