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Shareholders' Equity - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 26, 2014
Apr. 27, 2013
Apr. 26, 2014
Stock Repurchase Program
Jul. 27, 2013
Stock Repurchase Program
Shareholders Equity [Line Items]            
Cash dividends declared per common share (in dollars per share) $ 0.19 $ 0.17 $ 0.53 $ 0.45    
Payments of Dividends     $ 2,784,000,000 $ 2,392,000,000    
Stock Repurchase Program, Authorized Amount 97,000,000,000   97,000,000,000      
Stock Repurchase Program, Remaining Authorized Repurchase Amount     10,100,000,000      
Accrued Liabilities, Current         60,000,000 0
Shares Withheld for Employee Tax Withholding Upon Vesting of RSU (in shares)     14 13    
Payments Related to Tax Withholding for Share-based Compensation     $ 345,000,000 $ 249,000,000