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Shareholders' Equity (Additional Information) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 29, 2017
Apr. 30, 2016
Class of Stock [Line Items]        
Cash dividends paid per common share (in dollars per share) $ 0.29 $ 0.26 $ 0.81 $ 0.68
Payments of dividends     $ 4,063,000,000 $ 3,441,000,000
Authorized common stock repurchase amount $ 112,000,000,000   112,000,000,000  
Remaining authorized repurchase amount $ 12,900,000,000   $ 12,900,000,000  
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)     16 18
Payments related to tax withholding for share-based compensation     $ 497,000,000 $ 469,000,000