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Employee Benefit Plans - Summary of Restricted Stock and Stock Unit Awards (Details) - Restricted Stock/Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 25, 2020
Jul. 27, 2019
Jul. 28, 2018
Restricted Stock/ Stock Units      
Unvested, Beginning balance (in shares) 100 119 141
Granted (in shares) 49 45 46
Assumed from acquisitions (in shares)     1
Vested (in shares) (44) (50) (53)
Canceled/forfeited/other (in shares) (9) (14) (16)
Unvested, Ending balance (in shares) 96 100 119
Weighted-Average Grant Date Fair Value per Share      
Unvested, Beginning balance (in dollars per share) $ 38.66 $ 30.56 $ 26.94
Granted (in dollars per share) 42.61 47.71 35.62
Assumed from acquisitions (in dollars per share)     28.26
Vested (in dollars per share) 35.20 29.25 26.02
Canceled/forfeited (in dollars per share) 40.45 32.01 28.37
Unvested, Ending balance (in dollars per share) $ 42.03 $ 38.66 $ 30.56
Aggregate Fair Value      
Vested $ 2,045 $ 2,446 $ 1,909