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Segment Reporting (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
Segment Reporting Information            
Operating revenues $ 2,238   $ 2,465   $ 4,257 $ 4,630
Depreciation and amortization 110   85   219 170
Impairment losses 0   1   0 1
Reorganization costs 0   2   3 15
Gain on sale of assets     1   6 2
Equity in (losses)/earnings of unconsolidated affiliates 12   0   1 (21)
Impairment losses on investments 0   0   (18) 0
Loss on debt extinguishment, net 0   (47)   (1) (47)
Income from Continuing Operations Before Income Taxes 414   188   558 286
Income/(loss) from continuing operations 313   189   434 283
Income from discontinued operations, net of tax 0   13   0 401
Net Income 313   202   434 684
Net income attributable to NRG Energy, Inc. 313 $ 121 201 $ 482 434 683
Eliminations            
Segment Reporting Information            
Operating revenues 0   (3)   (3) (5)
Depreciation and amortization 0   0   0 0
Impairment losses     0     0
Reorganization costs     0   0 0
Gain on sale of assets     0   0 0
Equity in (losses)/earnings of unconsolidated affiliates 0   0   0 0
Impairment losses on investments         0  
Loss on debt extinguishment, net     0   0 0
Income from Continuing Operations Before Income Taxes 1   0   0 (1)
Income/(loss) from continuing operations 1   0   0 (1)
Income from discontinued operations, net of tax     0     0
Net Income     0     (1)
Net income attributable to NRG Energy, Inc. 1   0   0 (1)
Texas | Operating Segments            
Segment Reporting Information            
Operating revenues 1,578   1,837   2,936 3,303
Depreciation and amortization 59   40   118 80
Impairment losses     1     1
Reorganization costs     3   1 4
Gain on sale of assets     0   0 0
Equity in (losses)/earnings of unconsolidated affiliates (3)   (3)   (3) (6)
Impairment losses on investments         (18)  
Loss on debt extinguishment, net     0   0 0
Income from Continuing Operations Before Income Taxes 350   259   512 409
Income/(loss) from continuing operations 350   259   512 409
Income from discontinued operations, net of tax     0     0
Net Income     259     409
Net income attributable to NRG Energy, Inc. 350   259   512 409
East | Operating Segments            
Segment Reporting Information            
Operating revenues 566   524   1,105 1,133
Depreciation and amortization 33   30   66 56
Impairment losses     0     0
Reorganization costs     0   0 0
Gain on sale of assets     0   0 1
Equity in (losses)/earnings of unconsolidated affiliates 0   0   0 0
Impairment losses on investments         0  
Loss on debt extinguishment, net     0   (1) 0
Income from Continuing Operations Before Income Taxes 146   60   170 159
Income/(loss) from continuing operations 146   60   170 159
Income from discontinued operations, net of tax     0     0
Net Income     60     159
Net income attributable to NRG Energy, Inc. 146   60   170 159
West/Other | Operating Segments            
Segment Reporting Information            
Operating revenues 94   106   219 199
Depreciation and amortization 8   7   16 18
Impairment losses     0     0
Reorganization costs     0   0 0
Gain on sale of assets     0   1 0
Equity in (losses)/earnings of unconsolidated affiliates 15   3   4 (15)
Impairment losses on investments         0  
Loss on debt extinguishment, net     0   0 0
Income from Continuing Operations Before Income Taxes 26   18   67 (5)
Income/(loss) from continuing operations 25   18   66 (5)
Income from discontinued operations, net of tax     0     0
Net Income     18     (5)
Net income attributable to NRG Energy, Inc. 25   17   66 (6)
Corporate | Operating Segments            
Segment Reporting Information            
Operating revenues 0   1   0 0
Depreciation and amortization 10   8   19 16
Impairment losses     0     0
Reorganization costs     (1)   2 11
Gain on sale of assets     1   5 1
Equity in (losses)/earnings of unconsolidated affiliates 0   0   0 0
Impairment losses on investments         0  
Loss on debt extinguishment, net     (47)   0 (47)
Income from Continuing Operations Before Income Taxes (109)   (149)   (191) (276)
Income/(loss) from continuing operations (209)   (148)   (314) (279)
Income from discontinued operations, net of tax     13     401
Net Income     (135)     122
Net income attributable to NRG Energy, Inc. $ (209)   $ (135)   $ (314) $ 122