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Employee Future Benefits - Summary of Life Expectancies Underlying Values of Obligations in Defined Benefit Pension and Retiree Welfare Plans (Detail) | Dec. 31, 2020 yr
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U.S. [member] | Life expectancy (in years) for those currently age 65 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 21.9
U.S. [member] | Life expectancy (in years) for those currently age 65 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 23.4
U.S. [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 23.3
U.S. [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 24.8
Canada [member] | Life expectancy (in years) for those currently age 65 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 23.8
Canada [member] | Life expectancy (in years) for those currently age 65 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 25.6
Canada [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 24.7
Canada [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 26.5

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