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Financial Instruments - Pre-tax Effect of Derivative Instruments in Hedging Relationships on OCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ 45	$ 296	$ (284)	$ 371
Total	42	408	(361)	504
Expected amount of AOCI expected to be reclassified in the next 12 months	14		14
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	45	301	(284)	377
Gains (Losses) Recognized in OCI on Derivatives in Net Investment Hedging Relationship	(3)	112	(77)	133
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ 0	$ (5)	$ 0	$ (6)

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Other Comprehensive Income (Loss), Derivative Cash Flow and Net Investment Hedges, Increase (Decrease), Before Adjustments and Tax

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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