Other Income and Expense (Nonoperating Income) (Details) - USD ($) $ in Millions |
12 Months Ended | |||||
---|---|---|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||||||
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset | $ 0 | $ 0 | ||||
Total other income | $ 72 | 120 | 64 | |||
Other Income [Member] | ||||||
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||||||
Litigation Settlement, Amount Awarded from Other Party | 0 | 60 | [1] | 0 | ||
Public Utilities, Allowance for Funds Used During Construction, Additions | 8 | 26 | 29 | |||
Gain (Loss) on Disposition of Other Assets | 4 | 1 | 4 | |||
Other | 28 | 33 | 31 | |||
Total other income | $ 72 | $ 120 | $ 64 | |||
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