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Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 12,900	$ 11,929
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	9,529	8,587
Secure, Agile Networks
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,967	5,434
Hybrid Work
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,109	1,193
End-to-End Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	895	861
Internet for the Future
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,374	942
Optimized Application Experiences
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	181	153
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3	3
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,371	$ 3,342

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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