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Retirement and Post-Retirement Benefit Plans - Summary of Net Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Defined Benefit Plans      
Net benefit (credit) cost      
Service cost $ 97 $ 94 $ 85
Interest cost 118 143 215
Expected return on plan assets (479) (544) (511)
Amortization and deferrals:      
Actuarial loss (gain) 296 264 235
Prior service benefit (13) (14) (15)
Net periodic benefit cost 19 (57) 9
Settlement loss 4 10 13
Special termination benefits 3 2 2
Total net benefit cost (credit) 26 (45) 24
Post-Retirement Benefit Plans      
Net benefit (credit) cost      
Service cost 1 1 1
Interest cost 4 5 7
Expected return on plan assets (1) (1) (1)
Amortization and deferrals:      
Actuarial loss (gain) (2) (1) (4)
Prior service benefit 0 0 0
Net periodic benefit cost 2 4 3
Settlement loss 0 0 0
Special termination benefits 0 0 0
Total net benefit cost (credit) $ 2 $ 4 $ 3