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Condensed Consolidating Financial Information - Statements of Operations (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Revenues                          
Total operating revenues   $ 2,497 $ 3,049 $ 2,701 $ 2,382 $ 2,184 $ 3,421 $ 2,248 $ 2,659   $ 10,629 $ 10,512 $ 12,328
Operating Costs and Expenses                          
Cost of operations                     7,536 7,301 9,000
Depreciation and amortization                     1,056 1,172 1,351
Impairment losses                     1,709 702 4,860
Selling, general and administrative                     907 1,095 1,228
Reorganization costs                     44    
Development costs                     67 89 154
Total operating costs and expenses                     11,319 10,359 16,593
Other income - affiliate $ 84                   87 193 193
Gain on sale of assets                     16 (80) 0
Gain on postretirement benefits curtailment                     0 0 21
Operating (Loss)/Income   (1,345) 376 343 39 (658) 429 164 331   (587) 266 (4,051)
Other (Expense)/Income                          
Equity in (losses)/earnings of consolidated subsidiaries                     0 0 0
Equity in (losses)/earnings of unconsolidated affiliates                     31 27 36
Impairment losses on investments                   $ (56) (79) (268) (56)
Other income, net                     38 34 26
Loss on sale of equity method investment                     0 0 (14)
Net (loss)/gain on debt extinguishment                     (53) (142) 10
Interest expense                     (890) (895) (937)
Total other expense                     (953) (1,244) (935)
Loss from Continuing Operations Before Income Taxes                     (1,540) (978) (4,986)
Income tax (benefit)/expense                     8 5 1,345
Net Loss from Continuing Operations   (1,667) 190 99 (170) (891) 128 (163) (57)   (1,548) (983) (6,331)
(Loss)/income from discontinued operations, net of income tax   13 (27) (741) (34) (164) 265 (113) 104   (789) 92 (105)
Net Loss   (1,655) 163 (642) (203) (1,055) 393 (276) 47   (2,337) (891) (6,436)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests   (120) (8) (16) (40) (68) (9) (5) (35)   (184) (117) (54)
Net Loss Attributable to NRG Energy, Inc.   $ (1,535) $ 171 $ (626) $ (163) $ (987) $ 402 $ (271) $ 82   (2,153) (774) (6,382)
Eliminations                          
Operating Revenues                          
Total operating revenues                     (252) (219) (94)
Operating Costs and Expenses                          
Cost of operations                     (249) (223) (94)
Depreciation and amortization                     0 0 0
Impairment losses                     0 0 0
Selling, general and administrative                     (3) 0 0
Reorganization costs                     0    
Development costs                     0 0 0
Total operating costs and expenses                     (252) (223) (94)
Other income - affiliate                     0 0 0
Gain on sale of assets                     0 0  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     0 4 0
Other (Expense)/Income                          
Equity in (losses)/earnings of consolidated subsidiaries                     1,249 (132) 2,910
Equity in (losses)/earnings of unconsolidated affiliates                     (60) (10) (9)
Impairment losses on investments                     0 0 0
Other income, net                     0 (2) 0
Loss on sale of equity method investment                         0
Net (loss)/gain on debt extinguishment                     0 0 0
Interest expense                     0 0 0
Total other expense                     1,189 (144) 2,901
Loss from Continuing Operations Before Income Taxes                     1,189 (140) 2,901
Income tax (benefit)/expense                     0 62 53
Net Loss from Continuing Operations                     1,189 (202) 2,848
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     1,189 (202) 2,848
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests                     (60) (70) (62)
Net Loss Attributable to NRG Energy, Inc.                     1,249 (132) 2,910
Guarantor Subsidiaries                          
Operating Revenues                          
Total operating revenues                     7,182 7,509 9,881
Operating Costs and Expenses                          
Cost of operations                     5,373 5,402 7,610
Depreciation and amortization                     405 565 751
Impairment losses                     1,463 378 4,494
Selling, general and administrative                     371 415 468
Reorganization costs                     6    
Development costs                     0 0 0
Total operating costs and expenses                     7,618 6,760 13,323
Other income - affiliate                     0 0 0
Gain on sale of assets                     4 (1)  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     (432) 748 (3,442)
Other (Expense)/Income                          
Equity in (losses)/earnings of consolidated subsidiaries                     (1,162) (176) (109)
Equity in (losses)/earnings of unconsolidated affiliates                     0 5 8
Impairment losses on investments                     0 0 0
Other income, net                     9 4 4
Loss on sale of equity method investment                         0
Net (loss)/gain on debt extinguishment                     0 0 0
Interest expense                     (14) (15) (14)
Total other expense                     (1,167) (182) (111)
Loss from Continuing Operations Before Income Taxes                     (1,599) 566 (3,553)
Income tax (benefit)/expense                     (598) (1) (1,104)
Net Loss from Continuing Operations                     (1,001) 567 (2,449)
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     (1,001) 567 (2,449)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests                     0 0 0
Net Loss Attributable to NRG Energy, Inc.                     (1,001) 567 (2,449)
Non-Guarantor Subsidiaries                          
Operating Revenues                          
Total operating revenues                     3,699 3,222 2,541
Operating Costs and Expenses                          
Cost of operations                     2,353 2,080 1,470
Depreciation and amortization                     619 581 580
Impairment losses                     246 324 366
Selling, general and administrative                     146 192 204
Reorganization costs                     0    
Development costs                     49 59 61
Total operating costs and expenses                     3,413 3,236 2,681
Other income - affiliate                     0 0 0
Gain on sale of assets                     12 0  
Gain on postretirement benefits curtailment                         21
Operating (Loss)/Income                     298 (14) (119)
Other (Expense)/Income                          
Equity in (losses)/earnings of consolidated subsidiaries                     (113) (5) (1)
Equity in (losses)/earnings of unconsolidated affiliates                     95 36 37
Impairment losses on investments                     (75) (252) (25)
Other income, net                     17 23 21
Loss on sale of equity method investment                         0
Net (loss)/gain on debt extinguishment                     (4) (4) (9)
Interest expense                     (424) (396) (366)
Total other expense                     (504) (598) (343)
Loss from Continuing Operations Before Income Taxes                     (206) (612) (462)
Income tax (benefit)/expense                     (10) 7 (93)
Net Loss from Continuing Operations                     (196) (619) (369)
(Loss)/income from discontinued operations, net of income tax                     (160) 81 (115)
Net Loss                     (356) (538) (484)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests                     (108) (103) (23)
Net Loss Attributable to NRG Energy, Inc.                     (248) (435) (461)
NRG Energy, Inc. (Note Issuer)                          
Operating Revenues                          
Total operating revenues                     0 0 0
Operating Costs and Expenses                          
Cost of operations                     59 42 14
Depreciation and amortization                     32 26 20
Impairment losses                     0 0 0
Selling, general and administrative                     393 488 556
Reorganization costs                     38    
Development costs                     18 30 93
Total operating costs and expenses                     540 586 683
Other income - affiliate                     87 193 193
Gain on sale of assets                     0 (79)  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     (453) (472) (490)
Other (Expense)/Income                          
Equity in (losses)/earnings of consolidated subsidiaries                     26 313 (2,800)
Equity in (losses)/earnings of unconsolidated affiliates                     (4) (4) 0
Impairment losses on investments                     (4) (16) (31)
Other income, net                     12 9 1
Loss on sale of equity method investment                         (14)
Net (loss)/gain on debt extinguishment                     (49) (138) 19
Interest expense                     (452) (484) (557)
Total other expense                     (471) (320) (3,382)
Loss from Continuing Operations Before Income Taxes                     (924) (792) (3,872)
Income tax (benefit)/expense                     616 (63) 2,489
Net Loss from Continuing Operations                     (1,540) (729) (6,361)
(Loss)/income from discontinued operations, net of income tax                     (629) 11 10
Net Loss                     (2,169) (718) (6,351)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests                     (16) 56 31
Net Loss Attributable to NRG Energy, Inc.                     $ (2,153) $ (774) $ (6,382)