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Employee Future Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 3,789 | $ 3,794
Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 450 | 466
U.S. plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 2,433 | 2,515
U.S. plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 526 | 509
U.S. plans [Member] | Pension defined benefit plans [member] | Inactive and retired [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,907 | 2,006
U.S. plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 336 | 355
U.S. plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 9 | 11
U.S. plans [Member] | Retiree welfare plans [Member] | Inactive and retired [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 327 | 344
Canadian plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,356 | 1,279
Canadian plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 116 | 125
Canadian plans [Member] | Pension defined benefit plans [member] | Inactive and retired [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,240 | 1,154
Canadian plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 114 | 111
Canadian plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 0 | 0
Canadian plans [Member] | Retiree welfare plans [Member] | Inactive and retired [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 114 | $ 111

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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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Balance Type: | credit
Period Type: | instant

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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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- Details
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- Details
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