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Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jan. 26, 2019
Jul. 28, 2018
Restricted Stock/ Stock Units    
Assumed from acquisitions (in shares)   3,000,000
Weighted-Average Grant Date Fair Value per Share    
Assumed from acquisitions (in dollars per share)   $ 8.20
Restricted Stock/Stock Units    
Restricted Stock/ Stock Units    
Beginning balance (in shares) 119,000,000 141,000,000
Granted (in shares) 25,000,000 46,000,000
Assumed from acquisitions (in shares)   1,000,000
Vested (in shares) (31,000,000) (53,000,000)
Canceled/forfeited (in shares) (10,000,000) (16,000,000)
Ending balance (in shares) 103,000,000 119,000,000
Weighted-Average Grant Date Fair Value per Share    
Beginning balance (in dollars per share) $ 30.56 $ 26.94
Granted (in dollars per share) 44.69 35.62
Assumed from acquisitions (in dollars per share)   28.26
Vested (in dollars per share) 27.99 26.02
Canceled/forfeited (in dollars per share) 31.20 28.37
Ending balance (in dollars per share) $ 34.66 $ 30.56
Aggregate Fair Value $ 1,453 $ 1,909