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Condensed Consolidating Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating Revenues        
Total operating revenues $ 3,061 $ 2,740 $ 7,795 $ 7,246
Operating Costs and Expenses        
Cost of operations 2,307 2,072 5,730 5,589
Depreciation and amortization 112 163 370 490
Impairment losses 0 0 74 60
Selling, general and administrative 212 190 591 634
Reorganization costs 27 12 70 18
Development costs 1 6 9 18
Total operating costs and expenses 2,659 2,443 6,844 6,809
Other income - affiliate 0 0 0 87
Gain on sale of assets 14 0 30 4
Operating Income/(Loss) 416 297 981 528
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 0 0 0 0
Equity in earnings/(losses) of unconsolidated affiliates 20 9 26 (20)
Other income/(expense), net 17 19 (4) 43
Loss on debt extinguishment, net (19) 0 (22) 0
Interest expense (121) (139) (361) (432)
Total other income/(expense) (103) (111) (361) (409)
Income from Continuing Operations Before Income Taxes 313 186 620 119
Income tax expense/(benefit) 7 1 19 3
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)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 24 (8) 1 (63)
Net (Loss)/Income Attributable to NRG Energy, Inc. common stockholders (72) 171 280 (619)
Eliminations        
Operating Revenues        
Total operating revenues (2) (12) (13) (37)
Operating Costs and Expenses        
Cost of operations (2) (11) (13) (36)
Depreciation and amortization 0 0 0 0
Impairment losses 0   0 0
Selling, general and administrative (73) (1) (74) (1)
Reorganization costs 0 0 0  
Development costs 0 0 (1) 0
Total operating costs and expenses (75) (12) (88) (37)
Other income - affiliate       0
Gain on sale of assets 0   0 0
Operating Income/(Loss) 73 0 75 0
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries (472) (466) (1,170) (758)
Equity in earnings/(losses) of unconsolidated affiliates 0 0 0 0
Other income/(expense), net 0 (34) 0 (69)
Loss on debt extinguishment, net 0   0  
Interest expense 0 0 0 0
Total other income/(expense) (472) (500) (1,170) (827)
Income from Continuing Operations Before Income Taxes (399) (500) (1,095) (827)
Income tax expense/(benefit) 0 0 0 0
Income from Continuing Operations (399) (500) (1,095) (827)
Income/(Loss) from discontinued operations, net of income tax 0 0 0 0
Net (Loss)/Income (399) (500) (1,095) (827)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 73 (34) 75 (69)
Net (Loss)/Income Attributable to NRG Energy, Inc. common stockholders (472) (466) (1,170) (758)
Guarantor Subsidiaries        
Operating Revenues        
Total operating revenues 2,618 2,366 6,736 6,241
Operating Costs and Expenses        
Cost of operations 2,005 1,826 5,006 4,872
Depreciation and amortization 67 100 216 299
Impairment losses 0   0 42
Selling, general and administrative 125 106 337 309
Reorganization costs 0 2 4  
Development costs 0 0 0 0
Total operating costs and expenses 2,197 2,034 5,563 5,524
Other income - affiliate       0
Gain on sale of assets 0   3 4
Operating Income/(Loss) 421 332 1,176 721
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 6 7 14 20
Equity in earnings/(losses) of unconsolidated affiliates 0 0 0 0
Other income/(expense), net 4 7 13 7
Loss on debt extinguishment, net 0   0  
Interest expense (3) (4) (11) (11)
Total other income/(expense) 7 10 16 16
Income from Continuing Operations Before Income Taxes 428 342 1,192 737
Income tax expense/(benefit) 122 0 343 0
Income from Continuing Operations 306 342 849 737
Income/(Loss) from discontinued operations, net of income tax 0 0 0 0
Net (Loss)/Income 306 342 849 737
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 0 0 0 0
Net (Loss)/Income Attributable to NRG Energy, Inc. common stockholders 306 342 849 737
Non-Guarantor Subsidiaries        
Operating Revenues        
Total operating revenues 445 386 1,072 1,042
Operating Costs and Expenses        
Cost of operations 295 239 719 697
Depreciation and amortization 36 55 129 167
Impairment losses 0   74 18
Selling, general and administrative 21 16 46 55
Reorganization costs 0 (7) 0  
Development costs (2) 1 0 4
Total operating costs and expenses 350 304 968 940
Other income - affiliate       0
Gain on sale of assets 14   27 0
Operating Income/(Loss) 109 82 131 102
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 0 0 0 0
Equity in earnings/(losses) of unconsolidated affiliates 20 10 27 (17)
Other income/(expense), net 8 38 (27) 82
Loss on debt extinguishment, net   0  
Interest expense (8) (21) (42) (68)
Total other income/(expense) 20 27 (42) (3)
Income from Continuing Operations Before Income Taxes 129 109 89 99
Income tax expense/(benefit) 41 0 26 (7)
Income from Continuing Operations 88 109 63 106
Income/(Loss) from discontinued operations, net of income tax 17 12 77 (134)
Net (Loss)/Income 105 121 140 (28)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests (61) (3) (181) (49)
Net (Loss)/Income Attributable to NRG Energy, Inc. common stockholders 166 124 321 21
NRG Energy, Inc. (Note Issuer)        
Operating Revenues        
Total operating revenues 0 0 0 0
Operating Costs and Expenses        
Cost of operations 9 18 18 56
Depreciation and amortization 9 8 25 24
Impairment losses 0   0 0
Selling, general and administrative 139 69 282 271
Reorganization costs 27 17 66  
Development costs 3 5 10 14
Total operating costs and expenses 187 117 401 382
Other income - affiliate       87
Gain on sale of assets 0   0 0
Operating Income/(Loss) (187) (117) (401) (295)
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 466 459 1,156 738
Equity in earnings/(losses) of unconsolidated affiliates 0 (1) (1) (3)
Other income/(expense), net 5 8 10 23
Loss on debt extinguishment, net (19)   (22)  
Interest expense (110) (114) (308) (353)
Total other income/(expense) 342 352 835 405
Income from Continuing Operations Before Income Taxes 155 235 434 110
Income tax expense/(benefit) (156) 1 (350) 10
Income from Continuing Operations 311 234 784 100
Income/(Loss) from discontinued operations, net of income tax (371) (34) (397) (664)
Net (Loss)/Income (60) 200 387 (564)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 12 29 107 55
Net (Loss)/Income Attributable to NRG Energy, Inc. common stockholders $ (72) $ 171 $ 280 $ (619)