Financing Receivables And Guarantees (Additional Information) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 26, 2014 D	Apr. 27, 2013	Jul. 27, 2013
Financing Receivables And Guarantees [Line Items]
Average term of lease arrangements (in years)			4 years
Term of Loan Receivable Arrangement			3 years
Deferred Revenue	$ 13,151,000,000		$ 13,151,000,000		$ 13,423,000,000
Financing receivable, allowance for credit loss and deferred revenue	1,989,000,000		1,989,000,000		2,453,000,000
Gross Receivables, Net of Unearned Income	7,968,000,000	8,073,000,000	7,968,000,000	8,073,000,000	8,292,000,000
Threshold period for past due receivables (in days)	31 days
Unbilled Or Current In Greater Than Ninety Days Past Due	295,000,000		295,000,000		406,000,000
Financing Receivable, Over 90 Days Past Due and Still Accruing	88,000,000		88,000,000		87,000,000
Risk rating for receivables deemed to be impaired, minimum (Credit risk rating)			8
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	5,800,000,000	5,800,000,000	17,900,000,000	17,200,000,000
Balance of the channel partner financing subject to guarantees	1,100,000,000		1,100,000,000		1,400,000,000
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	44,000,000	38,000,000	89,000,000	137,000,000
Minimum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			1
Maximum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			10
Financed Service Contracts And Other
Financing Receivables And Guarantees [Line Items]
Deferred Revenue	$ 1,592,000,000		$ 1,592,000,000		$ 2,036,000,000
Financed Service Contracts And Other | Minimum
Financing Receivables And Guarantees [Line Items]
Services revenue recognized ratably (in years)			1 year
Financed Service Contracts And Other | Maximum
Financing Receivables And Guarantees [Line Items]
Services revenue recognized ratably (in years)			3 years
Investment Grade | Minimum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			1
Investment Grade | Maximum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			4
Non-investment Grade | Minimum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			5
Non-investment Grade | Maximum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			6
Substandard | Minimum
Financing Receivables And Guarantees [Line Items]
Financing Receivable (Credit Risk Rating)			7