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Segment Reporting (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement      
Revenues $ 9,093 $ 9,821 $ 9,478
Operating expenses 7,473 8,153 7,997
Depreciation and amortization 435 373 421
Impairment losses 75 5 99
Development costs 8 7 11
Total operating cost and expenses 7,991 8,538 8,528
(Loss)/gain on sale of assets 3 7 32
Operating income/(loss) 1,105 1,290 982
Equity in (losses)/earnings of unconsolidated affiliates 17 2 9
Impairment losses on investments (18) (108) (15)
Other income, net 67 66 18
Loss on debt extinguishment (9) (51) (44)
Interest expense (401) (413) (483)
Income from Continuing Operations Before Income Taxes 761 786 467
Income tax expense/(benefit) 251 (3,334) 7
Income from Continuing Operations 510 4,120 460
Income/(loss) from discontinued operations, net of income tax 0 321 (192)
Net Income 510 4,441 268
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests 0 3 0
Net Income Attributable to NRG Energy, Inc. 510 4,438 268
Balance sheet      
Equity investments in affiliates 346 388  
Capital expenditures 230 228  
Goodwill 579 579  
Total assets 14,902 12,531  
Corporate      
Income Statement      
Revenues 0    
Operating expenses 57    
Depreciation and amortization 34    
Impairment losses 0    
Development costs 0    
Total operating cost and expenses 91    
(Loss)/gain on sale of assets 5    
Operating income/(loss) (86)    
Equity in (losses)/earnings of unconsolidated affiliates 0    
Impairment losses on investments 0    
Other income, net 41    
Loss on debt extinguishment 0    
Interest expense (384)    
Income from Continuing Operations Before Income Taxes (429)    
Income tax expense/(benefit) 250    
Net Income Attributable to NRG Energy, Inc. (679)    
Balance sheet      
Equity investments in affiliates 0    
Capital expenditures 25    
Goodwill 0    
Total assets 11,152    
Eliminations      
Income Statement      
Revenues (4) (7) (18)
Operating expenses (4) (7) (18)
Depreciation and amortization 0 0 0
Impairment losses 0 0 0
Development costs 0 0 0
Total operating cost and expenses (4) (7) (18)
(Loss)/gain on sale of assets 0 0 0
Operating income/(loss) 0 0 0
Equity in (losses)/earnings of unconsolidated affiliates 0 0 0
Impairment losses on investments 0 0 0
Other income, net 0 0 0
Loss on debt extinguishment 0 0 0
Interest expense 0 0 0
Income from Continuing Operations Before Income Taxes 0 0 0
Income tax expense/(benefit) 0 0 0
Income from Continuing Operations   0 0
Income/(loss) from discontinued operations, net of income tax   0 0
Net Income   0 0
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   0 0
Net Income Attributable to NRG Energy, Inc. 0 0 0
Balance sheet      
Equity investments in affiliates 0 0  
Capital expenditures 0 0  
Goodwill 0 0  
Total assets (7,360) (4,872)  
Texas | Operating Segments      
Income Statement      
Revenues 6,309 7,069 6,401
Operating expenses 5,246 5,818 5,399
Depreciation and amortization 227 188 156
Impairment losses 14 1 5
Development costs 4 3 3
Total operating cost and expenses 5,491 6,010 5,563
(Loss)/gain on sale of assets 0 0 4
Operating income/(loss) 818 1,059 842
Equity in (losses)/earnings of unconsolidated affiliates (12) (4) (3)
Impairment losses on investments (18) (103) (15)
Other income, net 11 20 13
Loss on debt extinguishment 0 0 0
Interest expense 0 0 0
Income from Continuing Operations Before Income Taxes 799 972 837
Income tax expense/(benefit) 0 0 0
Income from Continuing Operations   972 837
Income/(loss) from discontinued operations, net of income tax   0 0
Net Income   972 837
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   0 0
Net Income Attributable to NRG Energy, Inc. 799 972 837
Balance sheet      
Equity investments in affiliates (13) 6  
Capital expenditures 130 136  
Goodwill 325 325  
Total assets 7,641 5,711  
Texas | Eliminations      
Income Statement      
Revenues (6) (1) (19)
East | Operating Segments      
Income Statement      
Revenues 2,354 2,319 2,371
Operating expenses 1,828 1,895 2,024
Depreciation and amortization 142 121 105
Impairment losses 0 0 82
Development costs 3 3 3
Total operating cost and expenses 1,973 2,019 2,214
(Loss)/gain on sale of assets 0 1 0
Operating income/(loss) 381 301 157
Equity in (losses)/earnings of unconsolidated affiliates 0 0 0
Impairment losses on investments 0 0 0
Other income, net 7 6 2
Loss on debt extinguishment (4) 0 0
Interest expense (14) (18) (22)
Income from Continuing Operations Before Income Taxes 370 289 137
Income tax expense/(benefit) (1) 2 1
Income from Continuing Operations   287 136
Income/(loss) from discontinued operations, net of income tax   0 0
Net Income   287 136
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   0 0
Net Income Attributable to NRG Energy, Inc. 371 287 136
Balance sheet      
Equity investments in affiliates 0 0  
Capital expenditures 45 30  
Goodwill 254 254  
Total assets 1,885 2,160  
East | Eliminations      
Income Statement      
Revenues 6 (8) 5
West/Other | Operating Segments      
Income Statement      
Revenues 434 440 724
Operating expenses 346 397 467
Depreciation and amortization 32 33 127
Impairment losses 61 4 12
Development costs 1 1 3
Total operating cost and expenses 440 435 609
(Loss)/gain on sale of assets (2) 0 (2)
Operating income/(loss) (8) 5 113
Equity in (losses)/earnings of unconsolidated affiliates 29 6 13
Impairment losses on investments 0 0 0
Other income, net 8 10 4
Loss on debt extinguishment (5) (3) 0
Interest expense (3) (10) (39)
Income from Continuing Operations Before Income Taxes 21 8 91
Income tax expense/(benefit) 2 1 0
Income from Continuing Operations   7 91
Income/(loss) from discontinued operations, net of income tax   0 0
Net Income   7 91
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   3 5
Net Income Attributable to NRG Energy, Inc. 19 4 86
Balance sheet      
Equity investments in affiliates 359 382  
Capital expenditures 30 25  
Goodwill 0 0  
Total assets 1,584 1,190  
West/Other | Eliminations      
Income Statement      
Revenues $ (4) 2 (4)
Corporate | Operating Segments      
Income Statement      
Revenues   0 0
Operating expenses   50 125
Depreciation and amortization   31 33
Impairment losses   0 0
Development costs   0 2
Total operating cost and expenses   81 160
(Loss)/gain on sale of assets   6 30
Operating income/(loss)   (75) (130)
Equity in (losses)/earnings of unconsolidated affiliates   0 (1)
Impairment losses on investments   (5) 0
Other income, net   30 (1)
Loss on debt extinguishment   (48) (44)
Interest expense   (385) (422)
Income from Continuing Operations Before Income Taxes   (483) (598)
Income tax expense/(benefit)   (3,337) 6
Income from Continuing Operations   2,854 (604)
Income/(loss) from discontinued operations, net of income tax   321 (192)
Net Income   3,175 (796)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   0 (5)
Net Income Attributable to NRG Energy, Inc.   3,175 $ (791)
Balance sheet      
Equity investments in affiliates   0  
Capital expenditures   37  
Goodwill   0  
Total assets   $ 8,342  
Customer Concentration Risk | Texas      
Segment Reporting Information      
Concentration risk, percentage 10.00%   11.00%