Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 27, 2024	Apr. 29, 2023	Apr. 27, 2024	Apr. 29, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 12,702	$ 14,571	$ 40,161	$ 41,795
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	9,024	11,092	29,395	31,492
Networking
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,522	8,982	22,425	25,105
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,304	958	3,288	2,872
Collaboration
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	987	985	3,093	3,029
Observability
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	211	167	589	486
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,678	$ 3,479	$ 10,766	$ 10,303