Supplementary Financial Information - Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2019	Nov. 01, 2018	Oct. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Value-added taxes receivable	$ 881		$ 865
Available-for-sale investments	425		711
Supplier and other receivables	2,217		2,025
Prepaid and other current assets(2)	1,284		1,445
Other current assets	4,807	$ 5,159	$ 5,046
Capitalized Contract Cost [Line Items]
Amortization	21
Deferred contract fulfillment costs
Capitalized Contract Cost [Line Items]
Deferred contract costs	38
Contract acquisition costs
Capitalized Contract Cost [Line Items]
Deferred contract costs	$ 36

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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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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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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