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Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of other expense [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ (2) | $ (19)
Other Expenses | $ 4 | $ 7 | 13 | 31
Other Expense [Member] |  |  |  |
Schedule of other expense [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets | 3 | 0 | 5 | 21
Water Rights Write-Off | 0 | 3 | 0 | 3
Defined Benefit Plan, Other Cost (Credit) |  | (2) | 1 |
Other Nonoperating Expense | 1 | 4 | 8 | 7
Other Expenses | $ 4 | $ 7 | $ 13 | $ 31

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