Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares shares in Millions	12 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 30, 2016
Number Outstanding
Beginning balance (in shares)	12	73	103
Assumed from acquisitions (in shares)	3	8	18
Exercised (in shares)	(8)	(14)	(32)
Canceled/forfeited/expired (in shares)	(1)	(55)	(16)
Ending balance (in shares)	6	12	73
Weighted-Average Exercise Price per Share
Beginning balance (in dollars per share)	$ 6.15	$ 26.78	$ 28.68
Assumed from acquisitions (in dollars per share)	8.20	4.47	5.17
Exercised (in dollars per share)	5.77	12.11	19.22
Canceled/forfeited/expired (in dollars per share)	8.75	31.83	30.01
Ending balance (in dollars per share)	$ 7.18	$ 6.15	$ 26.78