CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 199	$ 127	$ 713	$ 733
Other comprehensive income (loss):
Foreign currency translation adjustment	0	5	(20)	(240)
Unrealized gains (losses) on forward contracts designated as hedges, net of tax	(4)	(3)	0	3
Unrealized losses on investments, net of tax	0	(1)	0	(4)
Total other comprehensive income (loss)	(4)	1	(20)	(241)
Comprehensive income	$ 195	$ 128	$ 693	$ 492