Balance Sheet Detail (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 27, 2019	Oct. 28, 2018
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 3,922	$ 3,812
Accumulated depreciation	(2,466)	(2,405)
Property, Plant and Equipment, Net	1,456	1,407
Land and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	245	245
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,460	1,448
Buildings and improvements | Min
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Buildings and improvements | Max
Property, Plant and Equipment [Line Items]
Useful Life	30 years
Demonstration and manufacturing equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,335	1,282
Demonstration and manufacturing equipment | Min
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Demonstration and manufacturing equipment | Max
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 639	634
Furniture, fixtures and other equipment | Min
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Furniture, fixtures and other equipment | Max
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 243	$ 203