RESTRUCTURING (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Activities, Description       We initiated a targeted workforce reduction program in November 2016 that is expected to reduce Keysight's total headcount by between 60 to 200 employees. The timing and scope of workforce reductions will vary based on local legal requirements. This targeted workforce management program was designed to support our site consolidation strategy, align with our new industry segment structure and improve efficiency.    
Restructuring and Related Cost Expected Number of Positions Eliminated Minimum       60    
Restructuring And Related Cost Expected Number Of Positions Eliminated Maximum       200    
Restructuring and Related Cost, Number of Positions Eliminated       50    
Restructuring Reserve $ 1 $ 2   $ 1   $ 0
Payments for Restructuring (2) 0        
Restructuring Charges 1 $ 2 $ 0 3 $ 0  
Cost of products and services            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 0   0 1 0  
Research and development            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 1   0 1 0  
Selling, general and administrative            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 0   $ 0 $ 1 $ 0  
WORKFORCE REDUCTION [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Activities, Initiation Date       Nov. 30, 2016    
Other accrued liabilities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve $ 1     $ 1