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Financial Instruments - Amounts Recorded in the Balance Sheet (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Notes payable and short-term borrowings    
Derivatives, Fair Value    
Carrying amount of the hedged assets/ (liabilities) $ (2,992) $ (2,987)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets 6 11
Long-term debt    
Derivatives, Fair Value    
Carrying amount of the hedged assets/ (liabilities) (3,933) (3,908)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged (liabilities) $ (96) $ (72)