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Retirement and Post-Retirement Benefit Plans - Pension and Post-Retirement Benefit Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Amortization and deferrals:      
Settlement loss $ 7 $ 5 $ 179
Post-Retirement Benefit Plans      
Net benefit (credit) cost      
Service cost 1 1 1
Interest cost 15 18 20
Expected return on plan assets (23) (26) (33)
Amortization and deferrals:      
Actuarial loss (gain) (17) (17) (12)
Prior service credit (18) (19) (17)
Net periodic (credit) benefit cost (42) (43) (41)
Curtailment gain 0 0
Settlement loss 0 0 0
Special termination benefits 0 0 4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (42) (43) (37)
U.S. | Defined Benefit Plans      
Net benefit (credit) cost      
Service cost 0 0 0
Interest cost 452 469 543
Expected return on plan assets (717) (677) (732)
Amortization and deferrals:      
Actuarial loss (gain) 58 73 55
Prior service credit 0 0 0
Net periodic (credit) benefit cost (207) (135) (134)
Curtailment gain 0 0 0
Settlement loss 2 3 180
Special termination benefits 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (205) (132) 46
Non-U.S. | Defined Benefit Plans      
Net benefit (credit) cost      
Service cost 55 48 47
Interest cost 24 18 20
Expected return on plan assets (39) (31) (36)
Amortization and deferrals:      
Actuarial loss (gain) 28 40 28
Prior service credit (3) (3) (3)
Net periodic (credit) benefit cost 65 72 56
Curtailment gain 0 0 (1)
Settlement loss 5 2 3
Special termination benefits 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 70 $ 74 $ 58