Commitments and Contingencies (Additional Information) (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended			36 Months Ended
	May 12, 2016	Jan. 25, 2014	Oct. 26, 2013	Apr. 28, 2012	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014	Jul. 30, 2016
Site Contingency [Line Items]
Rent expense					$ 385.0	$ 394.0	$ 413.0
Purchase Commitments					3,896.0	4,078.0		$ 3,896.0
Liability for purchase commitments					159.0	156.0		159.0
Future compensation expense & contingent consideration (maximum)					328.0			328.0
Commitments and contingencies
Volume of channel partner financing					26,900.0	25,900.0	24,600.0
Balance of the channel partner financing subject to guarantees					1,100.0	1,200.0		1,100.0
Financing provided by third parties for leases and loans related to End Users on which the Company has provided guarantees					63.0	107.0	129.0
Cost of Goods Sold					14,161.0	15,377.0	15,641.0
Brazilian Authority Claim Of Import Tax Evasion By Importer Tax Portion					249.0			249.0
Brazilian Authority Claim Of Import Tax Evasion By Importer Interest Portion					1,300.0			1,300.0
Brazilian Authority Claim Of Import Tax Evasion By Importer Penalties Portion					$ 1,200.0			1,200.0
Minimum
Site Contingency [Line Items]
Warranty period for products, in days					90 days
Channel partners revolving short-term financing payment term					60 days
Maximum
Site Contingency [Line Items]
Warranty period for products, in years					5 years
Channel partners revolving short-term financing payment term					90 days
End User Lease And Loan Term					3 years
Insieme Networks Inc
Site Contingency [Line Items]
Initial Funding				$ 100.0
Ownership percentage as a result of investment			83.00%
Labor and Related Expense					$ 160.0	207.0	$ 416.0	783.0
Description of expected milestone payment					the Company expects to pay approximately $325 million pursuant to the second milestone payment and continued vesting of the first milestone payment.
Insieme Networks Inc | Maximum | Including compensation that has been expensed through current reporting period [Member]
Site Contingency [Line Items]
Commitments and contingencies					$ 836.0			836.0
Insieme Networks Inc | 1st milestone payment in FY16
Site Contingency [Line Items]
Milestone payment					389.0
Insieme Networks Inc | 2nd milestone payment in Q1FY17 (Expected)
Site Contingency [Line Items]
Milestone payment					325.0
Investments In Privately Held Companies
Site Contingency [Line Items]
Commitments and contingencies					222.0	205.0		222.0
Supplier Component Remediation Liability
Site Contingency [Line Items]
Commitments and contingencies			$ 63.0		276.0	408.0		$ 276.0
Cost of Goods Sold		$ 655.0
Supplier Component Remediation Liability | Cost of Goods, Product Line [Member]
Site Contingency [Line Items]
Product Warranty Accrual, Preexisting, Increase (Decrease)					$ 74.0	$ 164.0
Backflip Software [Member]
Site Contingency [Line Items]
Loss Contingency, Lawsuit Filing Date					March 5, 2013
SRI International [Member]
Site Contingency [Line Items]
Loss Contingency, Lawsuit Filing Date					September 4, 2013
Loss Contingency, Damages Awarded, Value	$ 23.7
SSL
Site Contingency [Line Items]
Loss Contingency, Lawsuit Filing Date					March 25, 2015
Kangtega [Member]
Site Contingency [Line Items]
Loss Contingency, Lawsuit Filing Date					June 6, 2013