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Segment Reporting (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
MW
Mar. 31, 2017
USD ($)
Mar. 30, 2018
MW
Dec. 31, 2017
USD ($)
MW
Segment Reporting Information        
Generation capacity (in MW) | MW 30,000      
Operating revenues $ 2,421 $ 2,382    
Depreciation and amortization 235 257    
Reorganization costs 20 0    
Equity in earnings/(losses) of unconsolidated affiliates (2) 5    
Income/(loss) from continuing operations before income taxes 232 (173)    
Income/(loss) from continuing operations 233 (169)    
Loss from discontinued operations, net of income tax 0 (34)    
Net Income/(Loss) 233 (203)    
Net income/(loss) attributable to NRG Energy, Inc. 279 (163)    
Total assets 23,752     $ 23,318
Includes other income - affiliate 0 48    
Eliminations        
Segment Reporting Information        
Operating revenues 300 (244)    
Depreciation and amortization 0 0    
Reorganization costs 0      
Equity in earnings/(losses) of unconsolidated affiliates (7) (4)    
Income/(loss) from continuing operations before income taxes (11) (4)    
Income/(loss) from continuing operations (11) (4)    
Loss from discontinued operations, net of income tax   0    
Net Income/(Loss) (11) (4)    
Net income/(loss) attributable to NRG Energy, Inc. 1 (7)    
Total assets (9,743)      
Retail | Operating Segments        
Segment Reporting Information        
Operating revenues 1,481 1,335    
Depreciation and amortization 28 28    
Reorganization costs 3      
Equity in earnings/(losses) of unconsolidated affiliates 0 0    
Income/(loss) from continuing operations before income taxes 946 (31)    
Income/(loss) from continuing operations 946 (34)    
Loss from discontinued operations, net of income tax   0    
Net Income/(Loss) 946 (34)    
Net income/(loss) attributable to NRG Energy, Inc. 940 (33)    
Total assets 3,521      
Includes other income - affiliate   0    
Retail | Eliminations        
Segment Reporting Information        
Operating revenues (1) (1)    
Generation | Operating Segments        
Segment Reporting Information        
Operating revenues 327 965    
Depreciation and amortization 67 97    
Reorganization costs 4      
Equity in earnings/(losses) of unconsolidated affiliates 2 (13)    
Income/(loss) from continuing operations before income taxes (536) 37    
Income/(loss) from continuing operations (536) 37    
Loss from discontinued operations, net of income tax   0    
Net Income/(Loss) (536) 37    
Net income/(loss) attributable to NRG Energy, Inc. (536) 37    
Total assets 7,313      
Includes other income - affiliate   0    
Generation | Eliminations        
Segment Reporting Information        
Operating revenues 307 (209)    
Renewables | Operating Segments        
Segment Reporting Information        
Operating revenues 86 95    
Depreciation and amortization 51 47    
Reorganization costs 0      
Equity in earnings/(losses) of unconsolidated affiliates 0 0    
Income/(loss) from continuing operations before income taxes (40) (35)    
Income/(loss) from continuing operations (34) (29)    
Loss from discontinued operations, net of income tax   0    
Net Income/(Loss) (34) (29)    
Net income/(loss) attributable to NRG Energy, Inc. 1 (1)    
Total assets 5,191      
Includes other income - affiliate   0    
Renewables | Eliminations        
Segment Reporting Information        
Operating revenues (8) (8)    
NRG Yield | Operating Segments        
Segment Reporting Information        
Operating revenues 225 221    
Depreciation and amortization 81 77    
Reorganization costs 0      
Equity in earnings/(losses) of unconsolidated affiliates 4 19    
Income/(loss) from continuing operations before income taxes (1) (3)    
Income/(loss) from continuing operations 0 (2)    
Loss from discontinued operations, net of income tax   0    
Net Income/(Loss) 0 (2)    
Net income/(loss) attributable to NRG Energy, Inc. 21 12    
Total assets 8,362      
Includes other income - affiliate   0    
NRG Yield | Eliminations        
Segment Reporting Information        
Operating revenues 0 0    
Corporate | Operating Segments        
Segment Reporting Information        
Operating revenues 2 10    
Depreciation and amortization 8 8    
Reorganization costs 13      
Equity in earnings/(losses) of unconsolidated affiliates (1) 3    
Income/(loss) from continuing operations before income taxes (126) (137)    
Income/(loss) from continuing operations (132) (137)    
Loss from discontinued operations, net of income tax   (34)    
Net Income/(Loss) (132) (171)    
Net income/(loss) attributable to NRG Energy, Inc. (148) (171)    
Total assets 9,108      
Includes other income - affiliate   48    
Corporate | Eliminations        
Segment Reporting Information        
Operating revenues $ 2 $ (26)    
Buckthorn Renewables, LLC        
Segment Reporting Information        
Generation capacity (in MW) | MW     154  
Discontinued Operations, Held-for-sale or Disposed of by Sale | Buckthorn Renewables, LLC        
Segment Reporting Information        
Percentage of ownership sold     100.00%  
NRG Yield        
Segment Reporting Information        
Generation capacity (in MW) | MW       555