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Segment Reporting (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
MW
Dec. 31, 2017
USD ($)
MW
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information                          
Generation capacity (in MW) | MW 30,000 30,000                 30,000    
Income Statement                          
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 expenses                     8,487 8,396 10,228
Depreciation and amortization                     1,056 1,172 1,351
Impairment losses                     1,709 702 4,860
Development costs                     67 89 154
Total operating costs and expenses                     11,319 10,359 16,593
Other income - affiliate $ 84                   87 193 193
Gain/(loss) 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)
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)
Loss on debt extinguishment                     (53) (142) 10
Interest expense                     (890) (895) (937)
Loss from Continuing Operations Before Income Taxes                     (1,540) (978) (4,986)
Income tax 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 income/(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)
Balance sheet                          
Equity investments in affiliates 1,038 1,038       1,120         1,038 1,120  
Capital expenditures 1,127 1,127       997         1,127 997  
Goodwill 539 539       662         539 662  
Total Assets 23,318 23,318       30,682         23,318 30,682  
Generation                          
Income Statement                          
Other income - affiliate                     0    
Retail                          
Income Statement                          
Other income - affiliate                     0    
Renewables                          
Income Statement                          
Impairment losses   15 $ 14 $ 22                  
Other income - affiliate                     0    
NRG Yield                          
Income Statement                          
Other income - affiliate                     0    
Corporate                          
Income Statement                          
Other income - affiliate                     87    
Operating Segments | Generation                          
Income Statement                          
Operating revenues                     3,773 3,833 5,179
Operating expenses                     3,300 3,545 4,198
Depreciation and amortization                     377 516 693
Impairment losses                     1,504 430 4,655
Development costs                     13 15 26
Total operating costs and expenses                     5,194 4,506 9,572
Other income - affiliate                       0 0
Gain/(loss) on sale of assets                     20 0  
Gain on postretirement benefits curtailment                         21
Operating (Loss)/Income                     (1,401) (673) (4,372)
Equity in (losses)/earnings of unconsolidated affiliates                     (14) (5) 10
Impairment losses on investments                     (74) (142) (14)
Other income, net                     22 21 18
Loss on sale of equity method investment                         0
Loss on debt extinguishment                     0 0 0
Interest expense                     (29) (26) (25)
Loss from Continuing Operations Before Income Taxes                     (1,496) (825) (4,383)
Income tax expense                     2 (1) 0
Net Loss from Continuing Operations                     (1,498) (824) (4,383)
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     (1,498) (824) (4,383)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     0 0 0
Net Loss Attributable to NRG Energy, Inc.                     (1,498) (824) (4,383)
Balance sheet                          
Equity investments in affiliates 179 179       204         179 204  
Capital expenditures 481 481       522         481 522  
Goodwill 165 165       276         165 276  
Total Assets 7,209 7,209       13,514         7,209 13,514  
Operating Segments | Retail                          
Income Statement                          
Operating revenues                     6,380 6,335 6,913
Operating expenses                     5,372 5,164 6,138
Depreciation and amortization                     117 111 132
Impairment losses                     7 1 36
Development costs                     2 4 4
Total operating costs and expenses                     5,498 5,280 6,310
Other income - affiliate                       0 0
Gain/(loss) on sale of assets                     0 (1)  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     882 1,054 603
Equity in (losses)/earnings of unconsolidated affiliates                     0 0 0
Impairment losses on investments                     0 0 0
Other income, net                     1 (6) (4)
Loss on sale of equity method investment                         0
Loss on debt extinguishment                     0 0 0
Interest expense                     (6) 6 2
Loss from Continuing Operations Before Income Taxes                     877 1,054 601
Income tax expense                     (9) 1 1
Net Loss from Continuing Operations                     886 1,053 600
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     886 1,053 600
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     2 (2) 0
Net Loss Attributable to NRG Energy, Inc.                     884 1,055 600
Balance sheet                          
Equity investments in affiliates 0 0       0         0 0  
Capital expenditures 82 82       12         82 12  
Goodwill 374 374       374         374 374  
Total Assets 2,630 2,630       2,332         2,630 2,332  
Operating Segments | Renewables                          
Income Statement                          
Operating revenues                     424 406 383
Operating expenses                     211 217 187
Depreciation and amortization                     196 185 176
Impairment losses                     154 54 13
Development costs                     45 40 61
Total operating costs and expenses                     606 496 437
Other income - affiliate                       0 0
Gain/(loss) on sale of assets                     (5) 0  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     (187) (90) (54)
Equity in (losses)/earnings of unconsolidated affiliates                     0 (58) (7)
Impairment losses on investments                     0 (105) 0
Other income, net                     0 1 3
Loss on sale of equity method investment                         0
Loss on debt extinguishment                     (1) 0 0
Interest expense                     (98) (98) (79)
Loss from Continuing Operations Before Income Taxes                     (286) (350) (137)
Income tax expense                     (20) (20) (18)
Net Loss from Continuing Operations                     (266) (330) (119)
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     (266) (330) (119)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     (103) (13) 6
Net Loss Attributable to NRG Energy, Inc.                     (163) (317) (125)
Balance sheet                          
Equity investments in affiliates 4 4       26         4 26  
Capital expenditures 521 521       330         521 330  
Goodwill 0 0       12         0 12  
Total Assets 5,129 5,129       4,921         5,129 4,921  
Operating Segments | NRG Yield                          
Income Statement                          
Operating revenues                     1,009 1,035 968
Operating expenses                     348 325 338
Depreciation and amortization                     334 303 303
Impairment losses                     44 185 1
Development costs                     0 0 0
Total operating costs and expenses                     726 813 642
Other income - affiliate                       0 0
Gain/(loss) on sale of assets                     0 0  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     283 222 326
Equity in (losses)/earnings of unconsolidated affiliates                     71 60 31
Impairment losses on investments                     0 0 0
Other income, net                     4 3 3
Loss on sale of equity method investment                         0
Loss on debt extinguishment                     (3) 0 (9)
Interest expense                     (306) (284) (267)
Loss from Continuing Operations Before Income Taxes                     49 1 84
Income tax expense                     72 (1) 12
Net Loss from Continuing Operations                     (23) 2 72
(Loss)/income from discontinued operations, net of income tax                     0 0 0
Net Loss                     (23) 2 72
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     (87) (54) 19
Net Loss Attributable to NRG Energy, Inc.                     64 56 53
Balance sheet                          
Equity investments in affiliates 852 852       886         852 886  
Capital expenditures 31 31       23         31 23  
Goodwill 0 0       0         0 0  
Total Assets 8,283 8,283       8,962         8,283 8,962  
Operating Segments | Corporate                          
Income Statement                          
Operating revenues                     14 77 38
Operating expenses                     220 323 502
Depreciation and amortization                     32 57 47
Impairment losses                     0 32 133
Development costs                     7 30 63
Total operating costs and expenses                     259 442 745
Other income - affiliate                       193 193
Gain/(loss) on sale of assets                     1 (79)  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     (157) (251) (514)
Equity in (losses)/earnings of unconsolidated affiliates                     6 13 0
Impairment losses on investments                     (5) (21) (42)
Other income, net                     11 19 13
Loss on sale of equity method investment                         (14)
Loss on debt extinguishment                     (49) (142) 19
Interest expense                     (451) (495) (574)
Loss from Continuing Operations Before Income Taxes                     (645) (877) (1,112)
Income tax expense                     (37) 26 1,350
Net Loss from Continuing Operations                     (608) (903) (2,462)
(Loss)/income from discontinued operations, net of income tax                     (789) 92 (105)
Net Loss                     (1,397) (811) (2,567)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     (4) 18 (37)
Net Loss Attributable to NRG Energy, Inc.                     (1,393) (829) (2,530)
Balance sheet                          
Equity investments in affiliates 3 3       4         3 4  
Capital expenditures 12 12       110         12 110  
Goodwill 0 0       0         0 0  
Total Assets 8,919 8,919       11,891         8,919 11,891  
Eliminations                          
Income Statement                          
Operating revenues                     (971) (1,174) (1,153)
Operating expenses                     (964) (1,178) (1,135)
Depreciation and amortization                     0 0 0
Impairment losses                     0 0 22
Development costs                     0 0 0
Total operating costs and expenses                     (964) (1,178) (1,113)
Other income - affiliate                     0 0 0
Gain/(loss) on sale of assets                     0  
Gain on postretirement benefits curtailment                         0
Operating (Loss)/Income                     (7) 4 (40)
Equity in (losses)/earnings of unconsolidated affiliates                     (32) 17 2
Impairment losses on investments                     0 0 0
Other income, net                     0 (4) (7)
Loss on sale of equity method investment                         0
Loss on debt extinguishment                     0 0 0
Interest expense                     0 2 6
Loss from Continuing Operations Before Income Taxes                     (39) 19 (39)
Income tax expense                     0 0 0
Net Loss from Continuing Operations                     (39) 19 (39)
(Loss)/income from discontinued operations, net of income tax                     0 0
Net Loss                     (39) 19 (39)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests                     8 (66) (42)
Net Loss Attributable to NRG Energy, Inc.                     (47) 85 3
Balance sheet                          
Equity investments in affiliates 0 0       0         0 0  
Capital expenditures 0 0       0         0 0  
Goodwill 0 0       0         0 0  
Total Assets $ (8,852) $ (8,852)       $ (10,938)         (8,852) (10,938)  
Eliminations | Generation                          
Income Statement                          
Operating revenues                     (910) (1,033) (896)
Eliminations | Retail                          
Income Statement                          
Operating revenues                     (5) (4) (6)
Eliminations | Renewables                          
Income Statement                          
Operating revenues                     (31) (24) (31)
Eliminations | NRG Yield                          
Income Statement                          
Operating revenues                     0 (8) (29)
Eliminations | Corporate                          
Income Statement                          
Operating revenues                     $ (25) $ (105) $ (191)
NRG Yield                          
Segment Reporting Information                          
Generation capacity (in MW) | MW 555 555                 555    
Consideration paid for acquisitions                     $ 245