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Shareholders' Equity - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 27, 2019
Apr. 27, 2019
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Apr. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 27, 2019
Jul. 28, 2018
Jul. 29, 2017
Feb. 13, 2019
Stockholders' Equity Note [Abstract]                        
Cash dividends paid per common share (in dollars per share) $ 0.35 $ 0.35 $ 0.33 $ 0.33 $ 0.33 $ 0.33 $ 0.29 $ 0.29 $ 1.36 $ 1.24 $ 1.1  
Payments of dividends                 $ 5,979,000,000 $ 5,968,000,000 $ 5,511,000,000  
Authorized additional repurchase amount                       $ 15,000,000,000
Remaining authorized repurchase amount $ 13,500,000,000               13,500,000,000      
Stock repurchase program                        
Class of Stock [Line Items]                        
Stock repurchases pending settlement $ 40,000,000       $ 180,000,000       $ 40,000,000 $ 180,000,000 $ 66,000,000