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Employee Benefit Plans - Summary of Restricted Stock and Stock Unit Activity (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jan. 29, 2022
Jul. 31, 2021
Restricted Stock/ Stock Units    
Beginning balance (in shares) 94 96
Granted and assumed (in shares) 33 51
Vested (in shares) (21) (39)
Canceled/forfeited/other (in shares) (7) (14)
Ending balance (in shares) 99 94
Weighted-Average Grant Date Fair Value per Share    
Beginning balance (in dollars per share) $ 42.93 $ 42.03
Granted and assumed (in dollars per share) 53.99 41.89
Vested (in dollars per share) 41.11 39.63
Canceled/forfeited/other (in dollars per share) 44.62 42.13
Ending balance (in dollars per share) $ 46.83 $ 42.93
Aggregate Fair  Value    
Vested $ 1,183 $ 1,813