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Schedule of Other Current Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Schedule Of Other Current Assets [Abstract] |  |
Prepaid expenses | $ 196 | $ 212
Sales and use tax | 174 | 153
Other | 163 | 154
Total other current assets | $ 533 | $ 519

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