Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2023	Oct. 29, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 14,668	$ 13,632
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	11,139	10,245
Networking
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	8,822	8,031
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,010	971
Collaboration
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,117	1,086
Observability
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	190	157
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,529	$ 3,387