Balance Sheet Details (Property And Equipment, Net Schedule) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,263	$ 1,219
Less: accumulated depreciation	(702)	(651)
Property and equipment, net	561	568	[1]
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	637	575
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	341	339
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	129	121
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	73	72
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	64	64
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10	10
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9	$ 38

[1] Derived from audited consolidated financial statements.