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Condensed Consolidating Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating Revenues    
Total operating revenues $ 2,165 $ 2,065
Operating Costs and Expenses    
Cost of operations 1,651 1,385
Depreciation and amortization 85 120
Selling, general and administrative 194 176
Reorganization costs 13 20
Development costs 2 5
Total operating costs and expenses 1,945 1,706
Gain/(loss) on sale of assets 1 2
Operating Income/(Loss) 221 361
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 0 0
Equity in (losses)/earnings of unconsolidated affiliates (21) 1
Other income/(expense), net 12 0
Loss on debt extinguishment, net 0 (2)
Interest expense (114) (116)
Total other income/(expense) (123) (117)
Income from Continuing Operations Before Income Taxes 98 244
Income tax expense/(benefit) 4 6
Income from Continuing Operations 94 238
Income/(Loss) from discontinued operations, net of income tax 388 (5)
Net Income 482 233
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests 0 (46)
Net income attributable to NRG Energy, Inc. 482 279
Eliminations    
Operating Revenues    
Total operating revenues 1 (8)
Operating Costs and Expenses    
Cost of operations 1 (8)
Depreciation and amortization 0 0
Selling, general and administrative 0 0
Reorganization costs 0 0
Development costs 0 0
Total operating costs and expenses 1 (8)
Gain/(loss) on sale of assets 0 0
Operating Income/(Loss) 0 0
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries (309) (333)
Equity in (losses)/earnings of unconsolidated affiliates 0 0
Other income/(expense), net 0 0
Loss on debt extinguishment, net   0
Interest expense 0 0
Total other income/(expense) (309) (333)
Income from Continuing Operations Before Income Taxes (309) (333)
Income tax expense/(benefit) 0 0
Income from Continuing Operations (309) (333)
Income/(Loss) from discontinued operations, net of income tax 0 0
Net Income (309) (333)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests   0
Net income attributable to NRG Energy, Inc. (309) (333)
Guarantor Subsidiaries    
Operating Revenues    
Total operating revenues 1,769 1,744
Operating Costs and Expenses    
Cost of operations 1,358 1,155
Depreciation and amortization 54 60
Selling, general and administrative 122 104
Reorganization costs 0 2
Development costs 0 0
Total operating costs and expenses 1,534 1,321
Gain/(loss) on sale of assets 1 3
Operating Income/(Loss) 236 426
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 10 1
Equity in (losses)/earnings of unconsolidated affiliates 0 0
Other income/(expense), net 4 5
Loss on debt extinguishment, net   0
Interest expense (4) (3)
Total other income/(expense) 10 3
Income from Continuing Operations Before Income Taxes 246 429
Income tax expense/(benefit) 0 113
Income from Continuing Operations 246 316
Income/(Loss) from discontinued operations, net of income tax 9 15
Net Income 255 331
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests   0
Net income attributable to NRG Energy, Inc. 255 331
Non-Guarantor Subsidiaries    
Operating Revenues    
Total operating revenues 395 329
Operating Costs and Expenses    
Cost of operations 283 224
Depreciation and amortization 23 52
Selling, general and administrative 16 11
Reorganization costs 0 0
Development costs 0 1
Total operating costs and expenses 322 288
Gain/(loss) on sale of assets 0 (1)
Operating Income/(Loss) 73 40
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 0 0
Equity in (losses)/earnings of unconsolidated affiliates (21) 2
Other income/(expense), net 1 (7)
Loss on debt extinguishment, net   0
Interest expense (4) (21)
Total other income/(expense) (24) (26)
Income from Continuing Operations Before Income Taxes 49 14
Income tax expense/(benefit) 0 55
Income from Continuing Operations 49 (41)
Income/(Loss) from discontinued operations, net of income tax 5 (20)
Net Income 54 (61)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests   (63)
Net income attributable to NRG Energy, Inc. 54 2
NRG Energy, Inc. (Note Issuer)    
Operating Revenues    
Total operating revenues 0 0
Operating Costs and Expenses    
Cost of operations 9 14
Depreciation and amortization 8 8
Selling, general and administrative 56 61
Reorganization costs 13 18
Development costs 2 4
Total operating costs and expenses 88 105
Gain/(loss) on sale of assets 0 0
Operating Income/(Loss) (88) (105)
Other Income/(Expense)    
Equity in earnings of consolidated subsidiaries 299 332
Equity in (losses)/earnings of unconsolidated affiliates 0 (1)
Other income/(expense), net 7 2
Loss on debt extinguishment, net   (2)
Interest expense (106) (92)
Total other income/(expense) 200 239
Income from Continuing Operations Before Income Taxes 112 134
Income tax expense/(benefit) 4 (162)
Income from Continuing Operations 108 296
Income/(Loss) from discontinued operations, net of income tax 374 0
Net Income 482 296
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interests   17
Net income attributable to NRG Energy, Inc. $ 482 $ 279