Financial Instruments - Schedule of Information Related to the Potential Effect of Entity's Master Netting Agreements and Collateral Security Agreements (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2020	Oct. 31, 2019
Derivative assets
Gross Amount Recognized	$ 199	$ 392
Gross Amount Offset	0	0
Net Amount Presented	199	392
Gross Amounts Not Offset
Derivatives	154	113
Financial Collateral	9	259
Net Amount	36	20
Derivative liabilities
Gross Amount Recognized	444	166
Gross Amount Offset	0	0
Net Amount Presented	444	166
Gross Amounts Not Offset
Derivatives	154	113
Financial Collateral	249	43
Net Amount	$ 41	$ 10
Period to collateralize	2 days