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Pension and other post-retirement benefits - Weighted-average assumptions (Details 5) - International - Defined benefit pension plans	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		100.00%	100.00%
Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	100.00%
Cash and cash equivalents
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		11.40%	5.10%
Cash and cash equivalents | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	1.50%
Debt securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		82.50%	89.40%
Debt securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	91.40%
Equity securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		3.20%	4.50%
Equity securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.70%
Alternative investments
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		0.50%	2.50%
Insurance
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		3.40%	3.50%
Insurance | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.40%

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- References

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- References

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- Definition

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+ References

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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