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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
	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

X

- Definition

Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year 1

+ References

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- Definition

Defined Benefit Plan Ultimate Health Care Cost Trend Rate 2

+ References

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- Definition

Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 1

+ References

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X

- 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

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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

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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

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- Details

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