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Pension and other post-retirement benefits - Weighted Average Assumptions Used to Determine Net Benefit Obligation (Detail)	12 Months Ended
	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

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- Definition

Defined Benefit Plan, Benefit Obligation Ultimate Health Care Cost Inflation Rate

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- Definition

Defined Benefit Plan, Benefit Obligation, Year that Rate Reaches Ultimate Trend Rate

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- Definition

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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

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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

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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.

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