Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 29, 2022	Oct. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 13,632	$ 12,900
Product
Disaggregation of Revenue [Line Items]
Revenue	10,245	9,529
Secure, Agile Networks
Disaggregation of Revenue [Line Items]
Revenue	6,684	5,968
Internet for the Future
Disaggregation of Revenue [Line Items]
Revenue	1,310	1,373
Collaboration
Disaggregation of Revenue [Line Items]
Revenue	1,086	1,109
End-to-End Security
Disaggregation of Revenue [Line Items]
Revenue	971	895
Optimized Application Experiences
Disaggregation of Revenue [Line Items]
Revenue	193	181
Other Products
Disaggregation of Revenue [Line Items]
Revenue	2	3
Services
Disaggregation of Revenue [Line Items]
Revenue	$ 3,387	$ 3,371