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Post-employment benefit plans - Funded Status of Post-Employment Benefit Plans Cost (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | $ (1,657) | $ (2,248)
Plan asset (deficit) |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | (2,429) | (3,249)
Plan asset (deficit) | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (21,669) | (20,433)
Fair value of plan assets | 24,098 | 23,682
Plan surplus (deficit) | 2,429 | 3,249
Post-employment benefit asset (liability) | 1,657 | 2,248
Plan asset (deficit) | FUNDED | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (20,004) | (18,741)
Fair value of plan assets | 23,703 | 23,291
Plan surplus (deficit) | 3,699 | 4,550
Post-employment benefit asset (liability) | 2,927 | 3,549
Plan asset (deficit) | PARTIALLY FUNDED | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (1,453) | (1,461)
Fair value of plan assets | 395 | 391
Plan surplus (deficit) | (1,058) | (1,070)
Post-employment benefit asset (liability) | (1,058) | (1,070)
Plan asset (deficit) | UNFUNDED | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Present value of post-employment benefit obligations | (212) | (231)
Fair value of plan assets | 0 | 0
Plan surplus (deficit) | (212) | (231)
Post-employment benefit asset (liability) | (212) | (231)
Effect of asset limit |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefit asset (liability) | 719 | 980
Effect of asset limit | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | (772) | (1,001)
Effect of asset limit | FUNDED | Defined Benefit Plan and OPEB |  |
Disclosure of defined benefit plans [line items] |  |
Effect of asset limit | (772) | (1,001)
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 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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