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Shareholders' Equity (Additional Information) (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 27, 2019
Apr. 28, 2018
Jul. 28, 2018
Feb. 14, 2018
Class of Stock [Line Items]            
Cash dividends paid per common share (in dollars per share) $ 0.35 $ 0.33 $ 1.01 $ 0.91    
Payments of dividends $ 1,500,000,000 $ 1,600,000,000 $ 4,489,000,000 $ 4,433,000,000    
Authorized additional repurchase amount           $ 15,000,000,000
Remaining authorized repurchase amount 18,000,000,000   18,000,000,000      
Stock repurchase program            
Class of Stock [Line Items]            
Stock repurchases pending settlement $ 200,000,000   $ 200,000,000   $ 180,000,000