Financing Receivables and Operating Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Apr. 30, 2019	Apr. 30, 2018
Leases [Abstract]
Financing receivable term, low end of range	2 years
Financing receivable term, high end of range	5 years
Financing receivable sold	$ 73	$ 71

The amount of any significant sales of financing receivables during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableSignificantSales
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration