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v3.25.0.1

Pensions and Other Post-Employment Benefits - Additional Information (Detail) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Future Salary Growth Rate |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption |  | 1.00% |
Percentage of reasonably possible increase in actuarial assumption |  | 1.00% |
Increase |  | $ 0 |
Health Care Cost Trend Rate |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption |  | 1.00% |
Percentage of reasonably possible increase in actuarial assumption |  | 1.00% |
Increase |  | $ 0 |
One Year Change in Assumed Life Expectancy |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Reasonably possible increase in actuarial assumption, life expectancy |  | 1 year |
Reasonably possible decrease in actuarial assumption, life expectancy |  | 1 year |
Increase |  | $ 0 |
Actuarial assumption of discount rates |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption |  | 1.00% |
Percentage of reasonably possible increase in actuarial assumption |  | 1.00% |
Increase |  | $ (56,000,000) | $ (54,000,000)
DB Pension Plan |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration |  | 16 years |
Percentage of employees contribution under pension plan |  | 4.00% |
Employer contribution |  | $ 12,000,000 |
OPEB Plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration |  | 14 years |
OPEB Plans | Forecast |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 12,000,000 |  |

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- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2024-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
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