Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares shares in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding, options	187	276	520
Assumed from acquisitions	1	6	10
Exercised	(71)	(78)	(154)
Canceled/forfeited/expired	(14)	(17)	(100)
Ending balance, Number Outstanding, options	103	187	276
Weighted-Average Exercise Price per Share, Beginning Balance, dollars per share	$ 26.03	$ 24.44	$ 22.68
Assumed from acquisitions, Weighted-Average Exercise Price per Share, dollars per share	2.60	3.60	0.77
Exercised, Weighted-Average Exercise Price per Share, dollars per share	21.15	18.30	18.51
Canceled/forfeited/expired, Weighted-Average Exercise Price per Share, dollars per share	29.68	27.53	22.18
Weighted-Average Exercise Price per Share, Ending Balance, dollars per share	$ 28.68	$ 26.03	$ 24.44