Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) $ in Millions	3 Months Ended
	Oct. 24, 2015 USD ($)
Goodwill [Roll Forward]
Balance (Beg)	$ 24,469
Acquisitions	557
Other	(144)
Balance (End)	24,882
Americas
Goodwill [Roll Forward]
Balance (Beg)	15,212
Acquisitions	361
Other	(90)
Balance (End)	15,483
EMEA
Goodwill [Roll Forward]
Balance (Beg)	5,791
Acquisitions	141
Other	(34)
Balance (End)	5,898
APJC
Goodwill [Roll Forward]
Balance (Beg)	3,466
Acquisitions	55
Other	(20)
Balance (End)	$ 3,501