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Financial Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Derivative assets
Gross Amount Recognized	$ 515	$ 121
Gross Amount Offset	0	0
Net Amount Presented	515	121
Gross Amounts Not Offset
Derivatives	112	108
Financial Collateral	299	4
Net Amount	104	9
Derivative liabilities
Gross Amount Recognized	195	372
Gross Amount Offset	0	0
Net Amount Presented	195	372
Gross Amounts Not Offset
Derivatives	112	108
Financial Collateral	69	219
Net Amount	$ 14	$ 45
Period to collateralize	2 days	2 days

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