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Employee Future Benefits - Additional Information (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of defined benefit plans [line items] |  |  |
Assets set aside for plan |  | $ 0 |
Pension plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024 | $ 64 |  |
Defined contribution plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024 | 102 |  |
Retiree welfare plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024 | $ 18 |  |
Canadian plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024 |  | $ 2 |
Return-Seeking Assets |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Target asset allocation for plan |  | 30.00% | 30.00%
Return-Seeking Assets | Canada |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Target asset allocation for plan |  | 17.00% | 17.00%
Liability-Hedging Assets |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Target asset allocation for plan |  | 70.00% | 70.00%
Liability-Hedging Assets | Canada |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Target asset allocation for plan |  | 83.00% | 83.00%

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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 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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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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