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Summary of Significant Accounting Policies - Additional (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Funds Deposited by Counterparties      
Number of months beyond which company can not predict the holding of collateral (in months) 12 months    
Collateral received from GenOn     $ 79
Accounts Receivable, Net [Abstract]      
Allowance for doubtful accounts $ 32 $ 28  
Project Development Costs and Capitalized Interest      
Amount of interest capitalized 7 20 29
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible assets, accumulated amortization $ 1,151 1,573  
Income Taxes      
Unrecognized tax benefits, more-likely-than-not threshold percentage 50.00%    
Lease Revenue      
Lease, term of contract 20 years    
Lessor Accounting      
Contingent rental income $ 104 253 272
Gross Receipts and Sales Taxes      
Gross Receipts Tax 99 92 101
Cost of Energy for Retail Operations      
Transmission and distribution charges not yet billed 105 107 90
Foreign Currency Translation and Transaction Gains and Losses      
Cumulative translation adjustment (13) (2) (11)
Marketing and Advertising Expense      
Advertising expense 73 66 $ 79
Reorganization Costs      
Severance costs $ 90 $ 44  
South Texas Project      
Property, Plant and Equipment      
Ownership Interest (as a percent) 44.00%