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Other Income and Expense (Other Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of other operating expense [Line Items] |  |  |  |  |
Gain (Loss) on Disposition of Assets | $ (27) |  | $ (43) | $ (38) |
Allowance for other receivables | 7 |  | 0 | 52 | [1]
Loss On Sale And Disposal Of Assets | 30 | [2] | 28 | 12 |
Water Rights Write-Off | 0 |  | 19 | 6 |
Other | 11 |  | 10 | 7 |
Defined Benefit Plan, Other Cost (Credit) | 10 |  | 1 | 3 |
Other Expenses | 58 |  | $ 58 | $ 80 |
Other Expense [Member] |  |  |  |  |
Schedule of other operating expense [Line Items] |  |  |  |  |
Gain (Loss) on Disposition of Assets | $ 20 |  |  |  |
[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 was related to certain reimbursements the Company was expecting in connection with a legal matter.
[2] | In September 2018, the Company recorded a $20 million loss due to damage associated with a lightning incident at the Andres facility in the Dominican Republic

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