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Accounting for Leases as a Lessor - Allowance for Doubtful Accounts for Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2020	Oct. 31, 2018
Allowance for doubtful accounts
Balance at beginning of period	$ 131
Provision for doubtful accounts	5	$ 33
Write-offs	(3)	(22)
Balance at end of period	$ 133	$ 120

X

- Definition

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

+ References

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

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