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Schedule of Other Current Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Schedule Of Other Current Assets [Abstract] |  |
Prepaid expenses | $ 241 | $ 196
Sales and use tax | 180 | 174
Other | 183 | 163
Total other current assets | $ 604 | $ 533

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