Financing Receivables and Guarantees - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 27, 2013 D	Jul. 28, 2012	Jul. 30, 2011
Financing Receivables And Guarantees [Line Items]
Average term of lease arrangements	4 years
Average term of loan arrangements	3 years
Financing receivable, allowance for credit loss and deferred revenue	$ 2,453,000,000	$ 2,387,000,000
Financing Receivable, Gross	8,292,000,000	7,626,000,000	6,966,000,000
Unbilled or current financing receivables included in greater than 91 days plus past due	406,000,000	455,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	87,000,000	109,000,000
Channel partners revolving short-term financing payment term, minimum (days)	60
Channel partners revolving short-term financing payment term, maximum (days)	90
Volume of channel partner financing	23,800,000,000	21,300,000,000	18,200,000,000
Balance of the channel partner financing subject to guarantees	1,400,000,000	1,200,000,000
End User Lease And Loan Term Maximum	3 years
Financing provided by third parties for leases and loans on which the Company has provided guarantees	185,000,000	227,000,000	247,000,000
Lease Receivables
Financing Receivables And Guarantees [Line Items]
Financing Receivable, Gross	3,507,000,000	3,179,000,000	2,861,000,000
Loan Receivables
Financing Receivables And Guarantees [Line Items]
Financing Receivable, Gross	1,649,000,000	1,796,000,000	1,468,000,000
Financed Service Contracts & Other
Financing Receivables And Guarantees [Line Items]
Deferred Revenue	(2,036,000,000)	(1,838,000,000)
Financing Receivable, Gross	$ 3,136,000,000	$ 2,651,000,000	$ 2,637,000,000
Financed Service Contracts & Other | Maximum
Financing Receivables And Guarantees [Line Items]
Revenue recognition range, low end	3 years
Financed Service Contracts & Other | Minimum
Financing Receivables And Guarantees [Line Items]
Revenue recognition range, low end	1 year
Pass [Member] | Maximum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	1
Pass [Member] | Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	4
Special Mention [Member] | Maximum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	5
Special Mention [Member] | Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	6
Substandard [Member] | Minimum
Financing Receivables And Guarantees [Line Items]
Financing credit risk rating-investment-lowest	7