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Condensed Consolidating Financial Information - BALANCE SHEETS (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Current Assets        
Cash and cash equivalents $ 1,359 $ 767 $ 1,022 $ 591
Funds deposited by counterparties 30 37 31 2
Restricted cash 28 279 $ 318 $ 267
Accounts receivable, net 1,297 960    
Inventory 408 486    
Derivative instruments 683 624    
Deferred income tax 0      
Cash collateral paid in support of energy risk management activities 209 171    
Accounts receivable - affiliate 19 186    
Prepayments and other current assets 248 179    
Current assets - held for sale 0 116    
Current assets - discontinued operations 4 705    
Total current assets 4,285 4,510    
Property, plant and equipment, net 3,599 6,435    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 452 182    
Notes receivable, less current portion 10 2    
Goodwill 539 539    
Intangible assets, net 602 507    
Nuclear decommissioning trust fund 719 692    
Derivative instruments 392 159    
Deferred income tax 11 6    
Other non-current assets 281 294    
Non-current assets held-for-sale 0 43    
Non-current assets - discontinued operations 560 10,181    
Total other assets 3,566 12,605    
Total Assets 11,450 23,550    
Current Liabilities        
Current portion of long-term debt and capital leases 593 204    
Accounts payable 824 711    
Accounts payable - affiliate 14 57    
Derivative instruments 550 537    
Deferred Tax Liabilities, Net, Current 0      
Cash collateral received in support of energy risk management activities 30 37    
Accrued expenses and other current liabilities 659 769    
Accrued expenses and other current liabilities-affiliate 1 161    
Current liabilities - held-for-sale 0 72    
Current liabilities - discontinued operations 52 864    
Total current liabilities 2,723 3,412    
Non-Current Liabilities        
Long-term debt and capital leases 6,658 9,180    
Nuclear decommissioning reserve 278 269    
Nuclear decommissioning trust liability 432 415    
Deferred income taxes 18 21    
Derivative instruments 357 143    
Out-of-market contracts, net 177 195    
Other non-current liabilities 1,177 1,002    
Non-current liabilities - held-for-sale 0 8    
Non-current liabilities - discontinued operations 547 6,859    
Total non-current liabilities 9,644 18,092    
Total Liabilities 12,367 21,504    
Redeemable noncontrolling interest in subsidiaries 19 78    
Total Stockholders’ Equity (936) 1,968    
Total Liabilities and Stockholders’ Equity 11,450 23,550    
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 (45) (57)    
Deferred income tax 0      
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate (1,256) (534)    
Prepayments and other current assets 0 0    
Current assets - held for sale   0    
Current assets - discontinued operations 0 0    
Total current assets (1,301) (591)    
Property, plant and equipment, net 0 (4)    
Other Assets        
Investment in subsidiaries (4,856) (7,847)    
Equity investments in affiliates 0 0    
Notes receivable, less current portion (12) 0    
Goodwill 0 0    
Intangible assets, net 0 (3)    
Nuclear decommissioning trust fund 0 0    
Derivative instruments (10) 0    
Deferred income tax 0 0    
Other non-current assets 0 0    
Non-current assets held-for-sale   0    
Non-current assets - discontinued operations 0 (22)    
Total other assets (4,878) (7,872)    
Total Assets (6,179) (8,467)    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 0 0    
Accounts payable - affiliate (1,257) (534)    
Derivative instruments (45) (57)    
Deferred Tax Liabilities, Net, Current 0      
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 0    
Current liabilities - held-for-sale   0    
Current liabilities - discontinued operations 0 0    
Total current liabilities (1,302) (591)    
Non-Current Liabilities        
Long-term debt and capital leases (12) 0    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes 0 0    
Derivative instruments (10) 0    
Out-of-market contracts, net 0 0    
Other non-current liabilities 0 0    
Non-current liabilities - held-for-sale   0    
Non-current liabilities - discontinued operations 0 0    
Total non-current liabilities (22) 0    
Total Liabilities (1,324) (591)    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity (4,855) (7,876)    
Total Liabilities and Stockholders’ Equity (6,179) (8,467)    
Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 130 0    
Funds deposited by counterparties 30 37    
Restricted cash 5 4    
Accounts receivable, net 1,151 911    
Inventory 301 338    
Derivative instruments 687 646    
Deferred income tax 38      
Cash collateral paid in support of energy risk management activities 194 170    
Accounts receivable - affiliate 458 685    
Prepayments and other current assets 160 122    
Current assets - held for sale   8    
Current assets - discontinued operations 0 0    
Total current assets 3,154 2,921    
Property, plant and equipment, net 2,372 2,507    
Other Assets        
Investment in subsidiaries 477 266    
Equity investments in affiliates 0 0    
Notes receivable, less current portion 0 0    
Goodwill 359 360    
Intangible assets, net 403 455    
Nuclear decommissioning trust fund 719 692    
Derivative instruments 357 126    
Deferred income tax 34 377    
Other non-current assets 92 50    
Non-current assets held-for-sale   0    
Non-current assets - discontinued operations 0 0    
Total other assets 2,441 2,326    
Total Assets 7,967 7,754    
Current Liabilities        
Current portion of long-term debt and capital leases 0 0    
Accounts payable 705 609    
Accounts payable - affiliate 1,610 742    
Derivative instruments 565 556    
Deferred Tax Liabilities, Net, Current 0      
Cash collateral received in support of energy risk management activities 30 37    
Accrued expenses and other current liabilities 282 304    
Accrued expenses and other current liabilities-affiliate 0 0    
Current liabilities - held-for-sale   0    
Current liabilities - discontinued operations 0 0    
Total current liabilities 3,192 2,248    
Non-Current Liabilities        
Long-term debt and capital leases 244 244    
Nuclear decommissioning reserve 278 269    
Nuclear decommissioning trust liability 432 415    
Deferred income taxes 112 112    
Derivative instruments 361 136    
Out-of-market contracts, net 54 66    
Other non-current liabilities 410 410    
Non-current liabilities - held-for-sale   0    
Non-current liabilities - discontinued operations 0 0    
Total non-current liabilities 1,891 1,652    
Total Liabilities 5,083 3,900    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity 2,884 3,854    
Total Liabilities and Stockholders’ Equity 7,967 7,754    
Non-Guarantor Subsidiaries        
Current Assets        
Cash and cash equivalents 22 124    
Funds deposited by counterparties 0 0    
Restricted cash 15 275    
Accounts receivable, net 97 45    
Inventory 107 148    
Derivative instruments 24 26    
Deferred income tax 80      
Cash collateral paid in support of energy risk management activities 15 1    
Accounts receivable - affiliate 55 183    
Prepayments and other current assets 35 30    
Current assets - held for sale   108    
Current assets - discontinued operations 4 705    
Total current assets 454 1,645    
Property, plant and equipment, net 1,077 3,695    
Other Assets        
Investment in subsidiaries 0 0    
Equity investments in affiliates 452 180    
Notes receivable, less current portion 10 2    
Goodwill 180 179    
Intangible assets, net 199 55    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 9 2    
Deferred income tax (149) (135)    
Other non-current assets 70 124    
Non-current assets held-for-sale   43    
Non-current assets - discontinued operations 560 10,203    
Total other assets 1,331 10,653    
Total Assets 2,862 15,993    
Current Liabilities        
Current portion of long-term debt and capital leases 89 183    
Accounts payable 55 47    
Accounts payable - affiliate (191) (332)    
Derivative instruments 30 38    
Deferred Tax Liabilities, Net, Current 1      
Cash collateral received in support of energy risk management activities 0 0    
Accrued expenses and other current liabilities 40 64    
Accrued expenses and other current liabilities-affiliate 0 0    
Current liabilities - held-for-sale   72    
Current liabilities - discontinued operations 52 859    
Total current liabilities 76 931    
Non-Current Liabilities        
Long-term debt and capital leases 244 2,197    
Nuclear decommissioning reserve 0 0    
Nuclear decommissioning trust liability 0 0    
Deferred income taxes 62 64    
Derivative instruments 6 7    
Out-of-market contracts, net 123 129    
Other non-current liabilities 197 201    
Non-current liabilities - held-for-sale   8    
Non-current liabilities - discontinued operations 547 6,859    
Total non-current liabilities 1,179 9,465    
Total Liabilities 1,255 10,396    
Redeemable noncontrolling interest in subsidiaries 19 78    
Total Stockholders’ Equity 1,588 5,519    
Total Liabilities and Stockholders’ Equity 2,862 15,993    
NRG Energy, Inc. (Note Issuer)        
Current Assets        
Cash and cash equivalents 1,207 643    
Funds deposited by counterparties 0 0    
Restricted cash 8 0    
Accounts receivable, net 49 4    
Inventory 0 0    
Derivative instruments 17 9    
Deferred income tax (118)      
Cash collateral paid in support of energy risk management activities 0 0    
Accounts receivable - affiliate 762 (148)    
Prepayments and other current assets 53 27    
Current assets - held for sale   0    
Current assets - discontinued operations 0 0    
Total current assets 1,978 535    
Property, plant and equipment, net 150 237    
Other Assets        
Investment in subsidiaries 4,379 7,581    
Equity investments in affiliates 0 2    
Notes receivable, less current portion 12 0    
Goodwill 0 0    
Intangible assets, net 0 0    
Nuclear decommissioning trust fund 0 0    
Derivative instruments 36 31    
Deferred income tax 126 (236)    
Other non-current assets 119 120    
Non-current assets held-for-sale   0    
Non-current assets - discontinued operations 0 0    
Total other assets 4,672 7,498    
Total Assets 6,800 8,270    
Current Liabilities        
Current portion of long-term debt and capital leases 504 21    
Accounts payable 64 55    
Accounts payable - affiliate (148) 181    
Derivative instruments 0 0    
Deferred Tax Liabilities, Net, Current (1)      
Cash collateral received in support of energy risk management activities 0 0    
Accrued expenses and other current liabilities 337 401    
Accrued expenses and other current liabilities-affiliate 1 161    
Current liabilities - held-for-sale   0    
Current liabilities - discontinued operations 0 5    
Total current liabilities 757 824    
Non-Current Liabilities        
Long-term debt and capital leases 6,182 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    
Other non-current liabilities 570 391    
Non-current liabilities - held-for-sale   0    
Non-current liabilities - discontinued operations 0 0    
Total non-current liabilities 6,596 6,975    
Total Liabilities 7,353 7,799    
Redeemable noncontrolling interest in subsidiaries 0 0    
Total Stockholders’ Equity (553) 471    
Total Liabilities and Stockholders’ Equity $ 6,800 $ 8,270