Employee Benefit Plans (Summary Of Stock Option Activity) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding, options	520	621	732
Assumed from acquisitions	10	1
Exercised	(154)	(66)	(80)
Canceled/forfeited/expired	(100)	(36)	(31)
Ending balance, Number Outstanding, options	276	520	621
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share	$ 22.68	$ 21.79	$ 21.39
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share	$ 0.77	$ 2.08
Exercised, Weighted-Average Exercise Price per Share, dollars per share	$ 18.51	$ 13.51	$ 16.55
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share	$ 22.18	$ 23.40	$ 25.91
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share	$ 24.44	$ 22.68	$ 21.79