Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Income and Expenses [Abstract]
Interest income	$ 14	$ 4	$ 1
Foreign currency exchange losses, net	(9)	(29)	(1)
Other	2	6	(2)
Other income (expense), net	$ 7	$ (19)	$ (2)