Financial Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Derivative assets
Gross Amount Recognized	$ 195	$ 392
Gross Amount Offset	0	0
Net Amount Presented	195	392
Gross Amounts Not Offset
Derivatives	156	113
Financial Collateral	4	259
Net Amount	35	20
Derivative liabilities
Gross Amount Recognized	262	166
Gross Amount Offset	0	0
Net Amount Presented	262	166
Gross Amounts Not Offset
Derivatives	156	113
Financial Collateral	130	43
Net Amount	$ (24)	$ (10)
Period to collateralize	2 days