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Accounting for Leases as a Lessor - Summary of Aging and Non-accrual Status of Gross Financing Receivables (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	$ 9,198	$ 9,058
Gross financing receivables on non-accrual status	257	364
Gross financing receivables 90 days past due and still accruing interest	78	74
Billed Revenues | Current 1-30 days
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	410	340
Billed Revenues | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	35	43
Billed Revenues | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	17	22
Billed Revenues | Past due >90 days
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	111	140
Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, gross	$ 8,625	$ 8,513

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