Goodwill and Purchased Intangible Assets - Schedule of Goodwill by Reportable Segments (Details) $ in Millions	6 Months Ended
	Jan. 25, 2020 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 33,529
Acquisitions	83
Other	0
Ending Balance	33,612
Americas
Goodwill [Roll Forward]
Beginning Balance	21,120
Acquisitions	62
Other	1
Ending Balance	21,183
EMEA
Goodwill [Roll Forward]
Beginning Balance	7,977
Acquisitions	17
Other	0
Ending Balance	7,994
APJC
Goodwill [Roll Forward]
Beginning Balance	4,432
Acquisitions	4
Other	(1)
Ending Balance	$ 4,435