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Retirement and Post-Retirement Benefit Plans - Pre-Tax Net Actuarial Loss and Prior Service Benefit Recognized in Accumulated Other Comprehensive Loss for the Defined Benefit Plans (Details)
$ in Millions
Oct. 31, 2021
USD ($)
Defined Benefit Plans  
Defined Benefit Plan, Plan Assets, Allocation [Line Items]  
Net actuarial loss (gain) $ 2,575
Prior service benefit (14)
Total recognized in accumulated other comprehensive loss 2,561
Post-Retirement Benefit Plans  
Defined Benefit Plan, Plan Assets, Allocation [Line Items]  
Net actuarial loss (gain) (2)
Prior service benefit 0
Total recognized in accumulated other comprehensive loss $ (2)