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Retirement and Post-Retirement Benefit Plans - Schedule of Funded Status of Defined Benefit and Post-Retirement Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Post-Retirement Benefit Plans      
Change in fair value of plan assets:      
Fair value of assets — beginning of year $ 351 $ 390  
Acquisition of plan 0 0  
Actual return on plan assets 76 26  
Employer contributions 4 9  
Participant contributions 59 53  
Benefits paid (102) (127)  
Settlement 0 0  
Currency impact 0 0  
Fair value of assets — end of year 388 351 $ 390
Change in benefits obligation      
Projected benefit obligation — beginning of year 463 535  
Acquisition of plan 0 0  
Service cost 1 1 1
Interest cost 15 18 20
Participant contributions 59 53  
Actuarial (gain) loss (39) (17)  
Benefits paid (102) (127)  
Plan amendments 0 0  
Settlement 0 0  
Currency impact 0 0  
Projected benefit obligation — end of year 397 463 535
Funded status at end of year (9) (112)  
Accumulated benefit obligation  
United States | Defined Benefit Plans      
Change in fair value of plan assets:      
Fair value of assets — beginning of year 10,838 10,176  
Acquisition of plan 0 0  
Actual return on plan assets (267) 1,223  
Employer contributions 33 33  
Participant contributions 0 0  
Benefits paid (575) (583)  
Settlement (11) (11)  
Currency impact 0 0  
Fair value of assets — end of year 10,018 10,838 10,176
Change in benefits obligation      
Projected benefit obligation — beginning of year 12,266 12,144  
Acquisition of plan 0 0  
Service cost 0 0 0
Interest cost 452 469 543
Participant contributions 0 0  
Actuarial (gain) loss (965) 247  
Benefits paid (575) (583)  
Plan amendments 0 0  
Settlement (11) (11)  
Currency impact 0 0  
Projected benefit obligation — end of year 11,167 12,266 12,144
Funded status at end of year (1,149) (1,428)  
Accumulated benefit obligation 11,167 12,266  
Non-U.S. | Defined Benefit Plans      
Change in fair value of plan assets:      
Fair value of assets — beginning of year 815 692  
Acquisition of plan 40 0  
Actual return on plan assets (2) 86  
Employer contributions 33 27  
Participant contributions 11 10  
Benefits paid (10) (14)  
Settlement (18) (6)  
Currency impact (19) 20  
Fair value of assets — end of year 850 815 692
Change in benefits obligation      
Projected benefit obligation — beginning of year 1,132 1,120  
Acquisition of plan 40 0  
Service cost 55 48 47
Interest cost 24 18 20
Participant contributions 11 10  
Actuarial (gain) loss 21 (77)  
Benefits paid (10) (14)  
Plan amendments 0 (3)  
Settlement (13) (6)  
Currency impact (33) 36  
Projected benefit obligation — end of year 1,227 1,132 $ 1,120
Funded status at end of year (377) (317)  
Accumulated benefit obligation $ 1,099 $ 1,014