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Summary of Significant Accounting Policies - Additional (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Funds Deposited by Counterparties        
Number of months beyond which company can not predict the holding of collateral (in months) 12 months      
Accounts Receivable, Net [Abstract]        
Allowance for doubtful accounts $ 43 $ 32    
Project Development Costs and Capitalized Interest        
Amount of interest capitalized 3 7 $ 20  
Finite-Lived Intangible Assets, Net [Abstract]        
Intangible assets, accumulated amortization $ 1,262 1,151    
Lease Revenue        
Lease term 20 years      
Lessor Accounting        
Operating lease income $ 20 21    
Contingent rental income 5 104 253  
Gross Receipts and Sales Taxes        
Gross Receipts Tax 109 99 92  
Cost of Energy for Retail Operations        
Transmission and distribution charges not yet billed 103 105 107  
Foreign Currency Translation and Transaction Gains and Losses        
Cumulative translation adjustment (13) (13) (2)  
Marketing and Advertising Expense        
Advertising expense 66 73 66  
Reorganization Costs        
Reorganization costs 23 $ 90 $ 44  
Operating lease right-of-use assets, net 464     $ 404
Operating lease liability $ 556     $ 321
South Texas Project        
Property, Plant and Equipment        
Ownership Interest (as a percent) 44.00%