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Employee Future Benefits - Weighted Average Duration of the Defined Benefit Obligations (Detail) - yr | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension plans | U.S. plans |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration (in years) of the defined benefit obligations | 8.0 | 8.4
Pension plans | Canadian plans |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration (in years) of the defined benefit obligations | 10.1 | 9.9
Retiree welfare plans | U.S. plans |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration (in years) of the defined benefit obligations | 7.7 | 8.2
Retiree welfare plans | Canadian plans |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration (in years) of the defined benefit obligations | 10.9 | 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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- Details
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- Details
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- Details
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