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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information      
Total operating revenues $ 2,165 $ 2,065  
Depreciation and amortization 85 120  
Reorganization costs 13 20  
Equity in losses of unconsolidated affiliates (21) 1  
Income/(loss) from continuing operations before income taxes 98 244  
Income/(loss) from continuing operations 94 238  
Income/(Loss) from discontinued operations, net of income tax 388 (5)  
Net Income 482 233  
Net Income/(Loss)attributable to NRG Energy, Inc. 482 279  
Total assets 9,530   $ 10,628
Eliminations      
Segment Reporting Information      
Total operating revenues (266) 314  
Depreciation and amortization 0 (1)  
Reorganization costs 0 0  
Equity in losses of unconsolidated affiliates (28) 0  
Income/(loss) from continuing operations before income taxes (27) 1  
Income/(loss) from continuing operations (27) 1  
Income/(Loss) from discontinued operations, net of income tax 0 0  
Net Income   1  
Net Income/(Loss)attributable to NRG Energy, Inc. (27) 1  
Total assets (4,948)    
Retail | Operating Segments      
Segment Reporting Information      
Total operating revenues 1,607 1,480  
Depreciation and amortization 31 26  
Reorganization costs 1 3  
Equity in losses of unconsolidated affiliates 0 0  
Income/(loss) from continuing operations before income taxes 111 944  
Income/(loss) from continuing operations 111 944  
Income/(Loss) from discontinued operations, net of income tax 0 0  
Net Income   944  
Net Income/(Loss)attributable to NRG Energy, Inc. 111 943  
Total assets 3,309    
Retail | Eliminations      
Segment Reporting Information      
Total operating revenues (3) (1)  
Generation | Operating Segments      
Segment Reporting Information      
Total operating revenues 823 270  
Depreciation and amortization 46 86  
Reorganization costs 1 4  
Equity in losses of unconsolidated affiliates (20) 2  
Income/(loss) from continuing operations before income taxes 114 (573)  
Income/(loss) from continuing operations 114 (573)  
Income/(Loss) from discontinued operations, net of income tax 0 0  
Net Income   (573)  
Net Income/(Loss)attributable to NRG Energy, Inc. 114 (565)  
Total assets 5,489    
Generation | Eliminations      
Segment Reporting Information      
Total operating revenues (235) 309  
Corporate | Operating Segments      
Segment Reporting Information      
Total operating revenues 1 1  
Depreciation and amortization 8 9  
Reorganization costs 11 13  
Equity in losses of unconsolidated affiliates 27 (1)  
Income/(loss) from continuing operations before income taxes (100) (128)  
Income/(loss) from continuing operations (104) (134)  
Income/(Loss) from discontinued operations, net of income tax 388 (5)  
Net Income   (139)  
Net Income/(Loss)attributable to NRG Energy, Inc. 284 (100)  
Total assets 5,680    
Corporate | Eliminations      
Segment Reporting Information      
Total operating revenues $ (28) $ 6