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Employee Future Benefits - Potential Impact on Obligations Arising From Changes in Key Assumptions (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
U.S. |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in mortality rate | 10.00% |
U.S. | Males |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days |
U.S. | Females |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days |
Discount rate | Pension plans |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Impact of increase in actuarial assumption | $ (260) | $ (274)
Impact of decrease in actuarial assumption | 305 | 316
Discount rate | Retiree welfare plans |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Impact of increase in actuarial assumption | (34) | (38)
Impact of decrease in actuarial assumption | 40 | 44
Health care cost trend rate | Retiree welfare plans |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Impact of increase in actuarial assumption | 9 | 11
Impact of decrease in actuarial assumption | (8) | (10)
Mortality rates | Pension plans |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Impact of decrease in actuarial assumption | 89 | 89
Mortality rates | Retiree welfare plans |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Impact of decrease in actuarial assumption | $ 9 | $ 6

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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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- Definition Actuarial assumptions increase in life expectancy at age sixty five due to ten percent decrease in mortality rate. + References No definition available. + Details
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- Definition Decrease In Mortality Rate + References No definition available. + Details
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