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Retirement and Post-Retirement Benefit Plans - Lump sum program (Narrative) (Details)
plan_participant in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
plan_participant
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss   $ 7 $ 5 $ 179
Lump sum program        
Defined Benefit Plan Disclosure [Line Items]        
Number of plan participants elected to receive lump sum payments | plan_participant       16
Lump sum payments to participants       $ 977
Settlement loss $ 177