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Plant, Property and Equipment - 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]
Unamortized capitalized computer software costs	$ 108	$ 155
Amortization of capitalized computer software costs	$ 33	$ 32	$ 36

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.