Restructuring Charges (Details) (Fiscal Year 2013 Initiative, USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 24, 2014	Oct. 25, 2013	Jul. 26, 2013	Apr. 26, 2013
Changes in Restructuring Reserves
Beginning balance	$ 92	$ 130	$ 170
Restructuring (credits) charges, net			18	192
Payments/write-downs	(11)	(38)	(58)
Restructuring Reserve, Accrual Adjustment	(15)
Ending balance	66	92	130	170
Employee Termination Costs
Changes in Restructuring Reserves
Beginning balance	84	106	147
Restructuring (credits) charges, net			0	150
Payments/write-downs	(7)	(22)	(41)
Restructuring Reserve, Accrual Adjustment	(14)
Ending balance	63	84	106	147
Asset Write-downs
Changes in Restructuring Reserves
Restructuring (credits) charges, net				13
Inventory write-offs
Changes in Restructuring Reserves
Restructuring (credits) charges, net				10
Other Costs
Changes in Restructuring Reserves
Beginning balance	8	24	23
Restructuring (credits) charges, net			18
Payments/write-downs	(4)	(16)	(17)
Restructuring Reserve, Accrual Adjustment	(1)
Ending balance	3	8	24
Contract Termination Costs
Changes in Restructuring Reserves
Restructuring (credits) charges, net			14	18
Other Restructuring [Member]
Changes in Restructuring Reserves
Restructuring (credits) charges, net			$ 4	$ 11