Financial Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Derivative assets
Gross Amount Recognized	$ 392	$ 515
Gross Amount Offset	0	0
Net Amount Presented	392	515
Gross Amounts Not Offset
Derivatives	113	112
Financial Collateral	259	299
Net Amount	20	104
Derivative liabilities
Gross Amount Recognized	166	195
Gross Amount Offset	0	0
Net Amount Presented	166	195
Gross Amounts Not Offset
Derivatives	113	112
Financial Collateral	43	69
Net Amount	$ 10	$ 14
Period to collateralize	2 days	2 days