Financial Instruments - Offsetting Assets and Liabilities (Details) $ in Millions	Apr. 30, 2021 USD ($) business_day	Oct. 31, 2020 USD ($) business_day
Derivative assets
Gross Amount Recognized	$ 303	$ 510
Gross Amount Offset	0	0
Net Amount Presented	303	510
Gross Amounts Not Offset
Derivatives	177	137
Financial Collateral	82	321
Net Amount	44	52
Derivative liabilities
Gross Amount Recognized	299	194
Gross Amount Offset	0	0
Net Amount Presented	299	194
Gross Amounts Not Offset
Derivatives	177	137
Financial Collateral	150	55
Net Amount	$ (28)	$ 2
Business days prior to respective reporting date | business_day	2	2
Cash collateral	$ 70
Counterparty collateral	$ 80	$ 55