Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 25, 2014	Jul. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding, options	187	276
Assumed from acquisitions	1	6
Exercised	(19)	(78)
Canceled/forfeited/expired	(6)	(17)
Ending balance, Number Outstanding, options	163	187
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share	$ 26.03	$ 24.44
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share	$ 2.72	$ 3.60
Exercised, Weighted-Average Exercise Price per Share, dollars per share	$ 18.66	$ 18.30
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share	$ 29.05	$ 27.53
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share	$ 26.63	$ 26.03