Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Contracts
Total (loss) gain	$ 1	$ (6)
Exchange Contract [Member]
Derivative Contracts
Total (loss) gain	(5)	(8)
Forward Contracts [Member]
Derivative Contracts
Total (loss) gain	(1)	2
Metal Contract [Member]
Derivative Contracts
Total (loss) gain	$ 7