Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 25, 2014 Fiscal Year 2013 Initiative [Member]	Jul. 26, 2013 Fiscal Year 2013 Initiative [Member]	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member]	Jul. 25, 2014 Fiscal Year 2013 Initiative [Member] Employee Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Employee Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Asset Write-downs	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Inventory write-offs	Jul. 25, 2014 Fiscal Year 2013 Initiative [Member] Other Costs	Jul. 26, 2013 Fiscal Year 2013 Initiative [Member] Contract Termination Costs	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Contract Termination Costs	Jul. 25, 2014 Fiscal Year 2013 Initiative [Member] Other Restructuring [Member]	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Other Restructuring [Member]	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member]	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member]	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member] Employee Termination Costs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Employee Termination Costs	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member] Asset Write-downs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Asset Write-downs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Inventory write-offs	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member] Other Costs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Contract Termination Costs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Other Restructuring [Member]
Changes in Restructuring Reserves
Beginning balance	$ 24			$ 23				$ 1					$ 75		$ 64		$ 0			$ 11
Restructuring Charges		18	192		150	13	10		14	18	4	11	38	116	1	65	9	26	10	28	3	22
Payments/write-downs	(6)			(5)				(1)					(45)		(17)		(9)			(19)
Restructuring Reserve, Accrual Adjustment	(2)			(2)				0					(6)		(6)		0			0
Ending balance	$ 16			$ 16				$ 0					$ 62	$ 75	$ 42	$ 64	$ 0	$ 0		$ 20