Goodwill And Purchased Intangible Assets (Scedule Of Goodwill By Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified									3 Months Ended
Oct. 27, 2012	Jul. 28, 2012	Oct. 27, 2012 Americas [Member]	Jul. 28, 2012 Americas [Member]	Oct. 27, 2012 Europe Middle East And Africa [Member]	Jul. 28, 2012 Europe Middle East And Africa [Member]	Oct. 27, 2012 Asia Pacific Japan And China [Member]	Jul. 28, 2012 Asia Pacific Japan And China [Member]	Oct. 27, 2012 NDS Group Limited [Member]	Oct. 27, 2012 NDS Group Limited [Member] Americas [Member]	Oct. 27, 2012 NDS Group Limited [Member] Europe Middle East And Africa [Member]	Oct. 27, 2012 NDS Group Limited [Member] Asia Pacific Japan And China [Member]	Oct. 27, 2012 Other Acquisition [Member]	Oct. 27, 2012 Other Acquisition [Member] Americas [Member]	Oct. 27, 2012 Other Acquisition [Member] Europe Middle East And Africa [Member]	Oct. 27, 2012 Other Acquisition [Member] Asia Pacific Japan And China [Member]
Balance, beginning	$ 20,443	$ 16,998	$ 12,986	$ 11,755	$ 4,614	$ 3,287	$ 2,843	$ 1,956
Acquisitions									3,444	1,230	1,327	887	1	1	0	0
Balance, ending	$ 20,443	$ 16,998	$ 12,986	$ 11,755	$ 4,614	$ 3,287	$ 2,843	$ 1,956

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-Clause 1

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph l

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details