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Other Current Assets - (Schedule of Other Current Assets) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Sales and use tax	$ 223	$ 108
Prepaid expenses	200	174
Other	152	123
Total other current assets	$ 575	$ 405

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

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