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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Tax indemnifications receivable	$ 953	$ 1,695
Deferred tax assets	2,431	342
Other	1,685	1,058
Other non-current assets, total	5,069	3,095
Adjustment to indemnification receivable	676
Intangible assets	453	3
Available-for-sale investments	$ 53	$ 61

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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