Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net revenue:
Product	$ 536	$ 350	$ 1,293	$ 893
Service and other	454	345	911	751
Total net revenue	990	695	2,204	1,644
Cost of revenue:
Product	347	341	599	471
Service and other	80	72	195	136
Total cost of revenue	427	413	794	607
Gross profit	563	282	1,410	1,037
Operating expenses:
Research and development	261	283	526	561
Marketing and sales	183	164	313	311
General and administrative	92	129	180	214
Acquisition-related contingent consideration	(1)	(44)	(2)	(37)
Amortization of intangibles	4	4	7	8
Restructuring and other charges	0	(2)	0	(1)
Total operating expenses	539	534	1,024	1,056
Operating income (loss)	24	(252)	386	(19)
Interest and other income (expense), net	(6)	(8)	(14)	(13)
Income (loss) before provision for income taxes	18	(260)	372	(32)
Provision for income taxes	15	13	34	19
Net income (loss)	$ 3	$ (273)	$ 338	$ (51)
Net income (loss) per share:
Basic	$ 0.01	$ (0.89)	$ 1.08	$ (0.17)
Diluted	$ 0.01	$ (0.89)	$ 1.05	$ (0.17)
Number of shares used in computation:
Basic	313	308	312	306
Diluted	322	308	322	306