CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 892	$ 835	$ 1,010
Other comprehensive income (loss):
Foreign currency translation adjustment	(326)	(371)	93
Unrealized losses on forward contracts designated as hedges, net of tax	(4)	0	0
Unrealized gains on investments, net of tax	0	0	1
Other comprehensive income (loss)	(330)	(371)	94
Comprehensive Income	$ 562	$ 464	$ 1,104