CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 127	$ 212	$ 463	$ 606
Other comprehensive income (loss):
Foreign currency translation adjustment	(16)	85	(20)	(245)
Unrealized gains (losses) on forward contracts designated as hedges, net of tax	9	(8)	4	6
Unrealized losses on investments, net of tax	0	(3)	0	(3)
Total other comprehensive income (loss)	(7)	74	(16)	(242)
Comprehensive income	$ 120	$ 286	$ 447	$ 364