Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net revenue:
Product	$ 2,738	$ 3,415	$ 3,181
Service and other	1,059	728	408
Total net revenue	3,797	4,143	3,589
Cost of revenue:
Product	1,085	1,374	1,407
Service and other	303	224	92
Total cost of revenue	1,388	1,598	1,499
Gross profit	2,409	2,545	2,090
Operating expenses:
Research and development	1,153	1,180	1,124
Marketing and sales	788	883	781
General and administrative	354	377	296
Acquisition-related contingent consideration	(64)	11	(17)
Amortization of intangibles	30	43	57
Restructuring and other charges	27	16	161
Total operating expenses	2,288	2,510	2,402
Operating income (loss)	121	35	(312)
Gains on strategic investments, net	39	0	23
Interest and other income (expense), net	(21)	(17)	10
Income (loss) before provsion for (benefit from) income taxes	139	18	(279)
Provision for (benefit from) income taxes	41	(58)	(3)
Net income (loss)	$ 98	$ 76	$ (276)
Net income (loss) per share:
Basic	$ 0.32	$ 0.23	$ (0.84)
Diluted	$ 0.31	$ 0.23	$ (0.84)
Number of shares used in computation:
Basic	310	331	330
Diluted	313	336	330