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Acquisitions, Discontinued Operations and Dispositions - GenOn Settlement and Plan Confirmation (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 16, 2018
Apr. 27, 2018
Dec. 31, 2017
Dec. 14, 2018
GenOn Mid-Atlantic | Restructuring Support Agreement | Letter of Credit | Intercompany Credit Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Letters of credit facility   $ 38    
Services Agreement | GenOn | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Collateral posted $ 15      
GenOn        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Settlement consideration 261      
Deduction for GenOn tax losses       $ 9,500
Professional fees   $ 6    
GenOn | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Settlement payment 125      
GenOn | Services Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Credit applied     $ 28  
GenOn | Services Agreement | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Credit applied 28      
Remaining payments and other balances due under settlement agreement 10      
GenOn | Revolving Credit Facility Borrowings | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Intercompany secured revolving credit facility and accrued interest and fees 151      
GenOn | Accrued Interest On Borrowings | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Intercompany secured revolving credit facility and accrued interest and fees 12      
GenOn | Reduction Of Settlement Payment        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Remaining payments and other balances due under settlement agreement 4      
GenOn | Assignment Of Historical Claims Against REMA        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Remaining payments and other balances due under settlement agreement 8      
GenOn | Other | Restructuring Support Agreement        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Remaining payments and other balances due under settlement agreement $ 2