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Employee Future Benefits - Cash Payments (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | $ 154 | $ 152
Retiree welfare plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 12 | 12
Defined benefit plans | Pension plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 57 | 59
Defined benefit plans | Retiree welfare plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 12 | 12
Defined contribution plans | Pension plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 97 | 93
Defined contribution plans | Retiree welfare plans |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | $ 0 | $ 0

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&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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- Details
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