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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Assets        
Cash and cash equivalents $ 563 $ 770 $ 591  
Funds deposited by counterparties 33 37 2  
Restricted cash 17 279 267  
Accounts receivable - trade 1,019 900    
Inventory 412 453    
Derivative instruments 764 624    
Cash collateral posted in support of energy risk management activities 287 171    
Accounts receivable - affiliate 5 180    
Prepayments and other current assets 302 163    
Current assets - held-for-sale 1 116    
Current assets - discontinued operations 197 744    
Total current assets 3,600 4,437    
Property, plant and equipment, net 3,048 5,974    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 412 182    
Goodwill 573 539    
Intangible assets, net 591 507    
Nuclear decommissioning trust fund 663 692    
Derivative instruments 317 159    
Deferred income taxes 46 6    
Other non-current assets 289 310    
Non-current assets - held-for-sale 77 43    
Non-current assets - discontinued operations 1,012 10,506    
Total other assets 3,980 12,944    
Total Assets 10,628 23,355    
Current Liabilities        
Current portion of long-term debt and capital leases 72 204    
Accounts payable 862 684    
Accounts payable - affiliate 1 57    
Derivative instruments 673 537    
Cash collateral received in support of energy risk management activities 33 37    
Accrued expenses and other current liabilities 680 756    
Accrued expenses and other current liabilities - affiliate 0 161    
Current liabilities - held for sale 5 72    
Current liabilities - discontinued operations 72 846    
Total current liabilities 2,398 3,354    
Other Liabilities        
Long-term debt and capital leases 6,449 9,180    
Nuclear decommissioning reserve 282 269    
Nuclear decommissioning trust liability 371 415    
Postretirement and other benefit obligations 435 458    
Derivative instruments 304 143    
Deferred income taxes 65 21    
Out-of-market contracts, net 121 129    
Other non-current liabilities 718 534    
Non-current liabilities - held-for-sale 65 8    
Non-current liabilities - discontinued operations 635 6,798    
Total non-current liabilities 9,445 17,955    
Total Liabilities 11,843 21,309    
Redeemable noncontrolling interest in subsidiaries 19 78 46 $ 29
Total Stockholders' Equity (1,234) 1,968 $ 4,446 $ 5,434
Total Liabilities and Stockholders' Equity 10,628 23,355    
Eliminations        
Current Assets        
Cash and cash equivalents 0 0    
Funds deposited by counterparties 0 0    
Restricted cash 0 0    
Accounts receivable - trade 0 0    
Inventory 0 0    
Derivative instruments (81) (57)    
Cash collateral posted in support of energy risk management activities 0 0    
Accounts receivable - affiliate (754) (534)    
Prepayments and other current assets 0 0    
Current assets - held-for-sale 0 0    
Current assets - discontinued operations 0 0    
Total current assets (835) (591)    
Property, plant and equipment, net 0 (4)    
Other Assets        
Investment in subsidiaries (5,153) (8,500)    
Equity investments in affiliates 0 0    
Goodwill 0 0    
Intangible assets, net 0 (3)    
Nuclear decommissioning trust fund 0 0    
Derivative instruments (5) 0    
Deferred income taxes 0 0    
Other non-current assets (12) 0    
Non-current assets - held-for-sale 0 0    
Non-current assets - discontinued operations 0 (22)    
Total other assets (5,170) (8,525)    
Total Assets (6,005) (9,120)    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 0 0    
Accounts payable - affiliate (754) (534)    
Derivative instruments (81) (57)    
Cash collateral received in support of energy risk management activities 0 0    
Accrued expenses and other current liabilities 0 0    
Accrued expenses and other current liabilities - affiliate   0    
Current liabilities - held for sale 0 0    
Current liabilities - discontinued operations 0 0    
Total current liabilities (835) (591)    
Other Liabilities        
Long-term debt and capital leases (12) 0    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Postretirement and other benefit obligations 0 0    
Derivative instruments (5) 0    
Deferred income taxes 0 0    
Out-of-market contracts, net 0 0    
Other non-current liabilities 0 0    
Non-current liabilities - held-for-sale 0 0    
Non-current liabilities - discontinued operations 0 0    
Total non-current liabilities (17) 0    
Total Liabilities (852) (591)    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders' Equity (5,153) (8,529)    
Total Liabilities and Stockholders' Equity (6,005) (9,120)    
Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 55 0    
Funds deposited by counterparties 33 37    
Restricted cash 7 4    
Accounts receivable - trade 894 852    
Inventory 278 307    
Derivative instruments 779 647    
Cash collateral posted in support of energy risk management activities 275 170    
Accounts receivable - affiliate 460 685    
Prepayments and other current assets 180 106    
Current assets - held-for-sale 0 8    
Current assets - discontinued operations 177 89    
Total current assets 3,138 2,905    
Property, plant and equipment, net 1,938 2,052    
Other Assets        
Investment in subsidiaries 446 266    
Equity investments in affiliates 0 0    
Goodwill 359 359    
Intangible assets, net 422 455    
Nuclear decommissioning trust fund 663 692    
Derivative instruments 296 126    
Deferred income taxes 6 377    
Other non-current assets 133 64    
Non-current assets - held-for-sale 0 0    
Non-current assets - discontinued operations 405 456    
Total other assets 2,730 2,795    
Total Assets 7,806 7,752    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 693 582    
Accounts payable - affiliate 675 725    
Derivative instruments 713 556    
Cash collateral received in support of energy risk management activities 33 37    
Accrued expenses and other current liabilities 291 313    
Accrued expenses and other current liabilities - affiliate   0    
Current liabilities - held for sale 0 0    
Current liabilities - discontinued operations 24 34    
Total current liabilities 2,429 2,247    
Other Liabilities        
Long-term debt and capital leases 244 244    
Nuclear decommissioning reserve 282 269    
Nuclear decommissioning trust liability 371 415    
Postretirement and other benefit obligations 114 118    
Derivative instruments 306 136    
Deferred income taxes 112 112    
Out-of-market contracts, net 0 0    
Other non-current liabilities 288 284    
Non-current liabilities - held-for-sale 0 0    
Non-current liabilities - discontinued operations 58 73    
Total non-current liabilities 1,775 1,651    
Total Liabilities 4,204 3,898    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders' Equity 3,602 3,854    
Total Liabilities and Stockholders' Equity 7,806 7,752    
Non-Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 28 150    
Funds deposited by counterparties 0 0    
Restricted cash 10 275    
Accounts receivable - trade 82 44    
Inventory 134 146    
Derivative instruments 50 24    
Cash collateral posted in support of energy risk management activities 12 1    
Accounts receivable - affiliate 33 183    
Prepayments and other current assets 32 30    
Current assets - held-for-sale 1 108    
Current assets - discontinued operations 20 655    
Total current assets 402 1,616    
Property, plant and equipment, net 957 3,689    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 412 181    
Goodwill 214 180    
Intangible assets, net 169 55    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 4 2    
Deferred income taxes (143) (135)    
Other non-current assets 71 126    
Non-current assets - held-for-sale 77 43    
Non-current assets - discontinued operations 607 10,072    
Total other assets 1,411 10,524    
Total Assets 2,770 15,829    
Current Liabilities        
Current portion of long-term debt and capital leases 55 183    
Accounts payable 64 47    
Accounts payable - affiliate (249) (310)    
Derivative instruments 41 38    
Cash collateral received in support of energy risk management activities 0 0    
Accrued expenses and other current liabilities 36 67    
Accrued expenses and other current liabilities - affiliate   0    
Current liabilities - held for sale 5 72    
Current liabilities - discontinued operations 48 807    
Total current liabilities 0 904    
Other Liabilities        
Long-term debt and capital leases 192 2,197    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Postretirement and other benefit obligations 1 1    
Derivative instruments 3 7    
Deferred income taxes 61 64    
Out-of-market contracts, net 121 129    
Other non-current liabilities 198 198    
Non-current liabilities - held-for-sale 65 8    
Non-current liabilities - discontinued operations 577 6,725    
Total non-current liabilities 1,218 9,329    
Total Liabilities 1,218 10,233    
Redeemable noncontrolling interest in subsidiaries 19 78    
Total Stockholders' Equity 1,533 5,518    
Total Liabilities and Stockholders' Equity 2,770 15,829    
NRG Energy, Inc.        
Current Assets        
Cash and cash equivalents 480 620    
Funds deposited by counterparties 0 0    
Restricted cash 0 0    
Accounts receivable - trade 43 4    
Inventory 0 0    
Derivative instruments 16 10    
Cash collateral posted in support of energy risk management activities 0 0    
Accounts receivable - affiliate 266 (154)    
Prepayments and other current assets 90 27    
Current assets - held-for-sale 0 0    
Current assets - discontinued operations 0 0    
Total current assets 895 507    
Property, plant and equipment, net 153 237    
Other Assets        
Investment in subsidiaries 4,707 8,234    
Equity investments in affiliates 0 1    
Goodwill 0 0    
Intangible assets, net 0 0    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 22 31    
Deferred income taxes 183 (236)    
Other non-current assets 97 120    
Non-current assets - held-for-sale 0 0    
Non-current assets - discontinued operations 0 0    
Total other assets 5,009 8,150    
Total Assets 6,057 8,894    
Current Liabilities        
Current portion of long-term debt and capital leases 17 21    
Accounts payable 105 55    
Accounts payable - affiliate 329 176    
Derivative instruments 0 0    
Cash collateral received in support of energy risk management activities 0 0    
Accrued expenses and other current liabilities 353 376    
Accrued expenses and other current liabilities - affiliate   161    
Current liabilities - held for sale 0 0    
Current liabilities - discontinued operations 0 5    
Total current liabilities 804 794    
Other Liabilities        
Long-term debt and capital leases 6,025 6,739    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Postretirement and other benefit obligations 320 339    
Derivative instruments 0 0    
Deferred income taxes (108) (155)    
Out-of-market contracts, net 0 0    
Other non-current liabilities 232 52    
Non-current liabilities - held-for-sale 0 0    
Non-current liabilities - discontinued operations 0 0    
Total non-current liabilities 6,469 6,975    
Total Liabilities 7,273 7,769    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders' Equity (1,216) 1,125    
Total Liabilities and Stockholders' Equity $ 6,057 $ 8,894