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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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- 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 + Details
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