Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) (USD $) In Millions, unless otherwise specified	Oct. 25, 2014	Jul. 26, 2014
Business Acquisition [Line Items]
Gross	$ 5,914	$ 5,857
Accumulated Amortization	(2,970)	(2,709)
Total	2,944	3,148
In-process research and development, with indefinite lives	122	132
Total- Gross	6,036	5,989
Total	3,066	3,280
TECHNOLOGY
Business Acquisition [Line Items]
Gross	4,150	4,100
Accumulated Amortization	(2,166)	(1,976)
Total	1,984	2,124
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,713	1,706
Accumulated Amortization	(788)	(720)
Total	925	986
OTHER
Business Acquisition [Line Items]
Gross	51	51
Accumulated Amortization	(16)	(13)
Total	$ 35	$ 38