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Stockholders' Equity - Stock Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Stockholders' Equity Note [Abstract]      
Shares (in shares) 64 59 418
Weighted-Average Price per Share (in dollars per share) $ 45.48 $ 44.36 $ 49.22
Amount $ 2,902 $ 2,619 $ 20,577