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Goodwill and Purchased Intangible Assets - Schedule of Purchased Intangible Assets with Finite and Indefinite Lives (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
Purchased intangible assets with finite lives:
Gross	$ 5,087	$ 4,084
Accumulated Amortization	(1,973)	(2,721)
Total purchased intangible assets with finite lives, net	3,114	1,363
In-process research and development, with indefinite lives	505	213
Total finite and indefinite lives intangible assets, gross	5,592	4,297
Total finite and indefinite lives intangible assets, net	3,619	1,576
Technology
Purchased intangible assets with finite lives:
Gross	3,629	3,298
Accumulated Amortization	(1,437)	(2,336)
Total purchased intangible assets with finite lives, net	2,192	962
Customer relationships
Purchased intangible assets with finite lives:
Gross	1,387	760
Accumulated Amortization	(523)	(365)
Total purchased intangible assets with finite lives, net	864	395
Other
Purchased intangible assets with finite lives:
Gross	71	26
Accumulated Amortization	(13)	(20)
Total purchased intangible assets with finite lives, net	$ 58	$ 6

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