CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 426	$ 363
Other comprehensive income (loss):
Foreign currency translation adjustment	19	(5)
Unrealized gains (losses) on forward contracts designated as hedges, net of tax	(15)	(5)
Total other comprehensive income (loss)	4	(10)
Comprehensive income	$ 430	$ 353