CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 240	$ 192	$ 447	$ 364
Other comprehensive (loss) income:
Foreign currency translation adjustments	7	0	(19)	0
Derivative instrument adjustments, net of tax	(2)	0	7	1
Unrealized (loss) gain on available-for-sale securities, net of tax	(1)	1	(2)	2
Reclassification of losses (gains), net of tax	(2)	1	(4)	2
Total other comprehensive (loss) income, net of tax	2	2	(18)	5
Comprehensive income	$ 242	$ 194	$ 429	$ 369