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Shareholders' Equity (Additional Information) (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 13, 2019
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
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 $ 0.66 $ 0.58    
Payments of dividends   $ 1,500,000,000 $ 1,400,000,000 $ 2,970,000,000 $ 2,861,000,000    
Cash dividends declared (in dollars per share)   $ 0.33 $ 0.29 $ 0.66 $ 0.58    
Authorized additional repurchase amount             $ 15,000,000,000
Remaining authorized repurchase amount   $ 24,000,000,000   $ 24,000,000,000      
Stock repurchase program              
Class of Stock [Line Items]              
Stock repurchases pending settlement   $ 160,000,000   $ 160,000,000   $ 180,000,000  
Subsequent event              
Class of Stock [Line Items]              
Cash dividends declared (in dollars per share) $ 0.35