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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information          
Total operating revenues $ 3,061 $ 2,740 $ 7,795 $ 7,246  
Depreciation and amortization 112 163 370 490  
Impairment losses 0 0 74 60  
Reorganization costs 27 12 70 18  
Gain on sale of assets 14   30 4  
Equity in earnings of unconsolidated affiliates 20 9 26 (20)  
Loss on debt extinguishment, net (19) 0 (22) 0  
(Loss)/income from continuing operations before income taxes 313 186 620 119  
(Loss)/income from continuing operations 306 185 601 116  
Income/(Loss) from discontinued operations, net of income tax (354) (22) (320) (798)  
Net (Loss)/Income (48) 163 281 (682)  
(Loss)/Income attributable to NRG Energy, Inc. common stockholders (72) 171 280 (619)  
Total assets 11,450   11,450   $ 23,550
Eliminations          
Segment Reporting Information          
Total operating revenues (722) (509) (928) (924)  
Depreciation and amortization 2 (1) 0 (2)  
Impairment losses     0 0  
Reorganization costs 0 0 0 0  
Gain on sale of assets 0   0 0  
Equity in earnings of unconsolidated affiliates (2) (3) (5) (5)  
Loss on debt extinguishment, net 0   0    
(Loss)/income from continuing operations before income taxes (504) (1) (1,228) (4)  
(Loss)/income from continuing operations (504) (1) (1,228) (4)  
Income/(Loss) from discontinued operations, net of income tax 0 0 0 0  
Net (Loss)/Income (504) (1) (1,228) (4)  
(Loss)/Income attributable to NRG Energy, Inc. common stockholders (501) 2 (1,224) 1  
Total assets (6,693)   (6,693)    
Retail | Operating Segments          
Segment Reporting Information          
Total operating revenues 2,203 1,936 5,497 4,868  
Depreciation and amortization 30 28 86 81  
Impairment losses     0 0  
Reorganization costs 6 5 10 5  
Gain on sale of assets 0   0 0  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Loss on debt extinguishment, net 0   0    
(Loss)/income from continuing operations before income taxes (127) 72 733 371  
(Loss)/income from continuing operations (127) 72 733 380  
Income/(Loss) from discontinued operations, net of income tax 0 0 0 0  
Net (Loss)/Income (127) 72 733 380  
(Loss)/Income attributable to NRG Energy, Inc. common stockholders (127) 72 732 380  
Total assets 3,465   3,465    
Retail | Eliminations          
Segment Reporting Information          
Total operating revenues (1) (3) (7) (3)  
Generation | Operating Segments          
Segment Reporting Information          
Total operating revenues 1,579 1,313 3,216 3,289  
Depreciation and amortization 73 128 259 385  
Impairment losses     74 60  
Reorganization costs 3 3 10 3  
Gain on sale of assets 0   1 4  
Equity in earnings of unconsolidated affiliates 20 9 27 (21)  
Loss on debt extinguishment, net 0   0    
(Loss)/income from continuing operations before income taxes 595 272 303 185  
(Loss)/income from continuing operations 595 272 302 183  
Income/(Loss) from discontinued operations, net of income tax 0 0 0 0  
Net (Loss)/Income 595 272 302 183  
(Loss)/Income attributable to NRG Energy, Inc. common stockholders 579 256 293 169  
Total assets 6,699   6,699    
Generation | Eliminations          
Segment Reporting Information          
Total operating revenues (740) (493) (944) (872)  
Corporate | Operating Segments          
Segment Reporting Information          
Total operating revenues 1 0 10 13  
Depreciation and amortization 7 8 25 26  
Impairment losses     0 0  
Reorganization costs 18 4 50 10  
Gain on sale of assets 14   29 0  
Equity in earnings of unconsolidated affiliates 2 3 4 6  
Loss on debt extinguishment, net (19)   (22)    
(Loss)/income from continuing operations before income taxes 349 (157) 812 (433)  
(Loss)/income from continuing operations 342 (158) 794 (443)  
Income/(Loss) from discontinued operations, net of income tax (354) (22) (320) (798)  
Net (Loss)/Income (12) (180) 474 (1,241)  
(Loss)/Income attributable to NRG Energy, Inc. common stockholders (23) (159) 479 (1,169)  
Total assets 7,979   7,979    
Corporate | Eliminations          
Segment Reporting Information          
Total operating revenues $ 19 $ (13) $ 23 $ (49)