Supplemental Financial Information (Schedule Of Property And Equipment, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Mar. 30, 2012
Property, Plant and Equipment [Line Items]
Depreciable property and equipment	$ 2,704		$ 2,704		$ 2,589
Less: Accumulated depreciation	(1,765)		(1,765)		(1,663)
Depreciable propety and equipment, net	939		939		926
Construction in progress	96		96		95
Land	79		79		79
Property and equipment, net	1,114		1,114		1,100	[1]
Depreciation expense	70	67	141	134
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable property and equipment	1,733		1,733		1,640
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable property and equipment	173		173		176
Buildings [Member]
Property, Plant and Equipment [Line Items]
Depreciable property and equipment	491		491		489
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable property and equipment	$ 307		$ 307		$ 284

[1] Derived from audited financial statements