Goodwill and Purchased Intangible Assets - Schedule of Purchased Intangible Assets With Finite and Indefinite Lives (Details) - USD ($) $ in Millions	Jan. 23, 2021	Jul. 25, 2020
Purchased intangible assets with finite lives:
Gross	$ 3,411	$ 4,084
Accumulated Amortization	(2,109)	(2,721)
Total purchased intangible assets with finite lives, net	1,302	1,363
In-process research and development, with indefinite lives	160	213
Total finite and indefinite lives intangible assets, gross	3,571	4,297
Total finite and indefinite lives intangible assets, net	1,462	1,576
Technology
Purchased intangible assets with finite lives:
Gross	2,625	3,298
Accumulated Amortization	(1,700)	(2,336)
Total purchased intangible assets with finite lives, net	925	962
Customer relationships
Purchased intangible assets with finite lives:
Gross	773	760
Accumulated Amortization	(404)	(365)
Total purchased intangible assets with finite lives, net	369	395
Other
Purchased intangible assets with finite lives:
Gross	13	26
Accumulated Amortization	(5)	(20)
Total purchased intangible assets with finite lives, net	$ 8	$ 6