Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Jul. 30, 2016	Jul. 25, 2015
Business Acquisition [Line Items]
Gross	$ 4,916	$ 5,172
Accumulated Amortization	(2,637)	(2,813)
Total	2,279	2,359
In-process research and development, with indefinite lives	222	17
Total- Gross	5,138	5,189
Total- Net	2,501	2,376
TECHNOLOGY
Business Acquisition [Line Items]
Gross	3,038	3,418
Accumulated Amortization	(1,391)	(1,818)
Total	1,647	1,600
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,793	1,699
Accumulated Amortization	(1,203)	(971)
Total	590	728
OTHER
Business Acquisition [Line Items]
Gross	85	55
Accumulated Amortization	(43)	(24)
Total	$ 42	$ 31