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Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Oct. 27, 2018
Jul. 28, 2018
Jul. 29, 2017
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) 8,000,000 46,000,000  
Assumed from acquisitions (in shares)   1,000,000  
Vested (in shares) (19,000,000) (53,000,000)  
Canceled/forfeited (in shares) (4,000,000) (16,000,000)  
Ending balance (in shares) 104,000,000 119,000,000 141,000,000
Weighted-Average Grant Date Fair Value per Share      
Beginning balance (in dollars per share) $ 30.56 $ 26.94  
Granted (in dollars per share) 45.05 35.62  
Assumed from acquisitions (in dollars per share)   28.26  
Vested (in dollars per share) 25.92 26.02  
Canceled/forfeited (in dollars per share) 30.33 28.37  
Ending balance (in dollars per share) $ 32.48 $ 30.56 $ 26.94
Aggregate Fair Value $ 883   $ 1,909