Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenue	$ 1,348	$ 1,286	$ 2,557	$ 2,423
Cost of revenue	405	418	592	633
Gross profit	943	868	1,965	1,790
Operating expenses:
Research and development	387	339	768	701
Marketing and sales	152	146	262	286
General and administrative	128	117	238	231
Acquisition-related contingent consideration	2	2	3	2
Amortization of intangibles	6	6	11	12
Total operating expenses	675	610	1,282	1,232
Operating income (loss)	268	258	683	558
Interest and other income (expense), net	16	18	37	37
Income before provision for income taxes	284	276	720	595
Provision for income taxes	(570)	21	(1,555)	47
Net income (loss)	$ 854	$ 255	$ 2,275	$ 548
Earnings (loss) per share:
Earnings Per Share, Basic	$ 2.89	$ 0.84	$ 7.69	$ 1.80
Earnings Per Share, Diluted	$ 2.89	$ 0.83	$ 7.66	$ 1.77
Number of shares used in computation:
Basic	295	305	296	305
Diluted	296	307	297	309
Product [Member]
Net revenue	$ 568	$ 623	$ 734	$ 825
Cost of revenue	193	222	228	290
Service [Member]
Net revenue	780	663	1,823	1,598
Cost of revenue	$ 212	$ 196	$ 364	$ 343