Restructuring Charges (Details) (Fiscal Year 2012 Initiative, USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	12 Months Ended
	Oct. 26, 2012	Jul. 27, 2012	Apr. 27, 2012 Positions	Oct. 26, 2012 Positions	Apr. 27, 2012
Changes in Restructuring Reserves
Beginning balance	$ 48	$ 91		$ 91	$ 0
Restructuring charges					118
Payments/write-downs	(21)	(43)			(27)
Ending balance	27	48	91	27	91
Restructuring charge			118
Expected number of positions eliminated			1,000
Number of positions eliminated				600
Employee Termination Costs
Changes in Restructuring Reserves
Beginning balance	38	64		64	0
Restructuring charges					66
Payments/write-downs	(17)	(26)			(2)
Ending balance	21	38	64	21	64
Restructuring charge			66
Asset Write-downs
Changes in Restructuring Reserves
Beginning balance	0	0		0	0
Restructuring charges					9
Payments/write-downs	0	0			(9)
Ending balance	0	0	0	0	0
Restructuring charge			9
Contract Termination Costs
Changes in Restructuring Reserves
Restructuring charge			30
Other Related Cost
Changes in Restructuring Reserves
Beginning balance	10	27		27	0
Restructuring charges					43
Payments/write-downs	(4)	(17)			(16)
Ending balance	6	10	27	6	27
Restructuring charge			$ 13