Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 25, 2014
Goodwill [Roll Forward]
Balance	$ 24,239
Acquisitions	146
Other	(21)
Balance	24,364
Americas
Goodwill [Roll Forward]
Balance	15,080
Acquisitions	75
Other	(11)
Balance	15,144
EMEA
Goodwill [Roll Forward]
Balance	5,715
Acquisitions	60
Other	(6)
Balance	5,769
APJC
Goodwill [Roll Forward]
Balance	3,444
Acquisitions	11
Other	(4)
Balance	$ 3,451