Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net revenue:
Net revenue	$ 1,137	$ 1,449
Cost of revenue:
Total cost of revenue	215	154
Gross profit	922	1,295
Operating expenses:
Research and development	362	325
Marketing and sales	140	121
General and administrative	114	105
Amortization of intangibles	6	1
Total operating expenses	622	552
Operating income (loss)	300	743
Interest and other income (expense), net	19	6
Income before provision for income taxes	319	749
Provision for income taxes	26	105
Net income (loss)	$ 293	$ 644
Earnings (loss) per share:
Earnings Per Share, Basic	$ 0.96	$ 2.08
Earnings Per Share, Diluted	$ 0.95	$ 2.06
Number of shares used in computation:
Basic	306	309
Diluted	310	313
Product [Member]
Net revenue:
Net revenue	$ 202	$ 828
Cost of revenue:
Total cost of revenue	68	64
Service [Member]
Net revenue:
Net revenue	935	621
Cost of revenue:
Total cost of revenue	$ 147	$ 90