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. 29, 2023	Apr. 30, 2022	Apr. 29, 2023	Apr. 30, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 14,571	$ 12,835	$ 41,795	$ 38,455
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	11,092	9,448	31,492	28,330
Secure, Agile Networks
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	7,550	5,870	20,980	17,737
Internet for the Future
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,392	1,324	4,007	4,019
Collaboration
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	985	1,132	3,029	3,308
End-to-End Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	958	938	2,872	2,716
Optimized Application Experiences
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	204	183	597	544
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3	2	7	7
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,479	$ 3,387	$ 10,303	$ 10,125