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v3.20.4

Employee Future Benefits - Summary of Weighted Average Duration of the Defined Benefit Obligations (Detail) - yr | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
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 | 9.9 | 9.3
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 | 12.5 | 12.3
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 | 9.8 | 9.7
Retiree welfare plans [Member] | Canadian plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weighted average duration (in years) of the defined benefit obligations | 14.7 | 14.3

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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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