Accounting for Leases as a Lessor - Credit Risk Profile of Gross Financing Receivables (Details) - USD ($) $ in Millions	Apr. 30, 2020	Oct. 31, 2019
Gross financing receivables
Gross financing receivables	$ 8,678	$ 8,652
Low
Gross financing receivables
Gross financing receivables	4,458	4,432
Moderate
Gross financing receivables
Gross financing receivables	3,960	3,933
High
Gross financing receivables
Gross financing receivables	$ 260	$ 287

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant