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Retirement and Post-Retirement Benefit Plans - Defined Benefit Plans (Narrative) (Details)
employee in Thousands, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2021
USD ($)
employee
Oct. 31, 2021
USD ($)
Oct. 31, 2022
USD ($)
Oct. 31, 2021
USD ($)
Oct. 31, 2020
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Settlement gain     $ 0 $ 37 $ (214)
Defined Benefit Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Settlement gain   $ 39      
United States | Defined Benefit Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Decrease in obligations $ 5,200        
Number of employees | employee 41        
Settlement gain     0 37 $ (217)
DPSP          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Fair value of plan assets   $ 482 $ 366 $ 482