Balance Sheet Details (Accrued And Other Current Liabilities Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Other accrued expenses	$ 346	$ 210
Accrued compensation and benefits	249	267
Accrued royalties	260	165
Deferred net revenue (other)	215	147
Accrued and other current liabilities	$ 1,070	$ 789	[1]

[1] Derived from audited Consolidated Financial Statements.