Balance Sheet Details (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	[1]
Remaining Performance Obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Depreciation expense	$ 40	$ 31
Deferred Revenue, Current	1,305		$ 1,527
Deferred Revenue, Revenue Recognized	$ 961	$ 742

[1] Derived from audited Consolidated Financial Statements.