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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Derivative assets    
Gross Amount Recognized $ 496 $ 468
Gross Amount Offset 0 0
Net Amount Presented 496 468
Gross Amounts Not Offset    
Derivatives 118 123
Financial Collateral 349 263
Net Amount 29 82
Derivative liabilities    
Gross Amount Recognized 130 147
Gross Amount Offset 0 0
Net Amount Presented 130 147
Gross Amounts Not Offset    
Derivatives 118 123
Financial Collateral 6 19
Net Amount $ 6 5
Business days prior to reporting date 2 days  
Cash collateral $ 6  
Counterparty collateral   $ 19