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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, 2021
Oct. 31, 2020
Derivative assets    
Gross Amount Recognized $ 97 $ 195
Gross Amount Offset 0 0
Net Amount Presented 97 195
Gross Amounts Not Offset    
Derivatives 89 156
Financial Collateral 0 4
Net Amount 8 35
Derivative liabilities    
Gross Amount Recognized 352 262
Gross Amount Offset 0 0
Net Amount Presented 352 262
Gross Amounts Not Offset    
Derivatives 89 156
Financial Collateral 316 130
Net Amount $ (53) $ (24)
Period to collateralize 2 days