Financing Receivables and Operating Leases - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Leases [Abstract]
Financing receivable term, low end of range	2 years
Financing receivable term, high end of range	5 years
Sold	$ 130	$ 101
Period past due, after which a write-off or specific reserve is created	180 days
Period past due, after which account is put on non-accrual status	90 days