Commitments and Contingencies (Additional Information) (Details) $ in Millions		3 Months Ended					6 Months Ended		12 Months Ended	24 Months Ended	27 Months Ended	42 Months Ended
	May 12, 2016 USD ($)	Jan. 28, 2017 USD ($)	Jan. 23, 2016 USD ($)	Jan. 25, 2014 USD ($)	Jul. 27, 2013	Apr. 28, 2012 USD ($)	Jan. 28, 2017 USD ($)	Jan. 23, 2016 USD ($)	Sep. 04, 2014 patent	Dec. 31, 2016 USD ($)	Oct. 29, 2016 USD ($)	Jan. 28, 2017 USD ($)	Jul. 30, 2016 USD ($)
Contingency [Line Items]
Purchase commitments		$ 4,402.0					$ 4,402.0					$ 4,402.0	$ 3,896.0
Liability for purchase commitments		172.0					172.0					172.0	159.0
Future compensation expense & contingent consideration (up to)		220.0					220.0					220.0
Volume of channel partner financing		6,300.0	$ 6,500.0				13,200.0	$ 13,400.0
Balance of the channel partner financing subject to guarantees		1,200.0					1,200.0					1,200.0	1,100.0
Financing provided by third parties for leases and loans on which the Company has provided guarantees		30.0	16.0				36.0	39.0
Charge to product cost of sales		3,305.0	3,480.0				6,708.0	7,333.0
Adjustments to product cost of sales							3.0	13.0
Commitments and contingencies
Brazilian authority claim of import tax evasion by importer tax portion		258.0					258.0					258.0
Brazilian authority claim of import tax evasion by importer interest portion		1,400.0					1,400.0					1,400.0
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
Damages from Product Defects
Contingency [Line Items]
Charge for expected remediation		125.0
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		12.0	$ 50.0				$ 32.0	101.0			$ 815.0
Payments to acquire additional interest in subsidiaries							422.0	$ 354.0				811.0
Insieme Networks Inc | Including compensation that has been expensed through current reporting period | Maximum
Contingency [Line Items]
Commitments and contingencies		831.0					831.0					831.0
Supplier Component Remediation Liability
Contingency [Line Items]
Charge to product cost of sales				$ 655.0
Commitments and contingencies		105.0					$ 105.0					$ 105.0	$ 276.0
Supplier Component Remediation Liability | Cost of Goods, Product Line
Contingency [Line Items]
Adjustments to product cost of sales		$ 141.0								$ 238.0