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Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 49,818	$ 49,301	$ 51,904
Disposed of by sale | SPVSS Business
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue			168
Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	36,014	35,978	39,005
Infrastructure Platforms
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	27,109	27,219	30,184
Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	5,504	5,568	5,803
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	3,382	3,158	2,822
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	19	33	196
Service
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 13,804	$ 13,323	$ 12,899

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