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Employee Compensation - Pension and Other Employee Future Benefits - Summary of Weighted-average Assumptions (Parenthetical) (Detail)
Oct. 31, 2025
Oct. 31, 2024
Pension Plans [member] | Current service costs [member]    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates 4.90% 5.60%
Pension Plans [member] | Defined Benefit Expenses [Member]    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates [1],[2] 4.90% 5.80%
Pension Plans [member] | Defined Benefit Obligation [Member]    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates 4.80% 4.90%
Other employee future benefit plans [member] | Current service costs [member]    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates 5.00% 5.70%
Other employee future benefit plans [member] | Defined Benefit Expenses [Member]    
Disclosure of defined benefit plans [line items]    
Assumed overall health care cost trend rate [3] 4.80% 4.80%
Actuarial assumption of discount rates [1],[2] 4.80% 5.70%
Other employee future benefit plans [member] | Defined Benefit Expenses [Member] | 2041 [Member]    
Disclosure of defined benefit plans [line items]    
Assumed overall health care cost trend rate 4.00% 4.00%
Other employee future benefit plans [member] | Defined Benefit Obligation [Member]    
Disclosure of defined benefit plans [line items]    
Assumed overall health care cost trend rate [3] 4.70% 4.80%
Actuarial assumption of discount rates 4.70% 4.80%
Other employee future benefit plans [member] | Defined Benefit Obligation [Member] | 2041 [Member]    
Disclosure of defined benefit plans [line items]    
Assumed overall health care cost trend rate 4.00%  
[1] The other employee future benefit plans current service cost was calculated using a separate discount rate of 5.0% and 5.7% for 2025 and 2024, respectively.
[2] The pension benefit current service cost was calculated using a separate discount rate of 4.9% and 5.6% for 2025 and 2024, respectively.
[3] Trending to 4.0% in 2041 and remaining at that level thereafter.