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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current Assets          
Cash and cash equivalents $ 345   $ 563 $ 770  
Funds deposited by counterparties 32   33 37  
Restricted cash 8   17 279  
Accounts receivable, net 1,025   1,024    
Inventory 383   412    
Derivative instruments 860   764    
Cash collateral posted in support of energy risk management activities 190   287    
Prepayments and other current assets 245   302    
Current assets - held-for-sale 0   1    
Current assets - discontinued operations 0   197    
Total current assets 3,088   3,600    
Property, plant and equipment, net 2,593   3,048    
Other Assets          
Investment in subsidiaries 0   0    
Equity investments in affiliates 388   412    
Operating lease right-of-use assets, net 464 $ 404      
Goodwill 579   573    
Intangible assets, net 789   591    
Nuclear decommissioning trust fund 794   663    
Derivative instruments 310   317    
Deferred income taxes 3,286   46    
Other non-current assets 240   289    
Non-current assets - held-for-sale 0   77    
Non-current assets - discontinued operations 0   1,012    
Total other assets 6,850   3,980    
Total Assets 12,531   10,628    
Current Liabilities          
Current portion of long-term debt and finance leases 88   72    
Current portion of operating lease liabilities 73        
Accounts payable  722   863    
Derivative instruments 781   673    
Cash collateral received in support of energy risk management activities 32   33    
Accrued expenses and other current liabilities 663   680    
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current     5    
Current liabilities - discontinued operations 0   72    
Total current liabilities 2,359   2,398    
Other Liabilities          
Long-term debt and finance leases 5,803   6,449    
Non-current operating lease liabilities 483        
Nuclear decommissioning reserve 298   282    
Nuclear decommissioning trust liability 487   371    
Derivative instruments 322   304    
Deferred income taxes 17   65    
Other non-current liabilities 1,084   1,274    
Non-current liabilities - held-for-sale     65    
Non-current liabilities - discontinued operations 0   635    
Total other liabilities 8,494   9,445    
Total Liabilities 10,853   11,843    
Redeemable noncontrolling interest in subsidiaries 20   19 78 $ 46
Total Stockholders' Equity 1,658   (1,234) $ 1,968 $ 4,446
Total Liabilities and Stockholders' Equity 12,531   10,628    
Eliminations          
Current Assets          
Cash and cash equivalents 0   0    
Funds deposited by counterparties 0   0    
Restricted cash 0   0    
Accounts receivable, net (740)   (754)    
Inventory 0   0    
Derivative instruments (41)   (81)    
Cash collateral posted in support of energy risk management activities 0   0    
Prepayments and other current assets 0   0    
Current assets - held-for-sale     0    
Current assets - discontinued operations     0    
Total current assets (781)   (835)    
Property, plant and equipment, net 0   0    
Other Assets          
Investment in subsidiaries (5,495)   (5,153)    
Equity investments in affiliates 0   0    
Operating lease right-of-use assets, net 0        
Goodwill 0   0    
Intangible assets, net 0   0    
Nuclear decommissioning trust fund 0   0    
Derivative instruments (13)   (5)    
Deferred income taxes 0   0    
Other non-current assets 0   (12)    
Non-current assets - held-for-sale     0    
Non-current assets - discontinued operations     0    
Total other assets (5,508)   (5,170)    
Total Assets (6,289)   (6,005)    
Current Liabilities          
Current portion of long-term debt and finance leases 0   0    
Current portion of operating lease liabilities 0        
Accounts payable  (740)   (754)    
Derivative instruments (41)   (81)    
Cash collateral received in support of energy risk management activities 0   0    
Accrued expenses and other current liabilities 0   0    
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current     0    
Current liabilities - discontinued operations     0    
Total current liabilities (781)   (835)    
Other Liabilities          
Long-term debt and finance leases 0   (12)    
Non-current operating lease liabilities 0        
Nuclear decommissioning reserve 0   0    
Nuclear decommissioning trust liability 0   0    
Derivative instruments (13)   (5)    
Deferred income taxes 0   0    
Other non-current liabilities 0   0    
Non-current liabilities - held-for-sale     0    
Non-current liabilities - discontinued operations     0    
Total other liabilities (13)   (17)    
Total Liabilities (794)   (852)    
Redeemable noncontrolling interest in subsidiaries 0   0    
Total Stockholders' Equity (5,495)   (5,153)    
Total Liabilities and Stockholders' Equity (6,289)   (6,005)    
Guarantor Subsidiaries          
Current Assets          
Cash and cash equivalents 0   55    
Funds deposited by counterparties 32   33    
Restricted cash 5   7    
Accounts receivable, net 1,293   1,354    
Inventory 272   278    
Derivative instruments 856   779    
Cash collateral posted in support of energy risk management activities 182   275    
Prepayments and other current assets 170   180    
Current assets - held-for-sale     0    
Current assets - discontinued operations     177    
Total current assets 2,810   3,138    
Property, plant and equipment, net 1,483   1,938    
Other Assets          
Investment in subsidiaries 710   446    
Equity investments in affiliates 0   0    
Operating lease right-of-use assets, net 81        
Goodwill 359   359    
Intangible assets, net 375   422    
Nuclear decommissioning trust fund 794   663    
Derivative instruments 308   296    
Deferred income taxes 421   6    
Other non-current assets 145   133    
Non-current assets - held-for-sale     0    
Non-current assets - discontinued operations     405    
Total other assets 3,193   2,730    
Total Assets 7,486   7,806    
Current Liabilities          
Current portion of long-term debt and finance leases 0   0    
Current portion of operating lease liabilities 20        
Accounts payable  918   1,368    
Derivative instruments 797   713    
Cash collateral received in support of energy risk management activities 32   33    
Accrued expenses and other current liabilities 280   291    
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current     0    
Current liabilities - discontinued operations     24    
Total current liabilities 2,047   2,429    
Other Liabilities          
Long-term debt and finance leases 302   244    
Non-current operating lease liabilities 64        
Nuclear decommissioning reserve 298   282    
Nuclear decommissioning trust liability 487   371    
Derivative instruments 334   306    
Deferred income taxes 0   112    
Other non-current liabilities 399   402    
Non-current liabilities - held-for-sale     0    
Non-current liabilities - discontinued operations     58    
Total other liabilities 1,884   1,775    
Total Liabilities 3,931   4,204    
Redeemable noncontrolling interest in subsidiaries 0   0    
Total Stockholders' Equity 3,555   3,602    
Total Liabilities and Stockholders' Equity 7,486   7,806    
Non-Guarantor Subsidiaries          
Current Assets          
Cash and cash equivalents 20   28    
Funds deposited by counterparties 0   0    
Restricted cash 1   10    
Accounts receivable, net 239   115    
Inventory 111   134    
Derivative instruments 45   50    
Cash collateral posted in support of energy risk management activities 8   12    
Prepayments and other current assets 8   32    
Current assets - held-for-sale     1    
Current assets - discontinued operations     20    
Total current assets 432   402    
Property, plant and equipment, net 952   957    
Other Assets          
Investment in subsidiaries 0   0    
Equity investments in affiliates 388   412    
Operating lease right-of-use assets, net 261        
Goodwill 220   214    
Intangible assets, net 414   169    
Nuclear decommissioning trust fund 0   0    
Derivative instruments 15   4    
Deferred income taxes (19)   (143)    
Other non-current assets 30   71    
Non-current assets - held-for-sale     77    
Non-current assets - discontinued operations     607    
Total other assets 1,309   1,411    
Total Assets 2,693   2,770    
Current Liabilities          
Current portion of long-term debt and finance leases 5   55    
Current portion of operating lease liabilities 32        
Accounts payable  141   (185)    
Derivative instruments 25   41    
Cash collateral received in support of energy risk management activities 0   0    
Accrued expenses and other current liabilities 44   36    
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current     5    
Current liabilities - discontinued operations     48    
Total current liabilities 247   0    
Other Liabilities          
Long-term debt and finance leases 28   192    
Non-current operating lease liabilities 301        
Nuclear decommissioning reserve 0   0    
Nuclear decommissioning trust liability 0   0    
Derivative instruments 1   3    
Deferred income taxes 17   61    
Other non-current liabilities 153   320    
Non-current liabilities - held-for-sale     65    
Non-current liabilities - discontinued operations     577    
Total other liabilities 500   1,218    
Total Liabilities 747   1,218    
Redeemable noncontrolling interest in subsidiaries 20   19    
Total Stockholders' Equity 1,926   1,533    
Total Liabilities and Stockholders' Equity 2,693   2,770    
NRG Energy, Inc.          
Current Assets          
Cash and cash equivalents 325   480    
Funds deposited by counterparties 0   0    
Restricted cash 2   0    
Accounts receivable, net 233   309    
Inventory 0   0    
Derivative instruments 0   16    
Cash collateral posted in support of energy risk management activities 0   0    
Prepayments and other current assets 67   90    
Current assets - held-for-sale     0    
Current assets - discontinued operations     0    
Total current assets 627   895    
Property, plant and equipment, net 158   153    
Other Assets          
Investment in subsidiaries 4,785   4,707    
Equity investments in affiliates 0   0    
Operating lease right-of-use assets, net 122        
Goodwill 0   0    
Intangible assets, net 0   0    
Nuclear decommissioning trust fund 0   0    
Derivative instruments 0   22    
Deferred income taxes 2,884   183    
Other non-current assets 65   97    
Non-current assets - held-for-sale     0    
Non-current assets - discontinued operations     0    
Total other assets 7,856   5,009    
Total Assets 8,641   6,057    
Current Liabilities          
Current portion of long-term debt and finance leases 83   17    
Current portion of operating lease liabilities 21        
Accounts payable  403   434    
Derivative instruments 0   0    
Cash collateral received in support of energy risk management activities 0   0    
Accrued expenses and other current liabilities 339   353    
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current     0    
Current liabilities - discontinued operations     0    
Total current liabilities 846   804    
Other Liabilities          
Long-term debt and finance leases 5,473   6,025    
Non-current operating lease liabilities 118        
Nuclear decommissioning reserve 0   0    
Nuclear decommissioning trust liability 0   0    
Derivative instruments 0   0    
Deferred income taxes 0   (108)    
Other non-current liabilities 532   552    
Non-current liabilities - held-for-sale     0    
Non-current liabilities - discontinued operations     0    
Total other liabilities 6,123   6,469    
Total Liabilities 6,969   7,273    
Redeemable noncontrolling interest in subsidiaries 0   0    
Total Stockholders' Equity 1,672   (1,216)    
Total Liabilities and Stockholders' Equity $ 8,641   $ 6,057