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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Detail) | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of defined benefit plans [Line Items] |  |
Assumption for the consumer price index | 2.70% | 2.50%
Canada |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 4.60% | 4.60%
Long-term inflation | 2.00% | 1.90%
Rate of increase in pensions | 0.20% | 0.20%
UK |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 5.40% | 4.50%
Long-term inflation | 3.10% | 3.10%
Rate of increase in pensions | 2.70% | 2.60%
US |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 5.50% | 4.80%
Long-term inflation | 2.30% | 2.20%
Rate of increase in pensions | 0.00% | 0.00%
Switzerland |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 0.90% | 1.50%
Long-term inflation | 1.00% | 1.20%
Rate of increase in pensions | 2.20% | 2.30%

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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 The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; 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 The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; 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 Any other material assumption used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Actuarial assumptions [domain]; Defined benefit obligation, at present value] + 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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