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Pensions and other postretirement benefit plans - Schedule of Assumptions Used to Determine Defined Benefit Plans Year-End Benefit Obligations (Details) | 12 Months Ended |  |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Weighted average discount rate |  |  | 5.05% | 2.95%
Pension benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Weighted average discount rate | 5.70% | 5.10% |  |
Rate of increase in future compensation levels | 2.00% | 2.00% |  |
Postretirement benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Weighted average discount rate | 5.80% | 5.40% |  |
Current year medical trend | 7.50% | 6.30% |  |
Ultimate year medical trend | 4.50% | 4.50% |  |
Year of ultimate trend | 2037 | 2031 |  |

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- Definition Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year 1 + References No definition available. + Details
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- Definition Defined Benefit Plan Ultimate Health Care Cost Trend Rate 2 + References No definition available. + Details
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- Definition Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 1 + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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