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. 28, 2018	Apr. 29, 2017	Apr. 28, 2018	Apr. 29, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 12,463	$ 11,940	$ 36,486	$ 35,872
Infrastructure Platforms
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	7,163	6,992	20,827	20,810
Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	1,309	1,100	3,696	3,352
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	583	527	1,726	1,595
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	249	266	818	921
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	9,304	8,885	27,067	26,678
Service
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 3,159	$ 3,055	$ 9,419	$ 9,194