CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 219	$ 207
Other comprehensive income (loss):
Foreign currency translation adjustments	22	(26)
Derivative instrument adjustments, net of tax	(5)	9
Unrealized gain (loss) on available-for-sale securities, net of tax	1	(1)
Reclassification of losses (gains), net of tax	1	(2)
Total other comprehensive income (loss), net of tax	19	(20)
Comprehensive income	$ 238	$ 187