Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) $ in Millions	6 Months Ended
	Jan. 28, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 26,625
Acquisitions	217
Other	(20)
Ending Balance	26,822
Americas
Goodwill [Roll Forward]
Beginning Balance	16,529
Acquisitions	132
Other	(16)
Ending Balance	16,645
EMEA
Goodwill [Roll Forward]
Beginning Balance	6,269
Acquisitions	62
Other	(3)
Ending Balance	6,328
APJC
Goodwill [Roll Forward]
Beginning Balance	3,827
Acquisitions	23
Other	(1)
Ending Balance	$ 3,849