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, 2020	Oct. 31, 2019
Derivative assets
Gross Amount Recognized	$ 564	$ 392
Gross Amount Offset	0	0
Net Amount Presented	564	392
Gross Amounts Not Offset
Derivatives	112	113
Financial Collateral	497	259
Net Amount	(45)	20
Derivative liabilities
Gross Amount Recognized	144	166
Gross Amount Offset	0	0
Net Amount Presented	144	166
Gross Amounts Not Offset
Derivatives	112	113
Financial Collateral	29	43
Net Amount	$ 3	$ 10
Period to collateralize	2 days