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Segment Reporting (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement                        
Operating revenues   $ 1,992 $ 2,960 $ 2,461 $ 2,065 $ 2,154 $ 2,618 $ 2,281 $ 2,021 $ 9,478 $ 9,074 $ 8,915
Operating expenses                   7,997 7,766 7,708
Depreciation and amortization                   421 596 756
Impairment losses                   99 1,534 483
Development costs                   11 22 48
Total operating costs and expenses                   8,528 9,918 8,995
Other income - affiliate $ 84                 0 87 193
Gain on sale of assets                   32 16 (80)
Gain on postretirement benefits curtailment                       (80)
Operating income/(loss)   49 398 174 361 (1,200) 275 214 (30) 982 (741) 33
Equity in earnings/(losses) of unconsolidated affiliates                   9 (14) (18)
Impairment losses on investments                   (15) (79) (268)
Other income/(expenses), net                   18 51 47
Loss on debt extinguishment                   (44) (49) (142)
Interest expense                   (483) (557) (583)
Income/(Loss) from Continuing Operations Before Income Taxes                   467 (1,389) (931)
Income tax expense/(benefit)                   7 (44) 25
Net Income/(Loss) from Continuing Operations   (93) 288 27 238 (1,390) 163 60 (178) 460 (1,345) (956)
(Loss)/income from discontinued operations, net of income tax   80 (336) 69 (5) (265) 0 (702) (25) (192) (992) 65
Net Income/(Loss)   (13) (48) 96 233 (1,655) 163 (642) (203) 268 (2,337) (891)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests   (2) $ 24 $ 24 $ (46) (120) $ (8) $ (16) $ (40) 0 (184) (117)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   268 (2,153) (774)
Balance sheet                        
Equity investments in affiliates 182 412       182       412 182  
Capital expenditures 250 388       250       388 250  
Goodwill 539 573       539       573 539  
Total assets 23,355 10,628       23,355       10,628 23,355  
Eliminations                        
Income Statement                        
Operating revenues                   (1,068) (923) (1,122)
Operating expenses                   (1,066) (925) (1,129)
Depreciation and amortization                   0 (3) (3)
Impairment losses                   0 0 0
Development costs                   (1) 0 0
Total operating costs and expenses                   (1,067) (928) (1,132)
Other income - affiliate                     0 0
Gain on sale of assets                   0 0  
Gain on postretirement benefits curtailment                       0
Operating income/(loss)                   (1) 5 10
Equity in earnings/(losses) of unconsolidated affiliates                   (5) (5) 0
Impairment losses on investments                   0 0 0
Other income/(expenses), net                   (1) 0 (2)
Loss on debt extinguishment                   0 0 0
Interest expense                   0 0 2
Income/(Loss) from Continuing Operations Before Income Taxes                   (7) 0 10
Income tax expense/(benefit)                   0 0 0
Net Income/(Loss) from Continuing Operations                   (7) 0 10
(Loss)/income from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   (7) 0 10
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                   (5) 0 (12)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   (2) 0 22
Balance sheet                        
Equity investments in affiliates (92) 0       (92)       0 (92)  
Capital expenditures 0 0       0       0 0  
Goodwill 0 0       0       0 0  
Total assets (5,792) (5,401)       (5,792)       (5,401) (5,792)  
Retail | Operating Segments                        
Income Statement                        
Operating revenues                   7,103 6,369 6,330
Operating expenses                   5,919 5,377 5,162
Depreciation and amortization                   116 110 114
Impairment losses                   1 8 1
Development costs                   1 3 4
Total operating costs and expenses                   6,037 5,498 5,281
Other income - affiliate                     0 0
Gain on sale of assets                   0 0  
Gain on postretirement benefits curtailment                       (1)
Operating income/(loss)                   1,066 871 1,048
Equity in earnings/(losses) of unconsolidated affiliates                   0 0 0
Impairment losses on investments                   0 0 0
Other income/(expenses), net                   0 0 (6)
Loss on debt extinguishment                   0 0 0
Interest expense                   (3) (6) 6
Income/(Loss) from Continuing Operations Before Income Taxes                   1,063 865 1,048
Income tax expense/(benefit)                   1 (8) 1
Net Income/(Loss) from Continuing Operations                   1,062 873 1,047
(Loss)/income from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   1,062 873 1,047
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                   1 1 0
Net Income/(Loss) Attributable to NRG Energy, Inc.                   1,061 872 1,047
Balance sheet                        
Equity investments in affiliates 0 0       0       0 0  
Capital expenditures 82 90       82       90 82  
Goodwill 374 408       374       408 374  
Total assets 2,655 3,291       2,655       3,291 2,655  
Retail | Eliminations                        
Income Statement                        
Operating revenues                   (9) (4) (16)
Generation | Operating Segments                        
Income Statement                        
Operating revenues                   3,432 3,615 3,633
Operating expenses                   3,019 3,071 3,322
Depreciation and amortization                   272 454 593
Impairment losses                   98 1,526 452
Development costs                   9 13 15
Total operating costs and expenses                   3,398 5,064 4,382
Other income - affiliate                     0 0
Gain on sale of assets                   2 15  
Gain on postretirement benefits curtailment                       0
Operating income/(loss)                   36 (1,434) (749)
Equity in earnings/(losses) of unconsolidated affiliates                   10 (14) (63)
Impairment losses on investments                   (15) (75) (248)
Other income/(expenses), net                   20 23 22
Loss on debt extinguishment                   0 0 0
Interest expense                   (58) (100) (96)
Income/(Loss) from Continuing Operations Before Income Taxes                   (7) (1,600) (1,134)
Income tax expense/(benefit)                   0 2 (1)
Net Income/(Loss) from Continuing Operations                   (7) (1,602) (1,133)
(Loss)/income from discontinued operations, net of income tax                   0 0 0
Net Income/(Loss)                   (7) (1,602) (1,133)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                   9 4 (1)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   (16) (1,606) (1,132)
Balance sheet                        
Equity investments in affiliates 179 412       179       412 179  
Capital expenditures 148 267       148       267 148  
Goodwill 165 165       165       165 165  
Total assets 9,090 5,735       9,090       5,735 9,090  
Generation | Eliminations                        
Income Statement                        
Operating revenues                   (1,085) (877) (999)
Corporate | Operating Segments                        
Income Statement                        
Operating revenues                   11 13 74
Operating expenses                   125 243 353
Depreciation and amortization                   33 35 52
Impairment losses                   0 0 30
Development costs                   2 6 29
Total operating costs and expenses                   160 284 464
Other income - affiliate                     87 193
Gain on sale of assets                   30 1  
Gain on postretirement benefits curtailment                       (79)
Operating income/(loss)                   (119) (183) (276)
Equity in earnings/(losses) of unconsolidated affiliates                   4 5 45
Impairment losses on investments                   0 (4) (20)
Other income/(expenses), net                   (1) 28 33
Loss on debt extinguishment                   (44) (49) (142)
Interest expense                   (422) (451) (495)
Income/(Loss) from Continuing Operations Before Income Taxes                   (582) (654) (855)
Income tax expense/(benefit)                   6 (38) 25
Net Income/(Loss) from Continuing Operations                   (588) (616) (880)
(Loss)/income from discontinued operations, net of income tax                   (192) (992) 65
Net Income/(Loss)                   (780) (1,608) (815)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                   (5) (189) (104)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   (775) (1,419) (711)
Balance sheet                        
Equity investments in affiliates 95 0       95       0 95  
Capital expenditures 20 31       20       31 20  
Goodwill 0 0       0       0 0  
Total assets $ 17,402 $ 7,003       $ 17,402       7,003 17,402  
Corporate | Eliminations                        
Income Statement                        
Operating revenues                   $ 26 $ (42) $ (107)
Customer Concentration Risk                        
Segment Reporting Information                        
Concentration Risk, Percentage                     0.00% 0.00%
Customer Concentration Risk | Generation                        
Segment Reporting Information                        
Concentration Risk, Percentage                   11.00%