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Schedule of Other Current Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure Schedule Of Other Current Assets [Abstract] |  |
Prepaid expenses | $ 192 | $ 192
Sales and use tax | 159 | 125
Other | 156 | 139
Total other current assets | $ 507 | $ 456

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