Goodwill and Purchased Intangible Assets (Schedule Of Intangible Assets Acquired Through Business Combinations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 25, 2014
Intangible Assets Acquired Through Business Combinations
Amount	$ 58
IPR&D
Intangible Assets Acquired Through Business Combinations
Amount	6
TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Amount	45
CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Amount	7
Metacloud, Inc.
Intangible Assets Acquired Through Business Combinations
Amount	29
Metacloud, Inc. | IPR&D
Intangible Assets Acquired Through Business Combinations
Amount	2
Metacloud, Inc. | TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	3 years
Amount	24
Metacloud, Inc. | CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Amount	3
Other
Intangible Assets Acquired Through Business Combinations
Amount	29
Other | IPR&D
Intangible Assets Acquired Through Business Combinations
Amount	4
Other | TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Amount	21
Other | CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Amount	4
Total
Intangible Assets Acquired Through Business Combinations
Amount	$ 58