Commitments and Contingencies (Additional Information) (Details) (USD $)	3 Months Ended			3 Months Ended					15 Months Ended			3 Months Ended				3 Months Ended		3 Months Ended
	Oct. 25, 2014	Oct. 26, 2013	Jul. 26, 2014	Oct. 25, 2014 Minimum	Oct. 25, 2014 Maximum	Oct. 25, 2014 Insieme Networks Inc	Oct. 26, 2013 Insieme Networks Inc	Apr. 28, 2012 Insieme Networks Inc	Oct. 25, 2014 Insieme Networks Inc	Oct. 25, 2014 Investments In Privately Held Companies	Jul. 26, 2014 Investments In Privately Held Companies	Jan. 25, 2014 Supplier Component Remediation Liability	Oct. 25, 2014 Supplier Component Remediation Liability	Jul. 26, 2014 Supplier Component Remediation Liability	Oct. 26, 2013 Supplier Component Remediation Liability	Oct. 25, 2014 Russia and the Commonwealth of Independent States [Member]	Oct. 25, 2014 Including compensation that has been expensed through current reporting period [Member] Insieme Networks Inc Maximum	Oct. 25, 2014 Cost of sales Rockstar [Member]
Site Contingency [Line Items]
Purchase Commitments	$ 4,299,000,000		$ 4,169,000,000
Liability for purchase commitments	169,000,000		162,000,000
Future compensation expense & contingent consideration	528,000,000
Variable Interest Entities Investment								100,000,000
Ownership percentage as a result of investment							83.00%
Compensation expense related to acquisitions						53,000,000	257,000,000		469,000,000
Commitments and contingencies										252,000,000	255,000,000		639,000,000	670,000,000	63,000,000		853,000,000
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	6,300,000,000	6,300,000,000
Balance of the channel partner financing subject to guarantees	1,300,000,000		1,200,000,000
End User Lease And Loan Term	3 years
Financing provided by third parties for leases and loans on which the Company has provided guarantees	26,000,000	25,000,000
Cost of Goods Sold	3,919,000,000	3,747,000,000										655,000,000
Brazilian Authority Claim Of Import Tax Evasion By Importer Tax Portion	348,000,000
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	1,500,000,000
Percentage of revenue, Percentage																2.00%
Accrual for legal contingency																		$ 188,000,000