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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 income/(loss)   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                   (1,706) (1,068) (923)
Operating expenses                   (1,705) (1,069) (925)
Depreciation and amortization                   0 0 (3)
Impairment losses                   0 0 0
Development costs                   0 (1) 0
Total operating costs and expenses                   (1,705) (1,070) (928)
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   0 0 0
Operating income/(loss)                   (1) 2 5
Equity in earnings/(losses) of unconsolidated affiliates                   0 (5) (5)
Impairment losses on investments                   0 0 0
Other income, net                   0 (1) 0
Loss on debt extinguishment                   0 0 0
Interest expense                   0 0 0
Income/(Loss) from Continuing Operations Before Income Taxes                   (1) (4) 0
Income tax (benefit)/expense                   0 0 0
Income/(Loss) from Continuing Operations                   (1) (4) 0
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   (1) (4) 0
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 (5) 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   (1) 1 0
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   0       0       0 0  
Goodwill   0       0       0 0  
Total assets   (5,040)       (5,404)       (5,040) (5,404)  
Retail | Operating Segments                        
Income Statement                        
Revenues                   7,680 7,103 6,369
Operating expenses                   7,031 5,919 5,377
Depreciation and amortization                   157 116 110
Impairment losses                   1 1 8
Development costs                   0 1 3
Total operating costs and expenses                   7,189 6,037 5,498
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   (1) 0 0
Operating income/(loss)                   490 1,066 871
Equity in earnings/(losses) of unconsolidated affiliates                   0 0 0
Impairment losses on investments                   0 0 0
Other income, net                   2 0 0
Loss on debt extinguishment                   0 0 0
Interest expense                   (3) (3) (6)
Income/(Loss) from Continuing Operations Before Income Taxes                   489 1,063 865
Income tax (benefit)/expense                   2 1 (8)
Income/(Loss) from Continuing Operations                   487 1,062 873
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   487 1,062 873
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   3 1 1
Net Income/(Loss) Attributable to NRG Energy, Inc.                   484 1,061 872
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   60       90       60 90  
Goodwill   414       408       414 408  
Total assets   3,573       3,291       3,573 3,291  
Retail | Eliminations                        
Income Statement                        
Revenues                   (10) (9) (4)
Generation | Operating Segments                        
Income Statement                        
Revenues                   3,847 3,443 3,615
Operating expenses                   2,777 3,021 3,071
Depreciation and amortization                   185 272 454
Impairment losses                   4 98 1,526
Development costs                   7 9 13
Total operating costs and expenses                   2,973 3,400 5,064
Other income - affiliate                       0
(Loss)/Gain on sale of assets                   2 2 15
Operating income/(loss)                   876 45 (1,434)
Equity in earnings/(losses) of unconsolidated affiliates                   2 10 (14)
Impairment losses on investments                   (101) (15) (75)
Other income, net                   32 20 23
Loss on debt extinguishment                   (3) 0 0
Interest expense                   (24) (58) (100)
Income/(Loss) from Continuing Operations Before Income Taxes                   782 2 (1,600)
Income tax (benefit)/expense                   2 0 2
Income/(Loss) from Continuing Operations                   780 2 (1,602)
Income/(loss) from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   780 2 (1,602)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 9 4
Net Income/(Loss) Attributable to NRG Energy, Inc.                   780 (7) (1,606)
Balance sheet                        
Equity investments in affiliates   388       412       388 412  
Capital expenditures   134       267       134 267  
Goodwill   165       165       165 165  
Total assets   5,467       5,735       5,467 5,735  
Generation | Eliminations                        
Income Statement                        
Revenues                   (1,602) (1,085) (877)
Corporate | Operating Segments                        
Income Statement                        
Revenues                   0 0 13
Operating expenses                   50 126 243
Depreciation and amortization                   31 33 35
Impairment losses                   0 0 0
Development costs                   0 2 6
Total operating costs and expenses                   81 161 284
Other income - affiliate                       87
(Loss)/Gain on sale of assets                   6 30 1
Operating income/(loss)                   (75) (131) (183)
Equity in earnings/(losses) of unconsolidated affiliates                   0 4 5
Impairment losses on investments                   (7) 0 (4)
Other income, net                   32 (1) 28
Loss on debt extinguishment                   (48) (44) (49)
Interest expense                   (386) (422) (451)
Income/(Loss) from Continuing Operations Before Income Taxes                   (484) (594) (654)
Income tax (benefit)/expense                   (3,338) 6 (38)
Income/(Loss) from Continuing Operations                   2,854 (600) (616)
Income/(loss) from discontinued operations, net of income tax                   321 (192) (992)
Net Income/(Loss)                   3,175 (792) (1,608)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests                   0 (5) (189)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   3,175 (787) (1,419)
Balance sheet                        
Equity investments in affiliates   0       0       0 0  
Capital expenditures   34       31       34 31  
Goodwill   0       0       0 0  
Total assets   $ 8,531       $ 7,006       8,531 7,006  
Corporate | Eliminations                        
Income Statement                        
Revenues                   $ (94) $ 26 $ (42)
Customer Concentration Risk | Generation                        
Segment Reporting Information                        
Concentration risk, percentage                   10.00% 11.00%