Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding, options	276	520	621
Assumed from acquisitions	6	10	1
Exercised	(78)	(154)	(66)
Canceled/forfeited/expired	(17)	(100)	(36)
Ending balance, Number Outstanding, options	187	276	520
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share	$ 24.44	$ 22.68	$ 21.79
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share	$ 3.60	$ 0.77	$ 2.08
Exercised, Weighted-Average Exercise Price per Share, dollars per share	$ 18.30	$ 18.51	$ 13.51
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share	$ 27.53	$ 22.18	$ 23.40
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share	$ 26.03	$ 24.44	$ 22.68