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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Other Financial Data [Abstract] |  |
Taxes receivable | $ 114 | $ 100
Prepaid expenses | 126 | 102
Receivables from the Divested Business | 28 | 0
Other | 21 | 45
Total other current assets | $ 289 | $ 247

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