Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Net revenue:
Product	$ 547	$ 649	$ 1,829	$ 1,753
Service and other	613	500	1,739	1,565
Total net revenue	1,160	1,149	3,568	3,318
Cost of revenue:
Product	352	389	716	796
Service and other	149	127	328	300
Total cost of revenue	501	516	1,044	1,096
Gross profit	659	633	2,524	2,222
Operating expenses:
Research and development	329	285	985	870
Marketing and sales	230	240	511	511
General and administrative	120	110	343	329
Amortization of intangibles	1	2	4	5
Total operating expenses	680	637	1,843	1,715
Operating income (loss)	(21)	(4)	681	507
Interest and other income (expense), net	5	(2)	14	(13)
Income (loss) before provision for (benefit from) income taxes	(16)	(6)	695	494
Provision for (benefit from) income taxes	170	(5)	259	93
Net income (loss)	$ (186)	$ (1)	$ 436	$ 401
Earnings (loss) per share:
Basic	$ (0.60)	$ 0.00	$ 1.41	$ 1.33
Diluted	$ (0.60)	$ 0.00	$ 1.40	$ 1.28
Number of shares used in computation:
Basic	308	303	309	302
Diluted	308	303	312	314