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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information                
Operating revenues $ 2,809     $ 2,996     $ 7,066 $ 7,626
Depreciation and amortization 99     91     318 261
Impairment losses 29     0     29 1
Reorganization costs 0     1     3 16
Gain on sale of assets             6 2
Equity in earnings of unconsolidated affiliates 36     29     37 8
Loss on debt extinguishment, net 0     0     (1) (47)
Income from Continuing Operations Before Income Taxes 341     380     899 666
Income/(loss) from continuing operations 249     374     683 657
Loss from discontinued operations, net of tax 0     (2)     0 399
Net Income 249     372     683 1,056
Net income attributable to NRG Energy, Inc. 249 $ 313 $ 121 372 $ 201 $ 482 683 1,055
Eliminations                
Segment Reporting Information                
Operating revenues 2     (2)     (1) (7)
Depreciation and amortization 0     0     0 0
Impairment losses 0           0  
Reorganization costs               0
Gain on sale of assets             0 0
Equity in earnings of unconsolidated affiliates 0     0     0 0
Loss on debt extinguishment, net               0
Income from Continuing Operations Before Income Taxes 0     1     0 0
Income/(loss) from continuing operations 0     1     0 0
Loss from discontinued operations, net of tax       0       0
Net Income       1       0
Net income attributable to NRG Energy, Inc. 0     1     0 0
Texas | Operating Segments                
Segment Reporting Information                
Operating revenues 1,992     2,208     4,928 5,511
Depreciation and amortization 49     45     167 125
Impairment losses 0           0  
Reorganization costs               5
Gain on sale of assets             0 0
Equity in earnings of unconsolidated affiliates 0     1     (3) (5)
Loss on debt extinguishment, net               0
Income from Continuing Operations Before Income Taxes 288     348     800 757
Income/(loss) from continuing operations 288     348     800 757
Loss from discontinued operations, net of tax       0       0
Net Income       348       757
Net income attributable to NRG Energy, Inc. 288     348     800 757
East | Operating Segments                
Segment Reporting Information                
Operating revenues 693     679     1,798 1,812
Depreciation and amortization 34     31     100 87
Impairment losses 0           0  
Reorganization costs               0
Gain on sale of assets             0 1
Equity in earnings of unconsolidated affiliates 0     0     0 0
Loss on debt extinguishment, net               0
Income from Continuing Operations Before Income Taxes 149     121     319 280
Income/(loss) from continuing operations 149     121     319 280
Loss from discontinued operations, net of tax       0       0
Net Income       121       280
Net income attributable to NRG Energy, Inc. 149     121     319 280
West/Other | Operating Segments                
Segment Reporting Information                
Operating revenues 122     111     341 310
Depreciation and amortization 9     8     25 26
Impairment losses 29           29  
Reorganization costs               0
Gain on sale of assets             1 0
Equity in earnings of unconsolidated affiliates 36     28     40 13
Loss on debt extinguishment, net               0
Income from Continuing Operations Before Income Taxes 17     16     84 11
Income/(loss) from continuing operations 17     15     83 10
Loss from discontinued operations, net of tax       0       0
Net Income       15       10
Net income attributable to NRG Energy, Inc. 17     15     83 9
Corporate | Operating Segments                
Segment Reporting Information                
Operating revenues 0     0     0 0
Depreciation and amortization 7     7     26 23
Impairment losses 0           0  
Reorganization costs               11
Gain on sale of assets             5 1
Equity in earnings of unconsolidated affiliates 0     0     0 0
Loss on debt extinguishment, net               (47)
Income from Continuing Operations Before Income Taxes (113)     (106)     (304) (382)
Income/(loss) from continuing operations (205)     (111)     (519) (390)
Loss from discontinued operations, net of tax       (2)       399
Net Income       (113)       9
Net income attributable to NRG Energy, Inc. $ (205)     $ (113)     $ (519) $ 9