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Retirement and Post-Retirement Benefit Plans - Narrative (Details)
$ in Millions
6 Months Ended
Apr. 30, 2021
USD ($)
Post-Retirement Benefit Plans  
Retirement and post-retirement benefit plans  
Anticipated contributions $ 5
Contributions to benefit plans 2
Non-U.S. | Defined Benefit Plans  
Retirement and post-retirement benefit plans  
Anticipated contributions 77
Contributions to benefit plans 43
U.S. | Non-qualified plan  
Retirement and post-retirement benefit plans  
Anticipated contributions 34
Contributions to benefit plans $ 15