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Pension and other postretirement benefits - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded status | $ 105 | $ 100 |
Benefit obligation | 105 | 100 | $ 129
United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded status | 47 | 51 |
Benefit obligation | 496 | 497 | 677
Non-U.S. | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | 11 | 11 |
Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded status | (110) | (211) |
Benefit obligation | $ 2,414 | 2,105 | $ 3,136
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 | 20.00% |  |
Debt instrument | Minimum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 45.00% |  |
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 | 35.00% |  |
Debt instrument | Maximum | Republic of Ireland |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 55.00% |  |
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% |  |
Other | United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 0.00% |  |
Other | Minimum | Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation ranges | 0.00% |  |
Other | 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 status | $ (218) | (298) |
Defined Benefit Plan, Unfunded Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded status | $ 260 | $ 238 |

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