Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares shares in Millions	12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Number Outstanding
Beginning balance (in shares)	73	103	187
Assumed from acquisitions (in shares)	8	18	1
Exercised (in shares)	(14)	(32)	(71)
Canceled/forfeited/expired (in shares)	(55)	(16)	(14)
Ending balance (in shares)	12	73	103
Weighted-Average Exercise Price per Share
Beginning balance (in dollars per share)	$ 26.78	$ 28.68	$ 26.03
Assumed from acquisitions (in dollars per share)	4.47	5.17	2.60
Exercised (in dollars per share)	12.11	19.22	21.15
Canceled/forfeited/expired (in dollars per share)	31.83	30.01	29.68
Ending balance (in dollars per share)	$ 6.15	$ 26.78	$ 28.68