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Financial Instruments - Offsetting Assets and Liabilities (Details)
$ in Millions
Oct. 31, 2021
USD ($)
businessDay
Oct. 31, 2020
USD ($)
Derivative assets    
Gross Amount Recognized $ 407 $ 510
Gross Amount Offset 0 0
Net Amount Presented 407 510
Gross Amounts Not Offset    
Derivatives 123 137
Financial Collateral 173 321
Net Amount 111 52
Derivative liabilities    
Gross Amount Recognized 127 194
Gross Amount Offset 0 0
Net Amount Presented 127 194
Gross Amounts Not Offset    
Derivatives 123 137
Financial Collateral 5 55
Net Amount $ (1) 2
Business days prior to respective reporting date | businessDay 2  
Cash collateral posted $ 5  
Counterparty collateral   $ 55