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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 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Post-Retirement Benefit Plans        
Retirement and post-retirement benefit plans        
Service cost $ 1 $ 1 $ 1 $ 1
Interest cost 2 2 4 5
Expected return on plan assets (6) (5) (12) (11)
Amortization and deferrals:        
Actuarial loss (gain) (4) (3) (8) (5)
Prior service benefit (3) (3) (6) (6)
Net periodic benefit (credit) cost (10) (8) (21) (16)
Settlement loss 0 0 0 0
Special termination benefit cost     0 44
Total periodic benefit (credit) cost (10) (8) (21) 28
U.S. | Defined Benefit Plans        
Retirement and post-retirement benefit plans        
Service cost 0 0 0 0
Interest cost 76 103 152 206
Expected return on plan assets (127) (175) (254) (350)
Amortization and deferrals:        
Actuarial loss (gain) 15 16 30 32
Prior service benefit 0 0 0 0
Net periodic benefit (credit) cost (36) (56) (72) (112)
Settlement loss 0 1 1 1
Special termination benefit cost     0 0
Total periodic benefit (credit) cost (36) (55) (71) (111)
Non-U.S. | Defined Benefit Plans        
Retirement and post-retirement benefit plans        
Service cost 17 15 34 31
Interest cost 4 4 9 9
Expected return on plan assets (12) (10) (24) (21)
Amortization and deferrals:        
Actuarial loss (gain) 14 11 27 21
Prior service benefit (1) 0 (1) (1)
Net periodic benefit (credit) cost 22 20 45 39
Settlement loss 0 0 0 0
Special termination benefit cost     0 0
Total periodic benefit (credit) cost $ 22 $ 20 $ 45 $ 39