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Retirement and Post-Retirement Benefit Plans - Funded Status of Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Defined Benefit Plans      
Change in fair value of plan assets:      
Fair value—beginning of year $ 14,127 $ 13,434  
Addition/deletion of plans 60 5  
Actual return on plan assets 1,256 557  
Employer contributions 167 167  
Participant contributions 23 24  
Benefits paid (486) (410)  
Settlement (32) (51)  
Currency impact 239 401  
Fair value—end of year 15,354 14,127 $ 13,434
Change in benefit obligation:      
Projected benefit obligation—beginning of year 14,845 14,225  
Addition/deletion of plans 68 5  
Service cost 97 94 85
Interest cost 118 143 215
Participant contributions 23 24  
Actuarial loss (gain) 13 368  
Benefits paid (486) (410)  
Plan amendments 0 (3)  
Curtailment (5) 0  
Settlement (32) (51)  
Special termination benefits 3 2  
Currency impact 228 448  
Projected benefit obligation—end of year 14,872 14,845 14,225
Funded status at end of year 482 (718)  
Accumulated benefit obligation 14,668 14,619  
Post-Retirement Benefit Plans      
Change in fair value of plan assets:      
Fair value—beginning of year 57 54  
Addition/deletion of plans 0 0  
Actual return on plan assets 2 0  
Employer contributions 5 5  
Participant contributions 5 5  
Benefits paid (9) (7)  
Settlement 0 0  
Currency impact 0 0  
Fair value—end of year 60 57 54
Change in benefit obligation:      
Projected benefit obligation—beginning of year 167 179  
Addition/deletion of plans 0 0  
Service cost 1 1 1
Interest cost 4 5 7
Participant contributions 5 5  
Actuarial loss (gain) (10) (9)  
Benefits paid (9) (7)  
Plan amendments 0 0  
Curtailment 0 0  
Settlement 0 0  
Special termination benefits 0 0  
Currency impact 3 (7)  
Projected benefit obligation—end of year 161 167 $ 179
Funded status at end of year (101) (110)  
Accumulated benefit obligation $ 0 $ 0