Financing Receivables and Operating Leases (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 30, 2016	Jul. 25, 2015
Financing Receivables And Guarantees [Line Items]
Average lease term (in years)	4 years
Deferred revenue:	$ 16,472	$ 15,183
Financing receivable, allowance for credit loss and deferred revenue	2,112	2,253
Total financing receivables before allowance for credit loss	$ 8,805	8,731
Threshold for past due receivables (in days)	31 days
Unbilled or current financing receivables included in greater than 91 days plus past due	$ 670	496
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 144	70
Minimum
Financing Receivables And Guarantees [Line Items]
Financed service contracts term (in years)	1 year
Maximum
Financing Receivables And Guarantees [Line Items]
Loan receivables term (in years)	3 years
Financed service contracts term (in years)	3 years
Investment-grade \| Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	1
Investment-grade \| Maximum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	4
Non-investment grade \| Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	5
Non-investment grade \| Maximum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	6
Substandard \| Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	7
Financed Service Contracts and Other
Financing Receivables And Guarantees [Line Items]
Deferred revenue:	$ 1,716	$ 1,853
Financed Service Contracts and Other \| Minimum
Financing Receivables And Guarantees [Line Items]
Financed service contracts term (in years)	1 year
Financed Service Contracts and Other \| Maximum
Financing Receivables And Guarantees [Line Items]
Financed service contracts term (in years)	3 years

Average term of lease arrangements.

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- Definition

Financing credit loss allowances and deferred revenue.

+ References

No definition available.

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- Definition

Financing Receivables And Guarantees [Line Items]

+ References

No definition available.

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- Definition

Service Agreement Term

+ References

No definition available.

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- Definition

Term of loan receivable arrangement.

+ References

No definition available.

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- Definition

Threshold for past due receivables

+ References

No definition available.

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- Definition

Unbilled or current in greater than ninety days past due.

+ References

No definition available.

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

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- Definition

Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 29
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953659-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953664-111524

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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