Supplemental Information Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013
Supplementary Information[Line Items]
Stock Repurchase Program, Authorized Amount	$ 97,000,000,000
Repurchases of common stock under the repurchase program, shares	4,227	3,868
Repurchases of common stock under the repurchase program, value	86,931,000,000	78,906,000,000
Common Stock Including Additional Paid in Capital [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	20,839,000,000
Retained Earnings [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	66,092,000,000
Parent [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	$ 86,931,000,000