Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net income (loss)	$ (45)	$ 142	$ 257	$ 480
Other comprehensive income (loss), net of tax:
Change in unrealized net gains and losses on available-for-sale securities	(4)	(1)	(3)	(1)
Reclassification adjustment for net realized gains and losses on available-for-sale securities	1	(1)	0	(1)
Change in unrealized net gains and losses on derivative instruments	10	1	2	11
Reclassification adjustment for net realized gains and losses on derivative instruments	(4)	1	(11)	8
Foreign currency translation adjustments	(16)	(30)	(47)	(31)
Total other comprehensive income (loss), net of tax	(13)	(30)	(59)	(14)
Total comprehensive income (loss)	$ (58)	$ 112	$ 198	$ 466