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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 12, 2017
Related Party Transaction [Line Items]            
Service fees     $ 44 $ 32 $ 8  
Other income - affiliate   $ 84 0 0 87  
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