Balance Sheet Details (Property And Equipment, Net Schedule) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 1,336	$ 1,319
Less: accumulated depreciation	(853)	(809)
Property and equipment, net	483	510
Computer, equipment and software
Property and Equipment, Net [Line Items]
Property and equipment, gross	733	718
Buildings
Property and Equipment, Net [Line Items]
Property and equipment, gross	329	327
Leasehold improvements
Property and Equipment, Net [Line Items]
Property and equipment, gross	131	129
Office equipment, furniture and fixtures
Property and Equipment, Net [Line Items]
Property and equipment, gross	66	67
Land
Property and Equipment, Net [Line Items]
Property and equipment, gross	63	63
Warehouse, equipment and other
Property and Equipment, Net [Line Items]
Property and equipment, gross	9	10
Construction in progress
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 5	$ 5