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Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2022
U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Decrease in mortality rates | 10.00%
Male [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Male [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 8 months 12 days
Female [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Female [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days

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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 Actuarial assumptions increase in life expectancy at age sixty five due to ten percent decrease in mortality rate. + References No definition available. + Details
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- Definition Decrease in mortality rate. + References No definition available. + Details
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