Segment Information and Major Customers (Summary Of Net Revenue For Groups Of Similar Products And Services) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 12,136	$ 12,352
Infrastructure Platforms
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	6,970	7,273
Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	1,203	1,136
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	585	540
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	296	353
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	9,054	9,302
Service
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 3,082	$ 3,050