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Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Obligation (Detail) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 5.19% | 5.48%
Interest crediting rate (for cash balance plans) | 4.48% | 4.50%
Rate of compensation increase | 3.60% | 3.70%
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 5.22% | 5.49%
Health care cost trend rate |  |
Before age 65 | 7.00% | 6.00%
Age 65 and after | 6.00% | 6.00%
Assumed ultimate medical inflation rate | 4.50% | 4.75%
Year in which ultimate rate is reached | 2034 | 2033

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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Interest Crediting Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Benefit Obligation Ultimate Health Care Cost Inflation Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Benefit Obligation, Year that Rate Reaches Ultimate Trend Rate + References No definition available. + Details
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- Definition Defined Benefit Plan Health Care Cost Trend Rate Assumed For Calculating Benefit Obligation in Next Fiscal Year Post Sixty Five + 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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