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Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of other expense [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ (34) | $ (26)
Other Expenses | $ 47 | $ 13 | 95 | 42
Other Expense [Member] |  |  |  |
Schedule of other expense [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets | 16 | 12 | 54 | 26
Water Rights Write-Off | 15 | 0 | 18 | 7
Allowance for other receivables | 15 | 0 | 15 | 0
Legal settlement | 1 | 1 | 2 | 5
Other Nonoperating Expense | 0 | 0 | 6 | 4
Other Expenses | $ 47 | $ 13 | $ 95 | $ 42

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