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Employee Future Benefits - Life Expectancies (Detail) - yr | Dec. 31, 2024 | Dec. 31, 2023
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U.S. | Life expectancy (in years) for those currently age 65 | Males |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 22,200,000 | 22,200,000
U.S. | Life expectancy (in years) for those currently age 65 | Females |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 23,700,000 | 23,700,000
U.S. | Life expectancy (in years) at age 65 for those currently age 45 | Males |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 23,600,000 | 23,600,000
U.S. | Life expectancy (in years) at age 65 for those currently age 45 | Females |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 25,100,000 | 25,000,000.0
Canada | Life expectancy (in years) for those currently age 65 | Males |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 24,400,000 | 24,300,000
Canada | Life expectancy (in years) for those currently age 65 | Females |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 26,200,000 | 26,200,000
Canada | Life expectancy (in years) at age 65 for those currently age 45 | Males |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 25,300,000 | 25,300,000
Canada | Life expectancy (in years) at age 65 for those currently age 45 | Females |  |
Disclosure of defined benefit plans [line items] |  |
Life expectancy (in years) | 27,100,000 | 27,100,000

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