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Shareholders' Equity (Additional Information) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jul. 28, 2018
Apr. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Feb. 14, 2018
Stockholders' Equity Note [Abstract]                        
Cash dividends paid per common share (in dollars per share) $ 0.33 $ 0.33 $ 0.29 $ 0.29 $ 0.29 $ 0.29 $ 0.26 $ 0.26 $ 1.24 $ 1.1 $ 0.94  
Payments of dividends                 $ 5,968 $ 5,511 $ 4,750  
Authorized additional repurchase amount                       $ 25,000
Remaining authorized repurchase amount $ 19,000               $ 19,000      
Class of Stock [Line Items]                        
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)                 20 20 21  
Payments related to tax withholding for share-based compensation                 $ 703 $ 619 $ 557  
Stock repurchase program                        
Class of Stock [Line Items]                        
Stock repurchases pending settlement $ 180       $ 66       $ 180 $ 66 $ 45