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Retirement and Post-Retirement Benefit Plans - Schedule of Pension and Post-Retirement Benefit (Credit) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Post-Retirement Benefit Plans    
Retirement and post-retirement benefit plans    
Service cost $ 0 $ 0
Interest cost 4 4
Expected return on plan assets (5) (6)
Amortization and deferrals:    
Actuarial loss (gain) (8) (4)
Prior service benefit (3) (5)
Net periodic (credit) benefit cost (12) (11)
Settlement loss 0 0
Total periodic benefit (credit) cost (12) (11)
U.S. | Defined Benefit Plans    
Retirement and post-retirement benefit plans    
Service cost 0 0
Interest cost 123 113
Expected return on plan assets (145) (181)
Amortization and deferrals:    
Actuarial loss (gain) 15 15
Prior service benefit 0 0
Net periodic (credit) benefit cost (7) (53)
Settlement loss 0 1
Total periodic benefit (credit) cost (7) (52)
Non-U.S. | Defined Benefit Plans    
Retirement and post-retirement benefit plans    
Service cost 14 14
Interest cost 6 6
Expected return on plan assets (10) (10)
Amortization and deferrals:    
Actuarial loss (gain) 8 7
Prior service benefit (1) (1)
Net periodic (credit) benefit cost 17 16
Settlement loss 0 0
Total periodic benefit (credit) cost $ 17 $ 16