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Brazilian authority claim of import tax evasion by importer penalties portion

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Brazilian authority claim of import tax evasion by importer, tax portion

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Commitments and Contingencies (Additional Information) (Details) $ in Millions		3 Months Ended					12 Months Ended			27 Months Ended	39 Months Ended
	May 12, 2016 USD ($)	Oct. 29, 2016 USD ($)	Oct. 24, 2015 USD ($)	Jan. 25, 2014 USD ($)	Jul. 27, 2013	Apr. 28, 2012 USD ($)	Jul. 30, 2016 USD ($)	Jul. 25, 2015 USD ($)	Sep. 04, 2014 patent	Oct. 29, 2016 USD ($)	Oct. 29, 2016 USD ($)	Oct. 26, 2013 USD ($)
Contingency [Line Items]
Purchase commitments		$ 3,920.0					$ 3,896.0			$ 3,920.0	$ 3,920.0
Liability for purchase commitments		161.0					159.0			161.0	161.0
Future compensation expense & contingent consideration, maximum		299.0								299.0	299.0
Commitments and contingencies
Volume of channel partner financing		6,900.0	$ 6,900.0
Balance of the channel partner financing subject to guarantees		1,000.0					1,100.0			1,000.0	1,000.0
Financing provided by third parties for leases and loans on which the Company has provided guarantees		6.0	23.0
Charge to product cost of sales		3,403.0	3,853.0
Adjustments to product cost of sales		0.0	10.0
Brazilian authority claim of import tax evasion by importer tax portion		253.0								253.0	253.0
Brazilian authority claim of import tax evasion by importer interest portion		1,300.0								1,300.0	1,300.0
Brazilian authority claim of import tax evasion by importer penalties portion		$ 1,200.0								1,200.0	1,200.0
SRI International
Contingency [Line Items]
Damages awarded, value	$ 23.7
SRI International \| Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents \| patent									2
Maximum
Contingency [Line Items]
Warranty period for products, in years		5 years
Channel partners revolving short-term financing payment term, in days		90 days
End user lease and loan term, in years		3 years
Minimum
Contingency [Line Items]
Warranty period for products, in days		90 days
Channel partners revolving short-term financing payment term, in days		60 days
Insieme Networks Inc
Contingency [Line Items]
Variable interest entities investment						$ 100.0
Ownership percentage as a result of investment					83.00%
Compensation expense related to acquisitions		$ 20.0	51.0							803.0
Payments to acquire additional interest in subsidiaries		323.0	$ 291.0								712.0
Insieme Networks Inc \| Including compensation that has been expensed through current reporting period \| Maximum
Contingency [Line Items]
Commitments and contingencies		834.0								834.0	834.0
Supplier Component Remediation Liability
Contingency [Line Items]
Commitments and contingencies		$ 265.0					276.0			$ 265.0	$ 265.0	$ 63.0
Charge to product cost of sales				$ 655.0
Supplier Component Remediation Liability \| Cost of Goods, Product Line
Contingency [Line Items]
Adjustments to product cost of sales							$ 74.0	$ 164.0