Financing Receivables And Guarantees (Additional Information) (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	3 Months Ended			6 Months Ended
	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014 D	Jan. 26, 2013	Jul. 27, 2013	Jan. 25, 2014 Minimum	Oct. 26, 2013 Maximum	Jan. 25, 2014 Financed Service Contracts And Other	Jul. 27, 2013 Financed Service Contracts And Other	Jan. 25, 2014 Financed Service Contracts And Other Minimum	Jan. 25, 2014 Financed Service Contracts And Other Maximum	Jan. 25, 2014 Investment Grade Minimum	Jan. 25, 2014 Investment Grade Maximum	Jan. 25, 2014 Non-investment Grade Minimum	Jan. 25, 2014 Non-investment Grade Maximum	Jan. 25, 2014 Substandard Minimum
Financing Receivables And Guarantees [Line Items]
Average term of lease arrangements (in years)			4 years
Term of Loan Receivable Arrangement			3 years
Services revenue recognized ratably (in years)										1 year	3 years
Deferred Revenue	$ 13,244,000,000		$ 13,244,000,000		$ 13,423,000,000			$ 1,621,000,000	$ 2,036,000,000
Financing Receivable (Credit Risk Rating)						1	10					1	4	5	6	7
Financing receivable, allowance for credit loss and deferred revenue	2,039,000,000		2,039,000,000		2,453,000,000
Gross Financing Receivable, Net of Unearned	8,018,000,000	8,092,000,000	8,018,000,000	8,092,000,000	8,292,000,000
Threshold period for past due receivables (in days)	31 days
Unbilled Or Current In Greater Than Ninety Days Past Due	289,000,000		289,000,000		406,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	57,000,000		57,000,000		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	5,900,000,000	5,800,000,000	12,200,000,000	11,400,000,000
Balance of the channel partner financing subject to guarantees	1,300,000,000		1,300,000,000		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	$ 20,000,000	$ 55,000,000	$ 45,000,000	$ 99,000,000