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Segment Reporting (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement                        
Revenues   $ 2,195 $ 2,996 $ 2,465 $ 2,165 $ 1,992 $ 2,960 $ 2,461 $ 2,065 $ 9,821 $ 9,478 $ 9,074
Operating expenses                   8,153 7,997 7,766
Depreciation and amortization                   373 421 596
Impairment losses                   5 99 1,534
Development costs                   7 11 22
Total operating costs and expenses                   8,538 8,528 9,918
Other income - affiliate $ 84                 0 0 87
(Loss)/Gain on sale of assets                   7 32 16
Operating (loss)/income   209 540 320 221 49 398 174 361 1,290 982 (741)
Equity in earnings/(losses) of unconsolidated affiliates                   2 9 (14)
Impairment losses on investments                   (108) (15) (79)
Other income, net                   66 18 51
Loss on debt extinguishment                   (51) (44) (49)
Interest expense                   (413) (483) (557)
Income/(Loss) from Continuing Operations Before Income Taxes                   786 467 (1,389)
Income tax (benefit)/expense                   (3,334) 7 (44)
Income/(Loss) from Continuing Operations   3,463 374 189 94 (93) 287 27 238 4,120 460 (1,345)
Income/(loss) from discontinued operations, net of income tax   (78) (2) 13 388 80 (336) 69 (5) 321 (192) (992)
Net Income/(Loss)   3,385 372 202 482 (13) (49) 96 233 4,441 268 (2,337)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests   2 $ 0 $ 1 $ 0 (2) $ 23 $ 24 $ (46) 3 0 (184)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   4,438 268 (2,153)
Balance sheet                        
Equity investments in affiliates   388       412       388 412  
Capital expenditures   228       388       228 388  
Goodwill   579       573       579 573  
Total assets   12,531       10,628       12,531 10,628  
Eliminations                        
Income Statement                        
Revenues                   (7) (18) (47)
Operating expenses                   (7) (18) (48)
Depreciation and amortization                   0 0 (3)
Impairment losses                   0 0 0
Development costs                   0 0 0
Total operating costs and expenses                   (7) (18) (51)
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 0 0
Operating (loss)/income                   0 0 4
Equity in earnings/(losses) 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/(Loss) from Continuing Operations Before Income Taxes                   0 0 4
Income tax (benefit)/expense                   0 0 0
Income/(Loss) from Continuing Operations                   0 0 4
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   0 0 4
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 0 4
Net Income/(Loss) Attributable to NRG Energy, Inc.                   0 0 0
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   0       0       0 0  
Goodwill   0       0       0 0  
Total assets   (4,872)       (5,095)       (4,872) (5,095)  
Texas | Operating Segments                        
Income Statement                        
Revenues                   7,069 6,401 6,318
Operating expenses                   5,818 5,399 5,393
Depreciation and amortization                   188 156 258
Impairment losses                   1 5 1,317
Development costs                   3 3 4
Total operating costs and expenses                   6,010 5,563 6,972
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 4 5
Operating (loss)/income                   1,059 842 (649)
Equity in earnings/(losses) of unconsolidated affiliates                   (4) (3) (22)
Impairment losses on investments                   (103) (15) (69)
Other income, net                   20 13 (2)
Loss on debt extinguishment                   0 0 0
Interest expense                   0 0 0
Income/(Loss) from Continuing Operations Before Income Taxes                   972 837 (742)
Income tax (benefit)/expense                   0 0 0
Income/(Loss) from Continuing Operations                   972 837 (742)
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   972 837 (742)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 0 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   972 837 (742)
Balance sheet                        
Equity investments in affiliates   6       6       6 6  
Capital expenditures   136       143       136 143  
Goodwill   325       320       325 320  
Total assets   5,711       5,357       5,711 5,357  
Texas | Eliminations                        
Income Statement                        
Revenues                   (1) (19) (41)
East | Operating Segments                        
Income Statement                        
Revenues                   2,319 2,371 2,009
Operating expenses                   1,895 2,024 1,684
Depreciation and amortization                   121 105 112
Impairment losses                   0 82 106
Development costs                   3 3 6
Total operating costs and expenses                   2,019 2,214 1,908
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   1 0 15
Operating (loss)/income                   301 157 116
Equity in earnings/(losses) of unconsolidated affiliates                   0 0 0
Impairment losses on investments                   0 0 0
Other income, net                   6 2 4
Loss on debt extinguishment                   0 0 0
Interest expense                   (18) (22) (29)
Income/(Loss) from Continuing Operations Before Income Taxes                   289 137 91
Income tax (benefit)/expense                   2 1 0
Income/(Loss) from Continuing Operations                   287 136 91
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   287 136 91
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 0 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   287 136 91
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   30       171       30 171  
Goodwill   254       253       254 253  
Total assets   2,160       2,187       2,160 2,187  
East | Eliminations                        
Income Statement                        
Revenues                   (8) 5 (1)
West/Other | Operating Segments                        
Income Statement                        
Revenues                   440 724 788
Operating expenses                   397 467 498
Depreciation and amortization                   33 127 194
Impairment losses                   4 12 111
Development costs                   1 3 6
Total operating costs and expenses                   435 609 809
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 (2) (5)
Operating (loss)/income                   5 113 (26)
Equity in earnings/(losses) of unconsolidated affiliates                   6 13 10
Impairment losses on investments                   0 0 (6)
Other income, net                   10 4 22
Loss on debt extinguishment                   (3) 0 0
Interest expense                   (10) (39) (77)
Income/(Loss) from Continuing Operations Before Income Taxes                   8 91 (77)
Income tax (benefit)/expense                   1 0 (6)
Income/(Loss) from Continuing Operations                   7 91 (71)
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   7 91 (71)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   3 5 1
Net Income/(Loss) Attributable to NRG Energy, Inc.                   4 86 (72)
Balance sheet                        
Equity investments in affiliates   382       406       382 406  
Capital expenditures   25       29       25 29  
Goodwill   0       0       0 0  
Total assets   1,190       1,548       1,190 1,548  
West/Other | Eliminations                        
Income Statement                        
Revenues                   2 (4) 4
Corporate | Operating Segments                        
Income Statement                        
Revenues                   0 0 6
Operating expenses                   50 125 239
Depreciation and amortization                   31 33 35
Impairment losses                   0 0 0
Development costs                   0 2 6
Total operating costs and expenses                   81 160 280
Other income - affiliate                       87
(Loss)/Gain on sale of assets                   6 30 1
Operating (loss)/income                   (75) (130) (186)
Equity in earnings/(losses) of unconsolidated affiliates                   0 (1) (2)
Impairment losses on investments                   (5) 0 (4)
Other income, net                   30 (1) 27
Loss on debt extinguishment                   (48) (44) (49)
Interest expense                   (385) (422) (451)
Income/(Loss) from Continuing Operations Before Income Taxes                   (483) (598) (665)
Income tax (benefit)/expense                   (3,337) 6 (38)
Income/(Loss) from Continuing Operations                   2,854 (604) (627)
Income/(loss) from discontinued operations, net of income tax                   321 (192) (992)
Net Income/(Loss)                   3,175 (796) (1,619)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 (5) (189)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   3,175 (791) (1,430)
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   37       45       37 45  
Goodwill   0       0       0 0  
Total assets   $ 8,342       $ 6,631       8,342 6,631  
Corporate | Eliminations                        
Income Statement                        
Revenues                   $ 0 $ 0 $ (9)
Customer Concentration Risk | Texas                        
Segment Reporting Information                        
Concentration risk, percentage                   10.00% 11.00%