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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	3 Months Ended
	Jan. 31, 2019	Oct. 31, 2018
Derivative assets
Gross Amount Recognized	$ 278	$ 515
Gross Amount Offset	0	0
Net Amount Presented	278	515
Gross Amounts Not Offset
Derivatives	118	112
Financial Collateral	156	299
Net Amount	4	104
Derivative liabilities
Gross Amount Recognized	220	195
Gross Amount Offset	0	0
Net Amount Presented	220	195
Gross Amounts Not Offset
Derivatives	118	112
Financial Collateral	59	69
Net Amount	$ 43	$ 14
Period to collateralize	2 days

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