Accounting for Leases as a Lessor - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Leases [Abstract]
Financing receivable term, low end of range	2 years
Financing receivable term, high end of range	5 years
Financing receivable sold	$ 50	$ 73