Supplemental Information Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Nov. 13, 2013	Oct. 26, 2013	Jul. 27, 2013
Supplementary Information[Line Items]
Aggregate Authorized Common Stock Repurchase		$ 82,000,000,000
Stock Repurchase Program, Authorized Amount	15,000,000,000	82,000,000,000
Repurchases of common stock under the repurchase program, shares		3,952	3,868
Repurchases of common stock under the repurchase program, value		80,906,000,000	78,906,000,000
Common Stock [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, shares		3,952
Common Stock Including Additional Paid in Capital [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value		18,664,000,000
Retained Earnings [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value		62,242,000,000
Parent [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value		$ 80,906,000,000