Employee Benefits - Summary of Sensitivity Analysis of Key Assumptions (Detail) $ in Millions	Oct. 31, 2025 CAD ($)
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

Increase (decrease) in defined benefit expense due to reasonably possible decrease in actuarial assumption.

No definition available.

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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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ 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

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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

+ Details

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