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Other Income and Expense - Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule of Other Nonoperating Income [Line Items] |  |  |  |
Other income | $ 12 | $ 15 | $ 25 | $ 30
Other Income [Member] |  |  |  |
Schedule of Other Nonoperating Income [Line Items] |  |  |  |
Public Utilities, Allowance for Funds Used During Construction, Additions | 7 | 3 | 14 | 7
Gain On Sale Of Assets | 1 | 6 | 3 | 11
Other Nonoperating Income | $ 4 | $ 6 | $ 8 | $ 12

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