Segment Information and Major Customers (Summary of Net Revenue for Groups of Similar Products and Services) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 27, 2018	Oct. 28, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 13,072	$ 12,136
Infrastructure Platforms
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	7,642	6,980
Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	1,419	1,203
Security
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	651	585
Other Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	178	286
Total Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	9,890	9,054
Service
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, total	$ 3,182	$ 3,082