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Employee Benefits - Summary of Sensitivity Analysis of Key Assumptions (Detail) $ in Millions | Oct. 31, 2025 CAD ($)
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Pension plans [member] | 1% Actuarial Assumption of Discount Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Decrease in assumption | $ 1,382
Decrease in assumption | 88
Pension plans [member] | 0.25% Actuarial Assumption of Expected Rates of Salary Increases [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 73
Increase in assumption | 5
Pension plans [member] | Canada [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 160
Increase in assumption | 10
Pension plans [member] | Mexico [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 3
Pension plans [member] | United States [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 2
Other benefit plans [member] | 1% Actuarial Assumption of Discount Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Decrease in assumption | 124
Decrease in assumption | 5
Other benefit plans [member] | 1% Actuarial Assumption of Medical Cost Trend Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 97
Decrease in assumption | (81)
Increase in assumption | 13
Decrease in assumption | (10)
Other benefit plans [member] | Canada [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 18
Increase in assumption | 1
Other benefit plans [member] | Mexico [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | 3
Other benefit plans [member] | United States [member] | 1 Year Actuarial Assumption of Life Expectancy Rates [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase in assumption | $ 1

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- Definition Increase (decrease) in defined benefit expense due to reasonably possible decrease in actuarial assumption. + References No definition available. + Details
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- Definition Increase (decrease) in defined benefit expense due to reasonably possible increase in actuarial assumption. + References No definition available. + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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