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Segment Reporting (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
MW
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
MW
Jun. 30, 2017
USD ($)
Mar. 30, 2018
MW
Dec. 31, 2017
USD ($)
MW
Segment Reporting Information            
Generation capacity (in MW) | MW 30,000   30,000      
Operating revenues $ 2,922 $ 2,701 $ 5,343 $ 5,083    
Depreciation and amortization 227 260 462 517    
Impairment losses 74 63 74 63    
Reorganization costs 23 0 43 0    
Equity in earnings/(losses) of unconsolidated affiliates 18 (3) 16 2    
(Loss)/income from continuing operations before income taxes 129 103 361 (71)    
(Loss)/income from continuing operations 121 99 354 (70)    
Loss from discontinued operations, net of income tax (25) (741) (25) (775)    
Net Income/(Loss) 96 (642) 329 (845)    
Net income/(loss) attributable to NRG Energy, Inc. 72 (626) 351 (790)    
Total assets 22,947   22,947     $ 23,318
Eliminations            
Segment Reporting Information            
Operating revenues (540) (194) (240) (436)    
Depreciation and amortization 0 0 0 0    
Impairment losses 0 0 0 0    
Reorganization costs 0   0      
Equity in earnings/(losses) of unconsolidated affiliates (16) (5) (23) (9)    
(Loss)/income from continuing operations before income taxes (12) (5) (22) (9)    
(Loss)/income from continuing operations (12) (5) (22) (9)    
Loss from discontinued operations, net of income tax 0 0 0 0    
Net Income/(Loss) (12) (5) (22) (9)    
Net income/(loss) attributable to NRG Energy, Inc. 94 25 96 18    
Total assets (10,816)   (10,816)      
Retail | Operating Segments            
Segment Reporting Information            
Operating revenues 1,817 1,603 3,298 2,938    
Depreciation and amortization 31 29 59 57    
Impairment losses 0 0 0 0    
Reorganization costs 1   4      
Equity in earnings/(losses) of unconsolidated affiliates 0 0 0 0    
(Loss)/income from continuing operations before income taxes (84) 330 861 303    
(Loss)/income from continuing operations (84) 341 861 311    
Loss from discontinued operations, net of income tax 0 0 0 0    
Net Income/(Loss) (84) 341 861 311    
Net income/(loss) attributable to NRG Energy, Inc. (88) 341 851 311    
Total assets 7,217   7,217      
Retail | Eliminations            
Segment Reporting Information            
Operating revenues (2) (1) (3) (11)    
Generation | Operating Segments            
Segment Reporting Information            
Operating revenues 1,218 882 1,545 1,848    
Depreciation and amortization 66 95 133 192    
Impairment losses 74 41 74 41    
Reorganization costs 3   7      
Equity in earnings/(losses) of unconsolidated affiliates 0 (15) 2 (28)    
(Loss)/income from continuing operations before income taxes 273 (89) (264) (52)    
(Loss)/income from continuing operations 272 (90) (265) (54)    
Loss from discontinued operations, net of income tax 0 0 0 0    
Net Income/(Loss) 272 (90) (265) (54)    
Net income/(loss) attributable to NRG Energy, Inc. 272 (90) (265) (54)    
Total assets 4,306   4,306      
Generation | Eliminations            
Segment Reporting Information            
Operating revenues (546) (171) (239) (406)    
Renewables            
Segment Reporting Information            
Impairment losses   22        
Renewables | Operating Segments            
Segment Reporting Information            
Operating revenues 113 119 199 213    
Depreciation and amortization 40 49 90 96    
Impairment losses 0 22 0 22    
Reorganization costs 3   3      
Equity in earnings/(losses) of unconsolidated affiliates 5 (2) 5 (3)    
(Loss)/income from continuing operations before income taxes (17) (51) (56) (87)    
(Loss)/income from continuing operations (12) (46) (45) (77)    
Loss from discontinued operations, net of income tax 0 0 0 0    
Net Income/(Loss) (12) (46) (45) (77)    
Net income/(loss) attributable to NRG Energy, Inc. (35) (21) (33) (24)    
Total assets 4,117   4,117      
Renewables | Eliminations            
Segment Reporting Information            
Operating revenues (9) (3) (17) (4)    
NRG Yield | Operating Segments            
Segment Reporting Information            
Operating revenues 307 288 532 509    
Depreciation and amortization 82 79 163 156    
Impairment losses 0 0 0 0    
Reorganization costs 0   0      
Equity in earnings/(losses) of unconsolidated affiliates 29 16 33 35    
(Loss)/income from continuing operations before income taxes 103 52 102 49    
(Loss)/income from continuing operations 96 44 96 42    
Loss from discontinued operations, net of income tax 0 0 0 0    
Net Income/(Loss) 96 44 96 42    
Net income/(loss) attributable to NRG Energy, Inc. 73 38 94 50    
Total assets 8,448   8,448      
NRG Yield | Eliminations            
Segment Reporting Information            
Operating revenues 0 0 0 0    
Corporate | Operating Segments            
Segment Reporting Information            
Operating revenues 7 3 9 11    
Depreciation and amortization 8 8 17 16    
Impairment losses 0 0 0 0    
Reorganization costs 16   29      
Equity in earnings/(losses) of unconsolidated affiliates 0 3 (1) 7    
(Loss)/income from continuing operations before income taxes (134) (134) (260) (275)    
(Loss)/income from continuing operations (139) (145) (271) (283)    
Loss from discontinued operations, net of income tax (25) (741) (25) (775)    
Net Income/(Loss) (164) (886) (296) (1,058)    
Net income/(loss) attributable to NRG Energy, Inc. (244) (919) (392) (1,091)    
Total assets 9,675   9,675      
Corporate | Eliminations            
Segment Reporting Information            
Operating revenues $ 17 $ (19) $ 19 $ (15)    
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