Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 442	$ 335
Other comprehensive income (loss), net of tax:
Change in unrealized net gains and losses on available-for-sale securities	(1)	0
Change in unrealized net gains and losses on derivative instruments	(13)	(1)
Reclassification adjustment for net realized gains and losses on derivative instruments	(3)	5
Foreign currency translation adjustments	1	20
Total other comprehensive income (loss), net of tax	(16)	24
Total comprehensive income	$ 426	$ 359