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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 12,900	$ 11,929
Product
Disaggregation of Revenue [Line Items]
Revenue	9,529	8,587
Secure, Agile Networks
Disaggregation of Revenue [Line Items]
Revenue	5,967	5,434
Hybrid Work
Disaggregation of Revenue [Line Items]
Revenue	1,109	1,193
End-to-End Security
Disaggregation of Revenue [Line Items]
Revenue	895	861
Internet for the Future
Disaggregation of Revenue [Line Items]
Revenue	1,374	942
Optimized Application Experiences
Disaggregation of Revenue [Line Items]
Revenue	181	153
Other Products
Disaggregation of Revenue [Line Items]
Revenue	3	3
Services
Disaggregation of Revenue [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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