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OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 12 Months Ended
Oct. 22, 2014
shares
Oct. 01, 2014
shares
Apr. 30, 2013
Oct. 31, 2015
USD ($)
segment
Oct. 31, 2014
USD ($)
Oct. 31, 2013
USD ($)
Property, Plant and Equipment [Line Items]            
Share-based compensation expense       $ 55,000,000 $ 44,000,000 $ 43,000,000
Calculated warranty term     1 year 3 years    
Number of reportable segments | segment       2    
Number of operating segments | segment       2    
Goodwill, impairment loss       $ 0 0 0
Impairment of acquired finite-lived intangible assets       0 0 0
Advertising expense       27,000,000 22,000,000 16,000,000
Cost method investment, carrying value       4,000,000    
Investments, fair value       0    
Impairment charge       4,000,000 0 0
Cash and cash equivailient held outside US       338,000,000    
Fair value of our long-term debt exceeeds (below) the carrying value       $ (8,000,000) 1,000,000  
Operating lease, term of renewal contract       10 years    
Accrued vacation benefits       $ 63,000,000 70,000,000  
Foreign currency translation net gain (loss)       5,000,000 0 (4,000,000)
In Process Research and Development [Member]            
Property, Plant and Equipment [Line Items]            
Impairment of intangible assets       $ 0 $ 0 $ 1,000,000
Minimum [Member]            
Property, Plant and Equipment [Line Items]            
Finite lived intangible assets useful life       6 months    
Operating lease, term of contract       1 year    
Maximum [Member]            
Property, Plant and Equipment [Line Items]            
Finite lived intangible assets useful life       15 years    
Operating lease, term of contract       25 years    
Machinery and Equipment [Member] | Minimum [Member]            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment - useful life       3 years    
Machinery and Equipment [Member] | Maximum [Member]            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment - useful life       10 years    
Software Development [Member] | Minimum [Member]            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment - useful life       3 years    
Software Development [Member] | Maximum [Member]            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment - useful life       5 years    
Common Stock [Member]            
Property, Plant and Equipment [Line Items]            
Number of Keysight shares issued per 2 shares of Agilent | shares 1          
Shares issued to Agilent shareholders | shares   167,000,000