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Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Details) - Restricted Stock/Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Restricted Stock/ Stock Units      
Unvested, Beginning balance (in shares) 141 145 143
Granted (in shares) 46 50 62
Assumed from acquisitions (in shares) 1 15 6
Vested (in shares) (53) (54) (54)
Canceled/forfeited/other (in shares) (16) (15) (12)
Unvested, Ending balance (in shares) 119 141 145
Weighted-Average Grant Date Fair Value per Share      
Unvested, Beginning balance (in dollars per share) $ 26.94 $ 24.26 $ 22.08
Granted (in dollars per share) 35.62 27.89 25.90
Assumed from acquisitions (in dollars per share) 28.26 32.21 24.58
Vested (in dollars per share) 26.02 23.14 20.68
Canceled/forfeited (in dollars per share) 28.37 23.56 22.91
Unvested, Ending balance (in dollars per share) $ 30.56 $ 26.94 $ 24.26
Aggregate Fair Value      
Vested $ 1,909 $ 1,701 $ 1,428