Segment Information (Schedule Of Reportable Segment Data) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 28, 2012		Sep. 30, 2011		Sep. 28, 2012 segment		Sep. 30, 2011
Segment Reporting Information [Line Items]
Net revenue	$ 1,699		$ 1,681		$ 3,367		$ 3,334
Percentage of total net revenue	100.00%		100.00%		100.00%		100.00%
Operating income (loss)	305		285		574		587
Number of Reportable Segments					5
Consumer [Member]
Segment Reporting Information [Line Items]
Net revenue	528		531		1,049		1,056
Percentage of total net revenue	31.00%		31.00%		31.00%		32.00%
Operating income (loss)	264		257		521		512
Operating margin	50.00%		48.00%		50.00%		48.00%
Security And Compliance [Member]
Segment Reporting Information [Line Items]
Net revenue	512		482		1,013		949
Percentage of total net revenue	30.00%		29.00%		30.00%		28.00%
Operating income (loss)	152		102		289		192
Operating margin	30.00%		21.00%		29.00%		20.00%
Storage And Server Management [Member]
Segment Reporting Information [Line Items]
Net revenue	595		605		1,179		1,203
Percentage of total net revenue	35.00%		36.00%		35.00%		36.00%
Operating income (loss)	236		256		471		534
Operating margin	40.00%		42.00%		40.00%		44.00%
Services [Member]
Segment Reporting Information [Line Items]
Net revenue	64		63		126		126
Percentage of total net revenue	4.00%		4.00%		4.00%		4.00%
Operating income (loss)	12		10		21		18
Operating margin	19.00%		16.00%		17.00%		14.00%
Other [Member]
Segment Reporting Information [Line Items]
Net revenue
Percentage of total net revenue	0.00%		0.00%		0.00%		0.00%
Operating income (loss)	$ (359)		$ (340)		$ (728)		$ (669)
Operating margin		[1]		[1]		[1]		[1]

[1] Percentage not meaningful