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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

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