Restructuring And Other Charges (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 25, 2014 August Fiscal 2014 Restructuring Plan	Jan. 25, 2014 August Fiscal 2014 Restructuring Plan positions	Jan. 26, 2013 Fiscal 2011 Plans	Jan. 26, 2013 Fiscal 2011 Plans	Jul. 27, 2013 Fiscal 2011 Plans	Jan. 25, 2014 Fiscal 2011 Plans
Restructuring Cost and Reserve [Line Items]
Expected Number of Positions Eliminated (headcounts)		4,000
Restructuring, position eliminated of total positions, percent		5.00%
Restructuring and Related Cost, Cost Incurred to Date	$ 73	$ 310			$ 1,100
Restructuring and Related Cost, Expected Cost		550
Restructuring Reserve	44	44				9
Restructuring Charges		$ 310	$ 13	$ 72