Supplementary Financial Information - Accounts Receivables, net (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2018	Oct. 31, 2017
Accounts Receivable, Net
Accounts receivable				$ 5,242	$ 4,515
Allowance for doubtful accounts	$ (101)	$ (107)	$ (80)	(129)	(101)
Accounts receivable, net				$ 5,113	$ 4,414
Allowance for Doubtful Accounts Receivable
Balance at beginning of year	101	107	80
Provision for doubtful accounts	57	30	65
Deductions, net of recoveries	(29)	(36)	(38)
Balance at end of year	$ 129	$ 101	$ 107

Amount of deductions of receivables doubtful of collection, net of recoveries that were previously charged off.

No definition available.

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- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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- References

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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- 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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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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