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LEASES - Lease Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Leases [Abstract]      
Operating Lease, Cost $ 60    
Short-term Lease, Cost 1    
Variable Lease, Cost 14    
Sublease Income (14)    
Lease, Cost $ 61    
Total rent expense   $ 75 $ 64