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Supplementary Financial Information - Other Current Assets (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Value-added taxes receivable	$ 865	$ 857
Available-for-sale investments	711	1,149
Supplier and other receivables	2,025	1,891
Prepaid and other current assets	1,445	1,224
Other current assets, total	$ 5,046	$ 5,121

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of current assets classified as other.

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Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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