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Employee Future Benefits - Summary of Cash Payments (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Pension defined benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | $ 152 | $ 144
Retiree welfare plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 12 | 11
Defined benefit plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 59 | 59
Defined benefit plans [Member] | Retiree welfare plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 12 | 11
Defined contribution plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 93 | 85
Defined contribution plans [Member] | Retiree welfare plans [member] |  |
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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
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- Details
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Data Type: | na
Balance Type: |
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- Details
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Balance Type: |
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