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Financial Instruments - Pre-tax Effect of Derivative Instruments in Hedging Relationships on OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Derivative Instruments, Gain (Loss)      
Net unrealized gains (losses) arising during the period $ (50) $ (40) $ 308
Total (83) 16 310
Foreign exchange contracts      
Derivative Instruments, Gain (Loss)      
Net unrealized gains (losses) arising during the period (50) (34) 307
Gains (Losses) Recognized in OCI on Derivatives in Net Investment Hedging Relationship (33) 56 2
Interest rate contracts      
Derivative Instruments, Gain (Loss)      
Net unrealized gains (losses) arising during the period $ 0 $ (6) $ 1