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Retirement Benefit Plans (Details) - Benefit Plans - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 23 $ 21
Interest cost 36 55
Expected return on plan assets (135) (130)
Amortization and deferrals:    
Actuarial loss 64 57
Prior service benefit (3) (4)
Net periodic benefit credit (15) (1)
Settlement loss 0 5
Net benefit (credit) cost $ (15) $ 4