Derivative Instruments and Hedging Activities - Pre-Tax (Loss) Gain (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Total (loss) gain	$ (2)	$ (3)	$ (2)	$ 1
Exchange Contracts [Member]
Derivative [Line Items]
Total (loss) gain	(4)	(4)	3
Forward Contracts [Member]
Derivative [Line Items]
Total (loss) gain	(1)	(1)	1	(2)
Metals Contracts [Member]
Derivative [Line Items]
Total (loss) gain	$ 3	$ 2	$ (6)	$ 3