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Employee Future Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 3,794 | $ 4,560
Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 466 | 584
U.S. plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 2,515 | 2,908
U.S. plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 509 | 537
U.S. plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 2,006 | 2,371
U.S. plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 355 | 433
U.S. plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 11 | 17
U.S. plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 344 | 416
Canadian plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,279 | 1,652
Canadian plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 125 | 184
Canadian plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,154 | 1,468
Canadian plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 111 | 151
Canadian plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 0 |
Canadian plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 111 | $ 151

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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 2022-03-24 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | credit
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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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