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Supplementary Financial Information - Interest and other, net (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense on borrowings	$ (312)	$ (309)	$ (273)
Loss on extinguishment of debt	(126)	0	0
Tax indemnifications	(662)	47	472
Other, net	49	19	13
Interest and other, net	(1,051)	$ (243)	$ 212
Adjustment to indemnification receivable	$ 676

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Change in Tax Indemnification

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of income (expense) related to nonoperating activities, classified as other.

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