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Condensed Consolidating Financial Information - BALANCE SHEETS (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current Assets        
Cash and cash equivalents $ 980 $ 991 $ 752 $ 938
Funds deposited by counterparties 71 37 19 2
Restricted cash 286 508 $ 469 $ 446
Accounts receivable, net 1,371 1,079    
Inventory 485 532    
Derivative instruments 851 626    
Cash collateral paid in support of energy risk management activities 224 171    
Accounts receivable - affiliate 57 95    
Current assets held-for-sale 100 115    
Prepayments and other current assets 328 261    
Total current assets 4,753 4,415    
Property, plant and equipment, net 12,774 13,908    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 1,055 1,038    
Notes receivable, less current portion 15 2    
Goodwill 539 539    
Intangible assets, net 1,860 1,746    
Nuclear decommissioning trust fund 694 692    
Derivative instruments 426 172    
Deferred income tax 126 134    
Non-current assets held-for-sale 50 43    
Other non-current assets 655 629    
Total other assets 5,420 4,995    
Total Assets 22,947 23,318    
Current Liabilities        
Current portion of long-term debt and capital leases 952 688    
Accounts payable 975 881    
Accounts payable - affiliate 29 33    
Derivative instruments 709 555    
Cash collateral received in support of energy risk management activities 72 37    
Current liabilities held-for-sale 74 72    
Accrued expenses and other current liabilities 719 890    
Accrued expenses and other current liabilities-affiliate 133 161    
Total current liabilities 3,663 3,317    
Other Liabilities        
Long-term debt and capital leases 14,821 15,716    
Nuclear decommissioning reserve 274 269    
Nuclear decommissioning trust liability 410 415    
Deferred income taxes 17 21    
Derivative instruments 285 197    
Out-of-market contracts, net 195 207    
Non-current liabilities held-for-sale 12 8    
Other non-current liabilities 1,130 1,122    
Total non-current liabilities 17,144 17,955    
Total Liabilities 20,807 21,272    
Redeemable noncontrolling interest in subsidiaries 69 78    
Total Stockholders’ Equity 2,071 1,968    
Total Liabilities and Stockholders’ Equity 22,947 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 (37) (58)    
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate (1,396) (594)    
Current assets held-for-sale 0 0    
Prepayments and other current assets (2) 0    
Total current assets (1,435) (652)    
Property, plant and equipment, net (23) (25)    
Other Assets        
Investment in subsidiaries (8,597) (7,847)    
Equity investments in affiliates 0 0    
Notes receivable, less current portion 0 (38)    
Goodwill 0 0    
Intangible assets, net (3) (3)    
Nuclear decommissioning trust fund 0 0    
Derivative instruments (2) 0    
Deferred income tax 0 0    
Non-current assets held-for-sale 0 0    
Other non-current assets 0 0    
Total other assets (8,602) (7,888)    
Total Assets (10,060) (8,565)    
Current Liabilities        
Current portion of long-term debt and capital leases (2) (38)    
Accounts payable 0 0    
Accounts payable - affiliate (1,396) (593)    
Derivative instruments (37) (58)    
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 (1,435) (689)    
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 (2) 0    
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 (2) 0    
Total Liabilities (1,437) (689)    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity (8,623) (7,876)    
Total Liabilities and Stockholders’ Equity (10,060) (8,565)    
Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 71 0    
Funds deposited by counterparties 71 37    
Restricted cash 9 4    
Accounts receivable, net 1,094 912    
Inventory 309 338    
Derivative instruments 837 646    
Cash collateral paid in support of energy risk management activities 209 170    
Accounts receivable - affiliate 1,189 685    
Current assets held-for-sale 0 8    
Prepayments and other current assets 173 122    
Total current assets 3,962 2,922    
Property, plant and equipment, net 2,402 2,507    
Other Assets        
Investment in subsidiaries 486 266    
Equity investments in affiliates 0 0    
Notes receivable, less current portion 0 0    
Goodwill 360 360    
Intangible assets, net 415 454    
Nuclear decommissioning trust fund 694 692    
Derivative instruments 329 126    
Deferred income tax 156 377    
Non-current assets held-for-sale 0 0    
Other non-current assets 81 50    
Total other assets 2,521 2,325    
Total Assets 8,885 7,754    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 699 610    
Accounts payable - affiliate 1,901 742    
Derivative instruments 695 556    
Cash collateral received in support of energy risk management activities 72 37    
Current liabilities held-for-sale 0 0    
Accrued expenses and other current liabilities 270 303    
Accrued expenses and other current liabilities-affiliate 0 0    
Total current liabilities 3,637 2,248    
Other Liabilities        
Long-term debt and capital leases 245 244    
Nuclear decommissioning reserve 274 269    
Nuclear decommissioning trust liability 410 415    
Deferred income taxes 112 112    
Derivative instruments 237 136    
Out-of-market contracts, net 58 66    
Non-current liabilities held-for-sale 0 0    
Other non-current liabilities 410 410    
Total non-current liabilities 1,746 1,652    
Total Liabilities 5,383 3,900    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity 3,502 3,854    
Total Liabilities and Stockholders’ Equity 8,885 7,754    
Non-Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 395 348    
Funds deposited by counterparties 0 0    
Restricted cash 277 504    
Accounts receivable, net 274 163    
Inventory 176 194    
Derivative instruments 36 29    
Cash collateral paid in support of energy risk management activities 15 1    
Accounts receivable - affiliate 123 133    
Current assets held-for-sale 100 107    
Prepayments and other current assets 122 112    
Total current assets 1,518 1,591    
Property, plant and equipment, net 10,164 11,188    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 1,055 1,036    
Notes receivable, less current portion 15 2    
Goodwill 179 179    
Intangible assets, net 1,448 1,295    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 61 15    
Deferred income tax 34 (7)    
Non-current assets held-for-sale 50 43    
Other non-current assets 454 459    
Total other assets 3,296 3,022    
Total Assets 14,978 15,801    
Current Liabilities        
Current portion of long-term debt and capital leases 862 667    
Accounts payable 230 216    
Accounts payable - affiliate (207) (297)    
Derivative instruments 51 57    
Cash collateral received in support of energy risk management activities 0 0    
Current liabilities held-for-sale 74 72    
Accrued expenses and other current liabilities 123 162    
Accrued expenses and other current liabilities-affiliate 0 0    
Total current liabilities 1,133 877    
Other Liabilities        
Long-term debt and capital leases 7,428 8,733    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes 64 64    
Derivative instruments 50 61    
Out-of-market contracts, net 137 141    
Non-current liabilities held-for-sale 12 8    
Other non-current liabilities 311 321    
Total non-current liabilities 8,002 9,328    
Total Liabilities 9,135 10,205    
Redeemable noncontrolling interest in subsidiaries 69 78    
Total Stockholders’ Equity 5,774 5,518    
Total Liabilities and Stockholders’ Equity 14,978 15,801    
NRG Energy, Inc. (Note Issuer)        
Current Assets        
Cash and cash equivalents 514 643    
Funds deposited by counterparties 0 0    
Restricted cash 0 0    
Accounts receivable, net 3 4    
Inventory 0 0    
Derivative instruments 15 9    
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate 141 (129)    
Current assets held-for-sale 0 0    
Prepayments and other current assets 35 27    
Total current assets 708 554    
Property, plant and equipment, net 231 238    
Other Assets        
Investment in subsidiaries 8,111 7,581    
Equity investments in affiliates 0 2    
Notes receivable, less current portion 0 38    
Goodwill 0 0    
Intangible assets, net 0 0    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 38 31    
Deferred income tax (64) (236)    
Non-current assets held-for-sale 0 0    
Other non-current assets 120 120    
Total other assets 8,205 7,536    
Total Assets 9,144 8,328    
Current Liabilities        
Current portion of long-term debt and capital leases 92 59    
Accounts payable 46 55    
Accounts payable - affiliate (269) 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 326 425    
Accrued expenses and other current liabilities-affiliate 133 161    
Total current liabilities 328 881    
Other Liabilities        
Long-term debt and capital leases 7,148 6,739    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes (159) (155)    
Derivative instruments 0 0    
Out-of-market contracts, net 0 0    
Non-current liabilities held-for-sale 0 0    
Other non-current liabilities 409 391    
Total non-current liabilities 7,398 6,975    
Total Liabilities 7,726 7,856    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity 1,418 472    
Total Liabilities and Stockholders’ Equity $ 9,144 $ 8,328