Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019		Mar. 31, 2018	Mar. 31, 2017
Net revenue
Net revenue	$ 4,950	[1]	$ 5,150	$ 4,845
Cost of revenue
Total cost of revenue	1,322		1,277	1,298
Gross profit	3,628		3,873	3,547
Operating expenses:
Research and development	1,433		1,320	1,205
Marketing and sales	702		641	673
General and administrative	460		469	439
Acquisition-related contingent consideration	14		0	0
Amortization of intangibles	23		9	6
Total operating expenses	2,632		2,439	2,323
Operating income	996		1,434	1,224
Interest and other income (expense), net	83		15	(14)
Income before provision for (benefit from) income taxes	1,079		1,449	1,210
Provision for (benefit from) income taxes	60		406	243
Net income	$ 1,019		$ 1,043	$ 967
Earnings per share:
Basic	$ 3.36		$ 3.39	$ 3.19
Diluted	$ 3.33		$ 3.34	$ 3.08
Number of shares used in computation:
Basic	303		308	303
Diluted	306		312	314
Product [Member]
Net revenue
Net revenue	$ 1,593		$ 2,586	$ 2,640
Cost of revenue
Total cost of revenue	517		822	893
Service and other [Member]
Net revenue
Net revenue	3,357		2,564	2,205
Cost of revenue
Total cost of revenue	$ 805		$ 455	$ 405

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