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Other Current Assets - (Schedule of Other Current Assets) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Current Assets By Type [Line Items]
Sales and use tax	$ 191	$ 92
Prepaid expenses	181	179
Other	155	109
Total other current assets	$ 527	$ 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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