Fair Value (Additional Information) (Details) - USD ($) $ in Millions	Jul. 25, 2015	Jul. 26, 2014
Fair Value Measurements [Line Items]
Carrying Value, Cost Method Investments	$ 319	$ 269
Senior notes, carrying value	25,351	20,837
Level 2
Fair Value Measurements [Line Items]
Senior notes, fair value	26,600	22,400
Level 3
Fair Value Measurements [Line Items]
Long term loan receivables and financed service contracts and others carrying value	2,200	$ 2,100
Investments In Privately Held Companies [Member] \| Level 3
Fair Value Measurements [Line Items]
Remaining carrying value of nonrecurring investment after impairment	36
Purchased Intangible Assets [Member] \| Level 3
Fair Value Measurements [Line Items]
Remaining carrying value of nonrecurring investment after impairment	$ 5

Loan receivables and financed service contracts and others carrying value.

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- Definition

Remaining carrying value of nonrecurring investment after impairment

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 25

-Paragraph 1

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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