Goodwill and Purchased Intangible Assets (Schedule Of Intangible Assets Acquired Through Business Combinations) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jan. 24, 2015
Intangible Assets Acquired Through Business Combinations
Amount	$ 69
IPR&D
Intangible Assets Acquired Through Business Combinations
Amount	6
TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Amount	49
CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Amount	14
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
All others (two in total)
Intangible Assets Acquired Through Business Combinations
Amount	40
All others (two in total) \| IPR&D
Intangible Assets Acquired Through Business Combinations
Amount	4
All others (two in total) \| TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Amount	25
All others (two in total) \| CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	8 years 1 month 6 days
Amount	11
Total
Intangible Assets Acquired Through Business Combinations
Amount	$ 69

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination.

+ References

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