Segment Information and Major Customers - Summary of Net Revenue for Groups of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2021	Jan. 25, 2020	Jan. 23, 2021	Jan. 25, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 11,960	$ 12,005	$ 23,889	$ 25,164
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	8,572	8,671	17,159	18,549
Infrastructure Platforms
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,391	6,567	12,732	14,120
Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,354	1,349	2,734	2,847
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	822	749	1,684	1,565
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	4	7	9	17
Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3,388	$ 3,334	$ 6,730	$ 6,615