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Financial Instruments - Schedule of Information Related to the Potential Effect of Entity's Master Netting Agreements and Collateral Security Agreements (Details) - USD ($) $ in Millions	6 Months Ended
	Apr. 30, 2021	Oct. 31, 2020
Derivative assets
Gross Amount Recognized	$ 97	$ 195
Gross Amount Offset	0	0
Net Amount Presented	97	195
Gross Amounts Not Offset
Derivatives	89	156
Financial Collateral	0	4
Net Amount	8	35
Derivative liabilities
Gross Amount Recognized	352	262
Gross Amount Offset	0	0
Net Amount Presented	352	262
Gross Amounts Not Offset
Derivatives	89	156
Financial Collateral	316	130
Net Amount	$ (53)	$ (24)
Period to collateralize	2 days

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