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Related Party Transactions (Schedule of related Party Transactions) (Details) - Affiliated Entity - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Interest Income | $ 21 | $ 14 | $ 8
Interest expense | 74 | 54 | 36
Electricity, Generation [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue—Non-Regulated | 1,544 | 1,533 | 1,297
Cost of Sales—Non-Regulated | $ 531 | $ 342 | $ 220

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