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Pension and other postretirement benefits - Weighted average assumptions used in determining net periodic benefit cost (Detail) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.10% | 2.80% | 2.50%
Rate of return | 7.30% | 5.60% | 6.70%
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.10% | 2.70% | 2.30%
Initial healthcare trend rate | 6.10% | 6.40% | 6.80%
Ultimate healthcare trend rate | 4.50% | 4.50% | 4.50%

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- Definition Defined benefit plan, assumptions used calculating net periodic benefit cost, initial healthcare trend rate. + References No definition available. + Details
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- Definition Defined Benefit Plan, Net Periodic Benefit Cost, Ultimate Health Care Cost Trend Rate + 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 net periodic benefit cost 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 of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -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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- Details
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- Details
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