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Related Party Transactions - Service Agreement and Transition Service Agreement with GeOn (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 16, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 12, 2017
Related Party Transaction [Line Items]            
Service fees     $ 32 $ 8 $ 7  
Other income - affiliate   $ 84 0 87 $ 193  
Services Agreement | GenOn            
Related Party Transaction [Line Items]            
Credit applied   $ 28        
Services Agreement | Restructuring Support Agreement            
Related Party Transaction [Line Items]            
Shared services annualized rate           $ 84
Services Agreement | Restructuring Support Agreement | GenOn            
Related Party Transaction [Line Items]            
Credit applied $ 28          
Transition Services Agreement | Restructuring Support Agreement | GenOn            
Related Party Transaction [Line Items]            
Other income - affiliate       87    
Shared service, selling, general and administrative     53 $ 42    
Management Service | Services Agreement | GenOn            
Related Party Transaction [Line Items]            
Service fees     $ 193