Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares shares in Millions	3 Months Ended	12 Months Ended
	Oct. 24, 2015	Jul. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding, options	103	187
Assumed from acquisitions	3	1
Exercised	(17)	(71)
Canceled/forfeited/expired	(5)	(14)
Ending balance, Number Outstanding, options	84	103
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share	$ 28.68	$ 26.03
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share	2.13	2.60
Exercised, Weighted-Average Exercise Price per Share, dollars per share	22.10	21.15
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share	30.15	29.68
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share	$ 29.09	$ 28.68