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Post-employment benefit plans - Funded Status of Post-Employment Benefit Plans Cost (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | $ (2,374) | $ (1,657)
Plan asset (deficit) |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | (3,370) | (2,429)
Plan asset (deficit) | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (21,188) | (21,669)
Fair value of plan assets | 24,558 | 24,098
Plan surplus (deficit) | 3,370 | 2,429
Post-employment benefit asset (liability) | 2,374 | 1,657
Plan asset (deficit) | Funded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (19,558) | (20,004)
Fair value of plan assets | 24,123 | 23,703
Plan surplus (deficit) | 4,565 | 3,699
Post-employment benefit asset (liability) | 3,569 | 2,927
Plan asset (deficit) | Partially funded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (1,425) | (1,453)
Fair value of plan assets | 435 | 395
Plan surplus (deficit) | (990) | (1,058)
Post-employment benefit asset (liability) | (990) | (1,058)
Plan asset (deficit) | Unfunded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (205) | (212)
Fair value of plan assets | 0 | 0
Plan surplus (deficit) | (205) | (212)
Post-employment benefit asset (liability) | (205) | (212)
Effect of asset limit |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | 960 | 719
Effect of asset limit | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | (996) | (772)
Effect of asset limit | Funded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | (996) | (772)
Effect of asset limit | Partially funded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | 0 | 0
Effect of asset limit | Unfunded | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | $ 0 | $ 0

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- Definition Effect of Asset Limit + References No definition available. + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + 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 amount of deficit or 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/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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