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Roll Forward of Restructuring Reserve (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restructuring Reserve [Roll Forward]
Expenses	$ (2)
Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	0
Expenses	4
Cash Payments	(4)
Restructuring Reserve	$ 0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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