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Financial Instruments - Amounts Recorded in the Balance Sheet (Details) - Long-term debt - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Derivatives, Fair Value    
Carrying amount of the hedged assets/ (liabilities) $ (3,990) $ (4,059)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged (liabilities) $ (150) $ (220)