LEASES - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2020	Jul. 31, 2020
Leases [Abstract]
Operating Lease Cost	$ 14	$ 45
Short-term Lease Cost	0	1
Variable Lease Cost	4	11
Sublease Income	(4)	(11)
Total Lease Cost	$ 14	$ 46