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Employee Future Benefits - Summary of Weighted Average Duration of the Defined Benefit Obligations (Detail) - yr | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Pension defined benefit plans [member] | U.S. plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weighted average duration (in years) of the defined benefit obligations | 8.4 | 8.2
Pension defined benefit plans [member] | Canadian plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weighted average duration (in years) of the defined benefit obligations | 9.9 | 10.6
Retiree welfare plans [Member] | U.S. plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weighted average duration (in years) of the defined benefit obligations | 8.2 | 8.2
Retiree welfare plans [Member] | Canadian plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weighted average duration (in years) of the defined benefit obligations | 11.1 | 11.1

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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 Weighted average of defined benefit obligations. + 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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