Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net revenue	$ 5,629	$ 5,537	$ 4,950
Cost of Revenue	1,494	1,369	1,322
Gross profit	4,135	4,168	3,628
Operating Expenses [Abstract]
Research and development	1,778	1,559	1,433
Marketing and sales	689	631	702
General and administrative	592	506	460
Acquisition-related contingent consideration	0	5	14
Amortization of intangibles	30	22	23
Total operating expenses	3,089	2,723	2,632
Operating income	1,046	1,445	996
Interest and other income (expense), net	(29)	63	83
Income before provision for (benefit from) income taxes	1,017	1,508	1,079
Provision for (benefit from) income taxes	180	(1,531)	60
Net income	$ 837	$ 3,039	$ 1,019
Earnings Per Share [Abstract]
Basic	$ 2.90	$ 10.37	$ 3.36
Diluted	$ 2.87	$ 10.30	$ 3.33
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic	289	293	303
Diluted	292	295	306