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Pension and other postretirement benefits - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded (unfunded) status of plan | $ (95) | $ (105) |
Benefit obligation | 95 | 105 | $ 100
Employer contributions | 6 |  |
United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded (unfunded) status of plan | (30) | (47) |
Benefit obligation | 464 | 496 | 497
Employer contributions | 2 |  |
Non-U.S. | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | 8 | 11 |
Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded (unfunded) status of plan | 180 | 110 |
Benefit obligation | 2,283 | 2,414 | $ 2,105
Employer contributions | $ 36 |  |
Equity instruments | Minimum | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 10.00% |  |
Equity instruments | Minimum | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 10.00% |  |
Equity instruments | Minimum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 15.00% |  |
Equity instruments | Minimum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 10.00% |  |
Equity instruments | Minimum | Switzerland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 25.00% |  |
Equity instruments | Maximum | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 30.00% |  |
Equity instruments | Maximum | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 30.00% |  |
Equity instruments | Maximum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 25.00% |  |
Equity instruments | Maximum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 20.00% |  |
Equity instruments | Maximum | Switzerland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 35.00% |  |
Debt instrument | Minimum | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 65.00% |  |
Debt instrument | Minimum | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 65.00% |  |
Debt instrument | Minimum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 25.00% |  |
Debt instrument | Minimum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 55.00% |  |
Debt instrument | Minimum | Switzerland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 25.00% |  |
Debt instrument | Maximum | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 85.00% |  |
Debt instrument | Maximum | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 85.00% |  |
Debt instrument | Maximum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 40.00% |  |
Debt instrument | Maximum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 65.00% |  |
Debt instrument | Maximum | Switzerland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 55.00% |  |
Real estate | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 0.00% |  |
Real estate | Minimum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 5.00% |  |
Real estate | Maximum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 10.00% |  |
Defined benefit plan, funded plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded (unfunded) status of plan | $ 290 | 218 |
Defined benefit plan, unfunded plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded (unfunded) status of plan | $ (235) | $ (260) |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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