Balance Sheet Details (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021	[1]
Remaining Performance Obligations
Depreciation expense	$ 41	$ 37	$ 120	$ 100
Deferred Revenue, Current	2,101		2,101		$ 1,527
Deferred Revenue, Revenue Recognized			1,607	$ 1,002
Unsatisfied Performance Obligations [Member]
Remaining Performance Obligations
Revenue, Remaining Performance Obligation, Amount	$ 74		$ 74

[1] Derived from audited Consolidated Financial Statements.