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Condensed Consolidating Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Revenues        
Total operating revenues $ 2,922 $ 2,701 $ 5,343 $ 5,083
Operating Costs and Expenses        
Cost of operations 2,051 1,841 3,609 3,704
Depreciation and amortization 227 260 462 517
Impairment losses 74 63 74 63
Selling, general and administrative 211 221 402 481
Reorganization costs 23 0 43 0
Development costs 16 18 29 35
Total operating costs and expenses 2,602 2,403 4,619 4,800
Other income - affiliate 0 39 0 87
Gain on sale of assets 14 2 16 4
Operating Income/(Loss) 334 339 740 374
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 0 0 0 0
Equity in earnings/(losses) of unconsolidated affiliates 18 (3) 16 2
Other income/(expense), net (20) 14 (23) 26
Loss on debt extinguishment, net (1) 0 (3) (2)
Interest expense (202) (247) (369) (471)
Total other expense (205) (236) (379) (445)
Income/(Loss) from Continuing Operations Before Income Taxes 129 103 361 (71)
Income tax expense/(benefit) 8 4 7 (1)
Income/(Loss) from Continuing Operations 121 99 354 (70)
Loss from discontinued operations, net of income tax (25) (741) (25) (775)
Net Income/(Loss) 96 (642) 329 (845)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 24 (16) (22) (55)
Net Income Attributable to NRG Energy, Inc. 72 (626) 351 (790)
Eliminations        
Operating Revenues        
Total operating revenues (13) (23) (26) (36)
Operating Costs and Expenses        
Cost of operations (5) (21) (17) (36)
Depreciation and amortization 0 0 0 0
Impairment losses 0 0 0 0
Selling, general and administrative (10) (1) (10) (1)
Reorganization costs 0   0  
Development costs 0 0 (1) 0
Total operating costs and expenses (15) (22) (28) (37)
Other income - affiliate   0   0
Gain on sale of assets 0 0 0 0
Operating Income/(Loss) 2 (1) 2 1
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries (362) 141 (694) 87
Equity in earnings/(losses) of unconsolidated affiliates 0 0 0 0
Other income/(expense), net 0 (34) 0 (35)
Loss on debt extinguishment, net 0   0 0
Interest expense 0 0 0 0
Total other expense (362) 107 (694) 52
Income/(Loss) from Continuing Operations Before Income Taxes (360) 106 (692) 53
Income tax expense/(benefit) 0 0 0 0
Income/(Loss) from Continuing Operations (360) 106 (692) 53
Loss from discontinued operations, net of income tax 0 0 0 0
Net Income/(Loss) (360) 106 (692) 53
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 2 (35) 2 (34)
Net Income Attributable to NRG Energy, Inc. (362) 141 (694) 87
Guarantor Subsidiaries        
Operating Revenues        
Total operating revenues 2,276 2,060 4,120 3,878
Operating Costs and Expenses        
Cost of operations 1,778 1,530 3,004 3,050
Depreciation and amortization 76 99 149 198
Impairment losses 0 42 0 42
Selling, general and administrative 110 96 213 205
Reorganization costs 1   3  
Development costs 0 0 0 0
Total operating costs and expenses 1,965 1,767 3,369 3,495
Other income - affiliate   0   0
Gain on sale of assets 0 2 3 4
Operating Income/(Loss) 311 295 754 387
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 7 8 9 13
Equity in earnings/(losses) of unconsolidated affiliates 0 0 0 0
Other income/(expense), net 4 0 8 1
Loss on debt extinguishment, net 0   0 0
Interest expense (4) (4) (7) (7)
Total other expense 7 4 10 7
Income/(Loss) from Continuing Operations Before Income Taxes 318 299 764 394
Income tax expense/(benefit) 108 113 221 131
Income/(Loss) from Continuing Operations 210 186 543 263
Loss from discontinued operations, net of income tax 0 0 0 0
Net Income/(Loss) 210 186 543 263
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 0 0 0 0
Net Income Attributable to NRG Energy, Inc. 210 186 543 263
Non-Guarantor Subsidiaries        
Operating Revenues        
Total operating revenues 659 664 1,249 1,241
Operating Costs and Expenses        
Cost of operations 282 312 613 651
Depreciation and amortization 143 153 297 303
Impairment losses 74 21 74 21
Selling, general and administrative 34 29 60 64
Reorganization costs 0   0  
Development costs 13 13 23 25
Total operating costs and expenses 546 528 1,067 1,064
Other income - affiliate   0   0
Gain on sale of assets 14 0 13 0
Operating Income/(Loss) 127 136 195 177
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 0 0 0 0
Equity in earnings/(losses) of unconsolidated affiliates 18 (2) 17 4
Other income/(expense), net (26) 41 (36) 47
Loss on debt extinguishment, net 0   0 (2)
Interest expense (92) (121) (164) (225)
Total other expense (100) (82) (183) (176)
Income/(Loss) from Continuing Operations Before Income Taxes 27 54 12 1
Income tax expense/(benefit) (68) 267 (20) 237
Income/(Loss) from Continuing Operations 95 (213) 32 (236)
Loss from discontinued operations, net of income tax 0 (123) 0 (160)
Net Income/(Loss) 95 (336) 32 (396)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests (57) (9) (119) (46)
Net Income Attributable to NRG Energy, Inc. 152 (327) 151 (350)
NRG Energy, Inc. (Note Issuer)        
Operating Revenues        
Total operating revenues 0 0 0 0
Operating Costs and Expenses        
Cost of operations (4) 20 9 39
Depreciation and amortization 8 8 16 16
Impairment losses 0 0 0 0
Selling, general and administrative 77 97 139 213
Reorganization costs 22   40  
Development costs 3 5 7 10
Total operating costs and expenses 106 130 211 278
Other income - affiliate   39   87
Gain on sale of assets 0 0 0 0
Operating Income/(Loss) (106) (91) (211) (191)
Other Income/(Expense)        
Equity in earnings of consolidated subsidiaries 355 (149) 685 (100)
Equity in earnings/(losses) of unconsolidated affiliates 0 (1) (1) (2)
Other income/(expense), net 2 7 5 13
Loss on debt extinguishment, net (1)   (3) 0
Interest expense (106) (122) (198) (239)
Total other expense 250 (265) 488 (328)
Income/(Loss) from Continuing Operations Before Income Taxes 144 (356) 277 (519)
Income tax expense/(benefit) (32) (376) (194) (369)
Income/(Loss) from Continuing Operations 176 20 471 (150)
Loss from discontinued operations, net of income tax (25) (618) (25) (615)
Net Income/(Loss) 151 (598) 446 (765)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 79 28 95 25
Net Income Attributable to NRG Energy, Inc. $ 72 $ (626) $ 351 $ (790)