Derivative Instruments and Hedging Activities - Pre-Tax (Loss) Gain (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative [Line Items]
Total (loss) gain	$ (5)	$ 3		$ 4
Exchange Contracts [Member]
Derivative [Line Items]
Total (loss) gain		9	7	4
Forward Contracts [Member]
Derivative [Line Items]
Total (loss) gain			2	(1)
Metals Contracts [Member]
Derivative [Line Items]
Total (loss) gain	$ (5)	$ (6)	$ (9)	$ 1