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Related Party Transactions (Schedule of related Party Transactions) (Details) - Affiliated Entity - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Interest Income | $ 8 | $ 4 | $ 25
Interest expense | 36 | 39 | 33
Electricity Generation Plant, Non-Nuclear [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue—Non-Regulated | 1,297 | 1,100 | 1,099
Cost of Sales—Non-Regulated | $ 220 | $ 210 | $ 330

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