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Other Income and Expense - Other Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Schedule of Other Nonoperating Income [Line Items] |  |
Other income | $ 30 | $ 13
Other Income [Member] |  |
Schedule of Other Nonoperating Income [Line Items] |  |
Insured Event, Gain (Loss) | 23 | 0
Public Utilities, Allowance for Funds Used During Construction, Additions | 1 | 5
Other Nonoperating Income | 30 | 13
Other income | $ 6 | $ 8

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