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Net Income per Share - Calculation of Basic and Diluted Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Oct. 30, 2021
Oct. 24, 2020
Earnings Per Share [Abstract]    
Net income $ 2,980 $ 2,174
Weighted-average shares—basic (in shares) 4,218 4,230
Effect of dilutive potential common shares (in shares) 25 14
Weighted-average shares—diluted (in shares) 4,243 4,244
Net income per share—basic (in dollars per share) $ 0.71 $ 0.51
Net income per share—diluted (in dollars per share) $ 0.70 $ 0.51
Antidilutive employee share-based awards, excluded (in shares) 12 35