Goodwill and Purchased Intangible Assets (Schedule of Goodwill by Reportable Segments) (Details) $ in Millions	9 Months Ended
	Apr. 28, 2018 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 29,766
Acquisitions	1,856
Other	32
Ending Balance	31,654
Americas
Goodwill [Roll Forward]
Beginning Balance	18,691
Acquisitions	1,194
Other	17
Ending Balance	19,902
EMEA
Goodwill [Roll Forward]
Beginning Balance	7,057
Acquisitions	491
Other	9
Ending Balance	7,557
APJC
Goodwill [Roll Forward]
Beginning Balance	4,018
Acquisitions	171
Other	6
Ending Balance	$ 4,195