Commitments and Contingencies (Additional Information) (Details) (USD $)	12 Months Ended					3 Months Ended		12 Months Ended			3 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012	Jul. 26, 2014 Minimum	Jul. 26, 2014 Maximum	Oct. 26, 2013 Insieme Networks Inc	Apr. 28, 2012 Insieme Networks Inc	Jul. 26, 2014 Insieme Networks Inc	Jul. 26, 2014 Investments In Privately Held Companies	Jul. 27, 2013 Investments In Privately Held Companies	Jan. 25, 2014 Supplier Component Remediation Liability	Jul. 26, 2014 Supplier Component Remediation Liability	Oct. 26, 2013 Supplier Component Remediation Liability
Site Contingency [Line Items]
Rent expense	$ 413,000,000	$ 416,000,000	$ 404,000,000
Purchase Commitments	4,169,000,000	4,033,000,000
Liability for purchase commitments	162,000,000	172,000,000
Future compensation expense & contingent consideration	574,000,000
Variable Interest Entities Investment							100,000,000
Ownership percentage as a result of investment						83.00%
Compensation expense related to acquisitions								416,000,000
Commitments and contingencies								855,000,000	255,000,000	263,000,000		670,000,000	63,000,000
Warranty period for products, in days				90 days
Warranty period for products, in years					5 years
Channel partners revolving short-term financing payment term				60 days	90 days
Volume of channel partner financing	24,600,000,000	23,800,000,000	21,300,000,000
Balance of the channel partner financing subject to guarantees	1,200,000,000	1,400,000,000
End User Lease And Loan Term	3 years				3 years
Financing provided by third parties for leases and loans on which the Company has provided guarantees	129,000,000	185,000,000	227,000,000
Cost of Goods Sold	15,641,000,000	15,541,000,000	14,505,000,000								655,000,000
Brazilian Authority Claim Of Import Tax Evasion By Importer Tax Portion	389,000,000
Brazilian Authority Claim Of Import Tax Evasion By Importer Interest Portion	1,300,000,000
Brazilian Authority Claim Of Import Tax Evasion By Importer Penalties Portion	$ 1,700,000,000
Percentage of revenue, Percentage	2.00%