Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ (20)	$ (30)	$ 20
Unrealized gains (losses), tax	3	(3)	1
Reclassification adjustment for losses (gains) included in other income (expense), net, tax	$ (1)	$ 3	$ 1