Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 24, 2014 Fiscal Year 2013 Initiative [Member]	Jul. 25, 2014 Fiscal Year 2013 Initiative [Member]	Jul. 26, 2013 Fiscal Year 2013 Initiative [Member]	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member]	Oct. 24, 2014 Fiscal Year 2013 Initiative [Member] Employee Termination Costs	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	Oct. 24, 2014 Fiscal Year 2013 Initiative [Member] Other Costs	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. 26, 2013 Fiscal Year 2013 Initiative [Member] Other Restructuring [Member]	Apr. 26, 2013 Fiscal Year 2013 Initiative [Member] Other Restructuring [Member]	Oct. 24, 2014 Fiscal Year 2014 Initiative [Member]	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member]	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member]	Oct. 24, 2014 Fiscal Year 2014 Initiative [Member] Employee Termination Costs	Jul. 25, 2014 Fiscal Year 2014 Initiative [Member] Employee Termination Costs	Apr. 25, 2014 Fiscal Year 2014 Initiative [Member] Employee Termination Costs	Oct. 24, 2014 Fiscal Year 2014 Initiative [Member] Asset Write-downs	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	Oct. 24, 2014 Fiscal Year 2014 Initiative [Member] Other Costs	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	$ 16	$ 24			$ 16	$ 23				$ 0	$ 1					$ 62	$ 75		$ 42	$ 64		$ 0	$ 0			$ 20	$ 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	(3)	(6)			(3)	(5)				0	(1)					(22)	(45)		(15)	(17)		0	(9)			(7)	(19)
Restructuring Reserve, Accrual Adjustment		(2)				(2)					0						(6)			(6)			0				0
Ending balance	$ 13	$ 16			$ 13	$ 16				$ 0	$ 0					$ 40	$ 62	$ 75	$ 27	$ 42	$ 64	$ 0	$ 0	$ 0		$ 13	$ 20