Employee Future Benefits - Key Assumptions Used to Determine Defined Benefit Obligation and Net Benefit Cost for Defined Benefit Pension Plans and Retiree Welfare Plans (Parenthetical) (Detail)	Dec. 31, 2024	Dec. 31, 2023
2041 \| Top of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate	9.00%
2041 \| Bottom of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate	4.80%
2035 \| Top of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate		7.80%
2035 \| Bottom of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate		4.80%
Retiree welfare plans \| 2041 \| Top of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate	8.80%	9.00%
Retiree welfare plans \| 2041 \| Bottom of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate	4.80%	4.80%
Retiree welfare plans \| 2029 \| Bottom of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate		4.00%
U.S. plans \| Pension plans \| Defined benefit obligation
Disclosure of defined benefit plans [line items]
Discount rate	5.50%	4.80%
U.S. plans \| Pension plans \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Discount rate	4.80%	5.00%
U.S. plans \| Retiree welfare plans \| Defined benefit obligation
Disclosure of defined benefit plans [line items]
Discount rate	5.40%	4.80%
Health care cost trend rate	8.80%	9.00%
U.S. plans \| Retiree welfare plans \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Discount rate	4.80%	5.00%
Health care cost trend rate	9.00%	7.80%
Canadian plans \| 2029 \| Bottom of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate	4.00%
Canadian plans \| 2023 \| Top of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate	5.10%	5.30%
Canadian plans \| 2024 \| Top of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate	3.90%
Canadian plans \| 2026 \| Bottom of range \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Health care cost trend rate		4.80%
Canadian plans \| Pension plans \| Defined benefit obligation
Disclosure of defined benefit plans [line items]
Discount rate	4.60%	4.60%
Canadian plans \| Pension plans \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Discount rate	4.60%	5.30%
Canadian plans \| Retiree welfare plans \| Defined benefit obligation
Disclosure of defined benefit plans [line items]
Discount rate	4.70%	4.70%
Health care cost trend rate	3.90%	3.90%
Canadian plans \| Retiree welfare plans \| Defined benefit cost
Disclosure of defined benefit plans [line items]
Discount rate	4.70%	5.30%
Health care cost trend rate	3.90%	5.30%
Canadian plans \| Retiree welfare plans \| 2029 \| Top of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate	3.90%
Canadian plans \| Retiree welfare plans \| 2029 \| Bottom of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate	4.00%
Canadian plans \| Retiree welfare plans \| 2023 \| Top of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate		5.10%
Canadian plans \| Retiree welfare plans \| 2024 \| Top of range
Disclosure of defined benefit plans [line items]
Health care cost trend rate		3.90%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

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Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

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