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Employee Future Benefits - Amounts Recognized in Consolidated Statements of Financial Position (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | $ 3,826 | $ 3,789
Fair value of plan assets | 3,820 | 3,706
Deficit (surplus) | 6 | 83
Effect of asset limit | 44 | 41
Deficit (surplus) and net defined benefit liability (asset) | 50 | 124
Pension plans | Funded or partially funded plans |  |
Disclosure of defined benefit plans [line items] |  |
Deficit (surplus) and net defined benefit liability (asset) | (483) | (422)
Pension plans | Unfunded plans |  |
Disclosure of defined benefit plans [line items] |  |
Deficit (surplus) and net defined benefit liability (asset) | 533 | 546
Retiree welfare plans |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 428 | 450
Fair value of plan assets | 553 | 526
Deficit (surplus) | (125) | (76)
Effect of asset limit | 0 | 0
Deficit (surplus) and net defined benefit liability (asset) | (125) | (76)
Retiree welfare plans | Funded or partially funded plans |  |
Disclosure of defined benefit plans [line items] |  |
Deficit (surplus) and net defined benefit liability (asset) | (221) | (190)
Retiree welfare plans | Unfunded plans |  |
Disclosure of defined benefit plans [line items] |  |
Deficit (surplus) and net defined benefit liability (asset) | $ 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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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2024-03-27 + 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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- Details
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- Details
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