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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, 2025 | Dec. 31, 2024
Pension benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Weighted average discount rate | 5.50% | 5.70%
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 | 5.40% | 5.80%
Current year medical trend | 7.30% | 7.50%
Ultimate year medical trend | 4.50% | 4.50%
Year of ultimate trend | 2037 | 2037

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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 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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 5 -Subparagraph (j)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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- Details
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- Details
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