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Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Net Income/(Loss) $ 121 $ 482
Other Comprehensive Loss    
Foreign currency translation adjustments, net (15) 1
Defined benefit plans, net 0 (3)
Other comprehensive income/(loss) (15) (2)
Comprehensive Income 106 480
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net Income/(Loss) (265) (309)
Other Comprehensive Loss    
Foreign currency translation adjustments, net 30 (2)
Defined benefit plans, net (2) 0
Other comprehensive income/(loss) 28 (2)
Comprehensive Income (237) (311)
Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net Income/(Loss) 269 255
Other Comprehensive Loss    
Foreign currency translation adjustments, net (15) 1
Defined benefit plans, net 2 0
Other comprehensive income/(loss) (13) 1
Comprehensive Income 256 256
Non-Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net Income/(Loss) (4) 54
Other Comprehensive Loss    
Foreign currency translation adjustments, net (15) 1
Defined benefit plans, net 0 0
Other comprehensive income/(loss) (15) 1
Comprehensive Income (19) 55
NRG Energy, Inc. (Note Issuer)    
Condensed Financial Statements, Captions [Line Items]    
Net Income/(Loss) 121 482
Other Comprehensive Loss    
Foreign currency translation adjustments, net (15) 1
Defined benefit plans, net 0 (3)
Other comprehensive income/(loss) (15) (2)
Comprehensive Income $ 106 $ 480