Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Oct. 25, 2013	Oct. 26, 2012	Oct. 25, 2013	Oct. 26, 2012	Oct. 25, 2013 Fiscal Year 2013 Initiative	Jul. 26, 2013 Fiscal Year 2013 Initiative	Apr. 26, 2013 Fiscal Year 2013 Initiative	Oct. 25, 2013 Fiscal Year 2013 Initiative Employee Termination Costs	Jul. 26, 2013 Fiscal Year 2013 Initiative Employee Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative Employee Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative Asset Write-downs	Apr. 26, 2013 Fiscal Year 2013 Initiative Inventory write-offs	Oct. 25, 2013 Fiscal Year 2013 Initiative Other Costs	Jul. 26, 2013 Fiscal Year 2013 Initiative Other Costs	Jul. 26, 2013 Fiscal Year 2013 Initiative Contract Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative Contract Termination Costs	Jul. 26, 2013 Fiscal Year 2013 Initiative Other Related Cost	Apr. 26, 2013 Fiscal Year 2013 Initiative Other Related Cost
Changes in Restructuring Reserves
Beginning balance					$ 130	$ 170		$ 106	$ 147				$ 24	$ 23
Restructuring charges	0	0	18	0		18	192		0	150	13	10		18	14	18	4	11
Payments/write-downs					(38)	(58)		(22)	(41)				(16)	(17)
Ending balance					$ 92	$ 130	$ 170	$ 84	$ 106	$ 147			$ 8	$ 24