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Schedule of Other Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Current Assets By Type [Line Items]
Prepaid expenses	$ 174	$ 179
Sales and use tax	108	92
Other	123	109
Total other current assets	$ 405	$ 380

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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