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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
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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%

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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