Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 26, 2024	Oct. 28, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 13,841	$ 14,668
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	10,114	11,139
Networking
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,753	8,822
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	2,017	1,010
Collaboration
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,085	1,117
Observability
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	258	190
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,727	$ 3,529