Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) $ in Millions	3 Months Ended
	Oct. 28, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 29,766
Acquisitions	443
Other	24
Ending Balance	30,233
Americas
Goodwill [Roll Forward]
Beginning Balance	18,691
Acquisitions	323
Other	15
Ending Balance	19,029
EMEA
Goodwill [Roll Forward]
Beginning Balance	7,057
Acquisitions	92
Other	6
Ending Balance	7,155
APJC
Goodwill [Roll Forward]
Beginning Balance	4,018
Acquisitions	28
Other	3
Ending Balance	$ 4,049