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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative
Notional amount of foreign exchange forward contracts	$ 95		$ 140
Notional amount of foreign exchange forward contracts on a net basis	26		53
Fair value derivative liabilities	0		0
Fair value derivative assets	0		0
Fair value gain (loss) on foreign currency forward contracts	$ 0	$ 0

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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