Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jan. 24, 2015
Goodwill [Roll Forward]
Balance	$ 24,239us-gaap_Goodwill
Acquisitions	168us-gaap_GoodwillAcquiredDuringPeriod
Other	(25)
Balance	24,382us-gaap_Goodwill
Americas
Goodwill [Roll Forward]
Balance	15,080
Acquisitions	89
Other	(13)
Balance	15,156
EMEA
Goodwill [Roll Forward]
Balance	5,715
Acquisitions	63
Other	(7)
Balance	5,771
APJC
Goodwill [Roll Forward]
Balance	3,444
Acquisitions	16
Other	(5)
Balance	$ 3,455

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 45

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

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-Section 50

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

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