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Property and Equipment Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Capitalized software development costs, net of accumulated amortization	$ 257	$ 184
Amortization of capitalized software development costs	$ 100	$ 73	$ 61

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.