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Employee Benefits -Summary of Key Weighted-Average Assumptions used by Bank for Measurement of Benefit Obligation and Benefit Expense for All of Bank's Principal Plans (Detail) | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Pension plans [member] | Canada [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.6 | 23.6
Pension plans [member] | Canada [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.7 | 24.7
Pension plans [member] | Canada [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.5 | 24.5
Pension plans [member] | Canada [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 25.6 | 25.6
Pension plans [member] | Mexico [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 21.6 | 21.6
Pension plans [member] | Mexico [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24 | 24
Pension plans [member] | Mexico [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 21.7 | 21.7
Pension plans [member] | Mexico [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24 | 24
Pension plans [member] | United States [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 22.1 | 22
Pension plans [member] | United States [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.5 | 23.5
Pension plans [member] | United States [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.5 | 23.4
Pension plans [member] | United States [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.9 | 24.8
Pension plans [member] | Actuarial assumption of discount rates for all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 5.17% | 5.22%
Pension plans [member] | Actuarial assumption of discount rates for canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.80% | 4.80%
Pension plans [member] | Actuarial assumption of discount rates [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | [1] | 3.85% | 3.85%
Rate of increase in future compensation | [1] | 3.85% | 3.96%
Pension plans [member] | Actuarial assumption of discount rates for defined benefit obligations of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 5.22% | 6.13%
Pension plans [member] | Actuarial assumption of discount rates for net interest cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.96% | 6.13%
Pension plans [member] | Actuarial assumption of discount rates for service cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 5.28% | 6.06%
Pension plans [member] | Actuarial assumption of discount rates for interest on service cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 5.10% | 6.07%
Pension plans [member] | Actuarial assumption of discount rates for defined benefit obligations of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.80% | 5.70%
Pension plans [member] | Actuarial assumption of discount rates for net interest cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.51% | 5.70%
Pension plans [member] | Actuarial assumption of discount rates for service cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.90% | 5.60%
Pension plans [member] | Actuarial assumption of discount rates for interest on service cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.70% | 5.61%
Other benefit plans [member] | Canada [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.6 | 23.6
Other benefit plans [member] | Canada [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.7 | 24.7
Other benefit plans [member] | Canada [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.5 | 24.5
Other benefit plans [member] | Canada [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 25.6 | 25.6
Other benefit plans [member] | Mexico [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 21.6 | 21.6
Other benefit plans [member] | Mexico [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24 | 24
Other benefit plans [member] | Mexico [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 21.7 | 21.7
Other benefit plans [member] | Mexico [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24 | 24
Other benefit plans [member] | United States [member] | Retiring currently at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 22.1 | 22
Other benefit plans [member] | United States [member] | Retiring currently at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.5 | 23.5
Other benefit plans [member] | United States [member] | Currently aged 45 and retiring at age 65 [member] | Male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 23.5 | 23.4
Other benefit plans [member] | United States [member] | Currently aged 45 and retiring at age 65 [member] | Female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy for members |  | 24.9 | 24.8
Other benefit plans [member] | Actuarial assumption of discount rates for all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 6.34% | 6.51%
Other benefit plans [member] | Actuarial assumption of discount rates for canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.49% | 4.69%
Other benefit plans [member] | Actuarial assumption of discount rates [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | [1] | 4.48% | 4.37%
Rate of increase in future compensation | [1] | 4.37% | 4.61%
Other benefit plans [member] | Actuarial assumption of discount rates for defined benefit obligations of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 6.51% | 7.36%
Other benefit plans [member] | Actuarial assumption of discount rates for net interest cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 6.35% | 7.36%
Other benefit plans [member] | Actuarial assumption of discount rates for service cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 6.62% | 7.31%
Other benefit plans [member] | Actuarial assumption of discount rates for interest on service cost of all plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 6.53% | 7.27%
Other benefit plans [member] | Actuarial assumption of discount rates for defined benefit obligations of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.69% | 5.80%
Other benefit plans [member] | Actuarial assumption of discount rates for net interest cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.42% | 5.80%
Other benefit plans [member] | Actuarial assumption of discount rates for service cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.87% | 5.62%
Other benefit plans [member] | Actuarial assumption of discount rates for interest on service cost of canadian plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate |  | 4.69% | 5.53%
Other benefit plans [member] | Actuarial assumption of medical cost trend initial rates [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Health care cost trend rates at end of year |  | 5.62% | 5.72%
Other benefit plans [member] | Actuarial assumption of medical cost trend ultimate rates [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Health care cost trend rates at end of year |  | 4.76% | 4.71%
Year ultimate rate reached |  | 2041 | 2041
[1] | The weighted-average rates of increase in future compensation shown for other benefit plans do not include Canadian flexible post-retirement benefits plans established in fiscal 2005, as they are not impacted by future compensation increases.

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