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Employee Future Benefits - Disaggregation of Defined Benefit Obligation (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Pension plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | $ 3,826 | $ 3,789
Retiree welfare plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 428 | 450
U.S. plans | Pension plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 2,500 | 2,433
U.S. plans | Pension plans | Active members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 578 | 526
U.S. plans | Pension plans | Inactive and retired members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 1,922 | 1,907
U.S. plans | Retiree welfare plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 332 | 336
U.S. plans | Retiree welfare plans | Active members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 8 | 9
U.S. plans | Retiree welfare plans | Inactive and retired members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 324 | 327
Canadian plans | Pension plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 1,326 | 1,356
Canadian plans | Pension plans | Active members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 106 | 116
Canadian plans | Pension plans | Inactive and retired members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 1,220 | 1,240
Canadian plans | Retiree welfare plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 96 | 114
Canadian plans | Retiree welfare plans | Active members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 0 | 0
Canadian plans | Retiree welfare plans | Inactive and retired members |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | $ 96 | $ 114

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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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- Details
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- Details
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- Details
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