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Condensed Consolidating Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Revenues    
Total operating revenues $ 2,421 $ 2,382
Operating Costs and Expenses    
Cost of operations 1,558 1,862
Depreciation and amortization 235 257
Selling, general and administrative 191 260
Reorganization costs 20 0
Development costs 13 17
Total operating costs and expenses 2,017 2,396
Other income - affiliate 0 48
Gain on sale of assets 2 2
Operating Income/(Loss) 406 36
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 0 0
Equity in (losses)/earnings of unconsolidated affiliates (2) 5
Other income/(expense), net (3) 13
Loss on debt extinguishment, net (2) (2)
Interest expense (167) (225)
Total other expense (174) (209)
Income/(Loss) from Continuing Operations Before Income Taxes 232 (173)
Income tax expense/(benefit) (1) (4)
Income/(Loss) from Continuing Operations 233 (169)
Loss from discontinued operations, net of income tax 0 (34)
Net Income/(Loss) 233 (203)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests (46) (40)
Net Income Attributable to NRG Energy, Inc. 279 (163)
Eliminations    
Operating Revenues    
Total operating revenues 53 (84)
Operating Costs and Expenses    
Cost of operations 53 (80)
Depreciation and amortization 0 0
Selling, general and administrative 0 0
Reorganization costs 0  
Development costs 0 0
Total operating costs and expenses 53 (80)
Other income - affiliate   0
Gain on sale of assets 0 0
Operating Income/(Loss) 0 (4)
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries (540) (27)
Equity in (losses)/earnings of unconsolidated affiliates 0 0
Other income/(expense), net (16) 3
Loss on debt extinguishment, net 0 0
Interest expense 0
Total other expense (556) (24)
Income/(Loss) from Continuing Operations Before Income Taxes (556) (28)
Income tax expense/(benefit) 0 (2)
Income/(Loss) from Continuing Operations   (26)
Loss from discontinued operations, net of income tax   0
Net Income/(Loss) (556) (26)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests (16) 1
Net Income Attributable to NRG Energy, Inc. (540) (27)
Guarantor Subsidiaries    
Operating Revenues    
Total operating revenues 1,483 1,599
Operating Costs and Expenses    
Cost of operations 1,082 1,260
Depreciation and amortization 73 99
Selling, general and administrative 98 96
Reorganization costs 2  
Development costs 0 0
Total operating costs and expenses 1,255 1,455
Other income - affiliate   0
Gain on sale of assets 3 2
Operating Income/(Loss) 231 146
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 210 (42)
Equity in (losses)/earnings of unconsolidated affiliates 0 (1)
Other income/(expense), net 21 (2)
Loss on debt extinguishment, net 0 0
Interest expense (3) (4)
Total other expense 228 (49)
Income/(Loss) from Continuing Operations Before Income Taxes 459 97
Income tax expense/(benefit) 113 19
Income/(Loss) from Continuing Operations   78
Loss from discontinued operations, net of income tax   0
Net Income/(Loss) 346 78
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 0 0
Net Income Attributable to NRG Energy, Inc. 346 78
Non-Guarantor Subsidiaries    
Operating Revenues    
Total operating revenues 885 867
Operating Costs and Expenses    
Cost of operations 409 664
Depreciation and amortization 154 150
Selling, general and administrative 32 46
Reorganization costs 0  
Development costs 9 12
Total operating costs and expenses 604 872
Other income - affiliate   0
Gain on sale of assets (1) 0
Operating Income/(Loss) 280 (5)
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 0 1
Equity in (losses)/earnings of unconsolidated affiliates (1) 7
Other income/(expense), net (11) 5
Loss on debt extinguishment, net 0 (2)
Interest expense (72) (104)
Total other expense (84) (93)
Income/(Loss) from Continuing Operations Before Income Taxes 196 (98)
Income tax expense/(benefit) 48 (46)
Income/(Loss) from Continuing Operations   (52)
Loss from discontinued operations, net of income tax   (37)
Net Income/(Loss) 148 (89)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests (46) (38)
Net Income Attributable to NRG Energy, Inc. 194 (51)
NRG Energy, Inc. (Note Issuer)    
Operating Revenues    
Total operating revenues 0 0
Operating Costs and Expenses    
Cost of operations 14 18
Depreciation and amortization 8 8
Selling, general and administrative 61 118
Reorganization costs 18  
Development costs 4 5
Total operating costs and expenses 105 149
Other income - affiliate   48
Gain on sale of assets 0 0
Operating Income/(Loss) (105) (101)
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 330 68
Equity in (losses)/earnings of unconsolidated affiliates (1) (1)
Other income/(expense), net 3 7
Loss on debt extinguishment, net (2) 0
Interest expense (92) (117)
Total other expense 238 (43)
Income/(Loss) from Continuing Operations Before Income Taxes 133 (144)
Income tax expense/(benefit) (162) 25
Income/(Loss) from Continuing Operations   (169)
Loss from discontinued operations, net of income tax   3
Net Income/(Loss) 295 (166)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 16 (3)
Net Income Attributable to NRG Energy, Inc. $ 279 $ (163)