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GUARANTEES (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Guarantees [Abstract]        
Standard Product Warranty Description Keysight warranties on products sold through direct sales channels are primarily for one year. Warranties for products sold through distribution channels are primarily for three years.      
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 38 $ 45    
Accruals for warranties, including change in estimates 24 28    
Settlements made during the period (29) (35)    
Ending balance 33 38    
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]        
Accruals for warranties due within one year     $ 20 $ 23
Accruals for warranties due after one year     13 15
Ending balance at October 31 $ 33 $ 38 $ 33 $ 38