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Condensed Consolidating Financial Information - BALANCE SHEETS (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current Assets        
Cash and cash equivalents $ 764 $ 991 $ 627 $ 938
Funds deposited by counterparties 241 37 3 2
Restricted cash 407 508 $ 397 $ 446
Accounts receivable, net 903 1,079    
Inventory 528 532    
Derivative instruments 1,015 626    
Cash collateral paid in support of energy risk management activities 211 171    
Accounts receivable - affiliate 73 95    
Prepayments and other current assets 326 261    
Current assets held-for-sale 89 115    
Total current assets 4,557 4,415    
Property, plant and equipment, net 13,911 13,908    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 1,011 1,038    
Goodwill 539 539    
Intangible assets, net 1,726 1,746    
Nuclear decommissioning trust fund 680 692    
Derivative instruments 354 172    
Deferred income tax 136 134    
Non-current assets held-for-sale 157 43    
Other non-current assets 681 631    
Total other assets 5,284 4,995    
Total Assets 23,752 23,318    
Current Liabilities        
Current portion of long-term debt and capital leases 956 688    
Accounts payable 787 881    
Accounts payable - affiliate 32 33    
Derivative instruments 790 555    
Cash collateral received in support of energy risk management activities 240 37    
Current liabilities held-for-sale 80 72    
Accrued expenses and other current liabilities 662 890    
Accrued expenses and other current liabilities-affiliate 161 161    
Total current liabilities 3,708 3,317    
Other Liabilities        
Long-term debt and capital leases 15,406 15,716    
Nuclear decommissioning reserve 272 269    
Nuclear decommissioning trust liability 400 415    
Deferred income taxes 20 21    
Derivative instruments 264 197    
Out-of-market contracts, net 201 207    
Non-current liabilities held-for-sale 7 8    
Other non-current liabilities 1,136 1,122    
Total non-current liabilities 17,706 17,955    
Total Liabilities 21,414 21,272    
Redeemable noncontrolling interest in subsidiaries 80 78    
Total Stockholders’ Equity 2,258 1,968    
Total Liabilities and Stockholders’ Equity 23,752 23,318    
Eliminations        
Current Assets        
Cash and cash equivalents 0 0    
Funds deposited by counterparties 0 0    
Restricted cash 0 0    
Accounts receivable, net 0 0    
Inventory 0 0    
Derivative instruments (136) (89)    
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate (1,068) (698)    
Prepayments and other current assets 0 0    
Current assets held-for-sale 0 0    
Total current assets (1,204) (787)    
Property, plant and equipment, net (25) (26)    
Other Assets        
Investment in subsidiaries (7,886) (7,886)    
Equity investments in affiliates 0 0    
Goodwill 0 0    
Intangible assets, net (3) (3)    
Nuclear decommissioning trust fund 0 0    
Derivative instruments (47) (20)    
Deferred income tax 0 0    
Non-current assets held-for-sale 0 0    
Other non-current assets 0 (38)    
Total other assets (7,936) (7,947)    
Total Assets (9,165) (8,760)    
Current Liabilities        
Current portion of long-term debt and capital leases 0 (38)    
Accounts payable 0 0    
Accounts payable - affiliate (1,068) (698)    
Derivative instruments (136) (88)    
Cash collateral received in support of energy risk management activities 0 0    
Current liabilities held-for-sale 0 0    
Accrued expenses and other current liabilities 0 0    
Accrued expenses and other current liabilities-affiliate 0 0    
Total current liabilities (1,204) (824)    
Other Liabilities        
Long-term debt and capital leases 0 0    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes 0 0    
Derivative instruments (47) (20)    
Out-of-market contracts, net 0 0    
Non-current liabilities held-for-sale 0 0    
Other non-current liabilities 0 0    
Total non-current liabilities (47) (20)    
Total Liabilities (1,251) (844)    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity (7,914) (7,916)    
Total Liabilities and Stockholders’ Equity (9,165) (8,760)    
Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 43 0    
Funds deposited by counterparties 241 37    
Restricted cash 8 4    
Accounts receivable, net 610 768    
Inventory 323 338    
Derivative instruments 932 625    
Cash collateral paid in support of energy risk management activities 211 170    
Accounts receivable - affiliate 509 709    
Prepayments and other current assets 154 116    
Current assets held-for-sale 0 8    
Total current assets 3,031 2,775    
Property, plant and equipment, net 2,500 2,502    
Other Assets        
Investment in subsidiaries 511 305    
Equity investments in affiliates 0 0    
Goodwill 360 360    
Intangible assets, net 439 454    
Nuclear decommissioning trust fund 680 692    
Derivative instruments 245 121    
Deferred income tax 264 377    
Non-current assets held-for-sale 0 0    
Other non-current assets 73 50    
Total other assets 2,572 2,359    
Total Assets 8,103 7,636    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 510 545    
Accounts payable - affiliate 1,662 751    
Derivative instruments 857 535    
Cash collateral received in support of energy risk management activities 240 37    
Current liabilities held-for-sale 0 0    
Accrued expenses and other current liabilities 236 290    
Accrued expenses and other current liabilities-affiliate 0 0    
Total current liabilities 3,505 2,158    
Other Liabilities        
Long-term debt and capital leases 244 244    
Nuclear decommissioning reserve 272 269    
Nuclear decommissioning trust liability 400 415    
Deferred income taxes 112 112    
Derivative instruments 224 110    
Out-of-market contracts, net 62 66    
Non-current liabilities held-for-sale 0 0    
Other non-current liabilities 419 410    
Total non-current liabilities 1,733 1,626    
Total Liabilities 5,238 3,784    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity 2,865 3,852    
Total Liabilities and Stockholders’ Equity 8,103 7,636    
Non-Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 371 348    
Funds deposited by counterparties 0 0    
Restricted cash 399 504    
Accounts receivable, net 290 307    
Inventory 205 194    
Derivative instruments 207 81    
Cash collateral paid in support of energy risk management activities 0 1    
Accounts receivable - affiliate 141 213    
Prepayments and other current assets 134 118    
Current assets held-for-sale 89 107    
Total current assets 1,836 1,873    
Property, plant and equipment, net 11,196 11,194    
Other Assets        
Investment in subsidiaries 1 0    
Equity investments in affiliates 1,010 1,036    
Goodwill 179 179    
Intangible assets, net 1,290 1,295    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 118 40    
Deferred income tax (34) (7)    
Non-current assets held-for-sale 157 43    
Other non-current assets 489 461    
Total other assets 3,210 3,047    
Total Assets 16,242 16,114    
Current Liabilities        
Current portion of long-term debt and capital leases 935 667    
Accounts payable 241 281    
Accounts payable - affiliate (121) (201)    
Derivative instruments 69 108    
Cash collateral received in support of energy risk management activities 0 0    
Current liabilities held-for-sale 80 72    
Accrued expenses and other current liabilities 146 175    
Accrued expenses and other current liabilities-affiliate 0 0    
Total current liabilities 1,350 1,102    
Other Liabilities        
Long-term debt and capital leases 8,387 8,733    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes 64 64    
Derivative instruments 87 107    
Out-of-market contracts, net 139 141    
Non-current liabilities held-for-sale 7 8    
Other non-current liabilities 324 321    
Total non-current liabilities 9,008 9,374    
Total Liabilities 10,358 10,476    
Redeemable noncontrolling interest in subsidiaries 80 78    
Total Stockholders’ Equity 5,804 5,560    
Total Liabilities and Stockholders’ Equity 16,242 16,114    
NRG Energy, Inc. (Note Issuer)        
Current Assets        
Cash and cash equivalents 350 643    
Funds deposited by counterparties 0 0    
Restricted cash 0 0    
Accounts receivable, net 3 4    
Inventory 0 0    
Derivative instruments 12 9    
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate 491 (129)    
Prepayments and other current assets 38 27    
Current assets held-for-sale 0 0    
Total current assets 894 554    
Property, plant and equipment, net 240 238    
Other Assets        
Investment in subsidiaries 7,374 7,581    
Equity investments in affiliates 1 2    
Goodwill 0 0    
Intangible assets, net 0 0    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 38 31    
Deferred income tax (94) (236)    
Non-current assets held-for-sale 0 0    
Other non-current assets 119 158    
Total other assets 7,438 7,536    
Total Assets 8,572 8,328    
Current Liabilities        
Current portion of long-term debt and capital leases 21 59    
Accounts payable 36 55    
Accounts payable - affiliate (441) 181    
Derivative instruments 0 0    
Cash collateral received in support of energy risk management activities 0 0    
Current liabilities held-for-sale 0 0    
Accrued expenses and other current liabilities 280 425    
Accrued expenses and other current liabilities-affiliate 161 161    
Total current liabilities 57 881    
Other Liabilities        
Long-term debt and capital leases 6,775 6,739    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes (156) (155)    
Derivative instruments 0 0    
Out-of-market contracts, net 0 0    
Non-current liabilities held-for-sale 0 0    
Other non-current liabilities 393 391    
Total non-current liabilities 7,012 6,975    
Total Liabilities 7,069 7,856    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity 1,503 472    
Total Liabilities and Stockholders’ Equity $ 8,572 $ 8,328