CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 365	$ 219
Other comprehensive income (loss):
Foreign currency translation adjustments	188	22
Derivative instrument adjustments, net of tax	(2)	(5)
Unrealized (loss) gain on available-for-sale securities, net of tax	(1)	1
Reclassification of losses, net of tax	0	1
Total other comprehensive income, net of tax	185	19
Comprehensive income	$ 550	$ 238