Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 10	$ (3)	$ (20)
Unrealized gains (losses), tax	(5)	1	3
Reclassification adjustment for losses (gains) included in other income (expense), net, tax	$ 0	$ (1)	$ (1)