Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net revenue:
Product	$ 703	$ 884	$ 1,886	$ 2,370
Service and other	219	177	702	405
Total net revenue	922	1,061	2,588	2,775
Cost of revenue:
Product	363	477	866	1,088
Service and other	66	75	213	136
Total cost of revenue	429	552	1,079	1,224
Gross profit	493	509	1,509	1,551
Operating expenses:
Research and development	286	325	890	928
Marketing and sales	214	269	571	631
General and administrative	68	98	253	260
Acquisition-related contingent consideration	(45)	(11)	(65)	8
Amortization of intangibles	7	11	21	37
Restructuring and other charges	2	0	27	17
Total operating expenses	532	692	1,697	1,881
Operating loss	(39)	(183)	(188)	(330)
Gain on strategic investments, net	14	0	14	0
Interest and other income (expense), net	(8)	(10)	(17)	(13)
Loss before provision for (benefit from) income taxes	(33)	(193)	(191)	(343)
Provision for (benefit from) income taxes	12	12	34	(19)
Net Loss	$ (45)	$ (205)	$ (225)	$ (324)
Net loss per share:
Basic and Diluted	$ (0.15)	$ (0.62)	$ (0.72)	$ (0.98)
Number of shares used in computation:
Basic and Diluted	304	332	313	331