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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. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Restricted Stock/ Stock Units      
Unvested, Beginning balance (in shares) 145 143 149
Granted (in shares) 50 62 66
Assumed from acquisitions (in shares) 15 6 1
Vested (in shares) (54) (54) (57)
Canceled/forfeited/other (in shares) (15) (12) (16)
Unvested, Ending balance (in shares) 141 145 143
Weighted-Average Grant Date Fair Value per Share      
Unvested, Beginning balance (in dollars per share) $ 24.26 $ 22.08 $ 19.54
Granted (in dollars per share) 27.89 25.90 25.23
Assumed from acquisitions (in dollars per share) 32.21 24.58 24.85
Vested (in dollars per share) 23.14 20.68 19.82
Canceled/forfeited (in dollars per share) 23.56 22.91 19.67
Unvested, Ending balance (in dollars per share) $ 26.94 $ 24.26 $ 22.08
Aggregate Fair Value      
Vested $ 1,701 $ 1,428 $ 1,517