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Other Income and Expense (Other Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of other operating expense [Line Items] |  |  |  |
Allowance for other receivables | [1] | $ 0 | $ 52 | $ 0
Loss On Sale And Disposal Of Assets |  | 28 | 12 | 0
Water Rights Write-Off |  | 19 | 6 | 10
Other |  | 10 | 9 | 14
Other Expenses |  | $ 57 | $ 79 | $ 24
[1] | During the fourth quarter of 2016, we recognized a full allowance on a non-trade receivable in the MCAC SBU as a result of payment delays and discussions with the counterparty. The allowance relates to certain reimbursements the Company was expecting in connection with a legal matter. Management believes the counterparty is obligated to pay and plans to continue to attempt to fully collect the non-trade receivable.

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