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Related Party Transactions (Schedule of related Party Transactions) (Details) - Affiliated Entity - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Interest Income $ 20 $ 21 $ 14
Interest expense 131 74 54
Electricity, Generation [Member]      
Related Party Transaction [Line Items]      
Revenue—Non-Regulated 1,506 1,544 1,533
Cost of Sales—Non-Regulated $ 504 $ 531 $ 342