Balance Sheet Details (Property And Equipment, Net Schedule) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 162	$ 138	$ 120
Property and equipment, gross	1,621	1,521
Less accumulated depreciation	(1,071)	(1,030)
Property and equipment, net	550	491
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	853	808
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	375	370
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	202	172
Equipment, furniture and fixtures, and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	95	93
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	66	66
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 30	$ 12