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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)

X

- 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
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-Publisher FASB
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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

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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

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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.

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