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Shareholders' Equity (Additional Information) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Jul. 28, 2018
Feb. 14, 2018
Class of Stock [Line Items]        
Cash dividends paid per common share (in dollars per share) $ 0.33 $ 0.29    
Payments of dividends $ 1,500,000,000 $ 1,436,000,000    
Authorized additional repurchase amount       $ 25,000,000,000
Remaining authorized repurchase amount $ 14,000,000,000      
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares) 7 11    
Payments related to tax withholding for share-based compensation $ 318,000,000 $ 342,000,000    
Stock repurchase program        
Class of Stock [Line Items]        
Stock repurchases pending settlement $ 130,000,000   $ 180,000,000