Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net revenue:
Product	$ 625	$ 606	$ 1,802	$ 1,899
Service and other	445	520	1,286	1,431
Total net revenue	1,070	1,126	3,088	3,330
Cost of revenue:
Product	439	300	868	899
Service and other	107	101	260	296
Total cost of revenue	546	401	1,128	1,195
Gross profit	524	725	1,960	2,135
Operating expenses:
Research and development	266	283	827	809
Marketing and sales	190	169	469	482
General and administrative	97	107	296	287
Acquisition-related contingent consideration	0	0	0	(2)
Amortization of intangibles	2	4	6	11
Total operating expenses	555	563	1,598	1,587
Operating income (loss)	(31)	162	362	548
Interest and other income (expense), net	1	(6)	(11)	(20)
Income (loss) before provision for income taxes	(30)	156	351	528
Provision for income taxes	15	14	94	48
Net income (loss)	$ (45)	$ 142	$ 257	$ 480
Earnings (loss) per share:
Basic	$ (0.14)	$ 0.46	$ 0.83	$ 1.54
Diluted	$ (0.14)	$ 0.44	$ 0.77	$ 1.49
Number of shares used in computation:
Basic	311	311	311	312
Diluted	311	323	333	322