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Summary of Significant Accounting Policies - Additional (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Funds Deposited by Counterparties      
Number of months beyond which company can not predict the holding of collateral (in months) 12 months    
Project Development Costs and Capitalized Interest      
Amount of interest capitalized $ 2 $ 3 $ 7
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible assets, accumulated amortization $ 1,357 1,262  
Lease Revenue      
Lease term 20 years    
Lessor Accounting      
Operating lease income $ 18 20 21
Contingent rental income     104
Gross Receipts and Sales Taxes      
Gross Receipts Tax 107 109 99
Purchased Energy and Other Cost of Sales for Customer Operations      
Transmission and distribution charges not yet billed 98 103 105
Foreign Currency Translation and Transaction Gains and Losses      
Cumulative translation adjustment (2) (13) (13)
Marketing and Advertising Costs      
Advertising expense 74 66 73
Reorganization Costs      
Reorganization costs $ 0 $ 23 $ 90
South Texas Project      
Property, Plant and Equipment      
Ownership Interest (as a percent) 44.00%