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Pension and other postretirement benefits - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 434	$ 449	$ 446
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,463	2,524	2,316
Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19	14
Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,966	2,017
Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	413	431
Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	376	368
Level 3 | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	4	19
Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	4
Level 3 | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121	139	132
Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121	139
Cash and cash equivalents | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3	3
Target allocation ranges	0.00%
Cash and cash equivalents | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 54	65
Cash and cash equivalents | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Cash and cash equivalents | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Cash and cash equivalents | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3	3
Cash and cash equivalents | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	50
Cash and cash equivalents | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22	15
Cash and cash equivalents | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Equity instruments | United States | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
Equity instruments | United States | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Equity instruments | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 87	90
Equity instruments | United States | Pension Plans | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78	79
Equity instruments | United States | Pension Plans | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 9	11
Equity instruments | United States | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
Equity instruments | United States | Pension Plans | Maximum | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
Equity instruments | United States | Pension Plans | Maximum | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
Equity instruments | United States | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Equity instruments | United States | Pension Plans | Minimum | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Equity instruments | United States | Pension Plans | Minimum | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Equity instruments | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 558	518
Equity instruments | Non-U.S. | Pension Plans | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	521	486
Equity instruments | Non-U.S. | Pension Plans | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 37	32
Equity instruments | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	25.00%
Equity instruments | Non-U.S. | Pension Plans | Maximum | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	24.00%
Equity instruments | Non-U.S. | Pension Plans | Maximum | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	2.00%
Equity instruments | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Equity instruments | Non-U.S. | Pension Plans | Minimum | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Equity instruments | Non-U.S. | Pension Plans | Minimum | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	1.00%
Equity instruments | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Equity instruments | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	499	462
Equity instruments | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	87	90
Equity instruments | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59	56
Equity instruments | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity instruments | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Debt instrument | United States | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
Debt instrument | United States | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
Debt instrument | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 326	341
Debt instrument | United States | Pension Plans | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	226	233
Debt instrument | United States | Pension Plans | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 100	108
Debt instrument | United States | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
Debt instrument | United States | Pension Plans | Maximum | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
Debt instrument | United States | Pension Plans | Maximum | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
Debt instrument | United States | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
Debt instrument | United States | Pension Plans | Minimum | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
Debt instrument | United States | Pension Plans | Minimum | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
Debt instrument | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,437	1,489
Debt instrument | Non-U.S. | Pension Plans | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	245	251
Debt instrument | Non-U.S. | Pension Plans | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	721	400
Debt instrument | Non-U.S. | Pension Plans | Inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		41
Debt instrument | Non-U.S. | Pension Plans | Government inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	434	763
Debt instrument | Non-U.S. | Pension Plans | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 37	34
Debt instrument | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	40.00%
Debt instrument | Non-U.S. | Pension Plans | Maximum | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	35.00%
Debt instrument | Non-U.S. | Pension Plans | Maximum | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	44.00%
Debt instrument | Non-U.S. | Pension Plans | Maximum | Inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Debt instrument | Non-U.S. | Pension Plans | Maximum | Government inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	31.00%
Debt instrument | Non-U.S. | Pension Plans | Maximum | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	25.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	24.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	32.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum | Inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	9.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum | Government inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	23.00%
Debt instrument | Non-U.S. | Pension Plans | Minimum | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	9.00%
Debt instrument | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Debt instrument | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,226	1,310
Debt instrument | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	326	341
Debt instrument | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	211	179
Debt instrument | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt instrument | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real estate | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Target allocation ranges	0.00%
Real estate | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 200	193
Real estate | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Real estate | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Real estate | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Real estate | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	111	97
Real estate | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real estate | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81	82
Real estate | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real estate | Level 3 | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	14	13
Real estate | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	14
Derivatives | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Target allocation ranges	0.00%
Derivatives | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ (15)	14
Derivatives | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Derivatives | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Derivatives | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	12
Derivatives | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Derivatives | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(23)	2
Derivatives | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Derivatives | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Investment funds | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16	11
Investment funds | United States | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Investment funds | United States | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Investment funds | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 108	98
Investment funds | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Investment funds | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Investment funds | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16	11
Investment funds | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	87	85
Investment funds | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Investment funds | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	13
Investment funds | Level 3 | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	11
Investment funds | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Investment funds | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Assets held by insurance company | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Target allocation ranges	0.00%
Assets held by insurance company | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 107	119
Assets held by insurance company | Non-U.S. | Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Assets held by insurance company | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Assets held by insurance company | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Assets held by insurance company | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Assets held by insurance company | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Assets held by insurance company | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Assets held by insurance company | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Assets held by insurance company | Level 3 | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	105	117	113
Assets held by insurance company | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	105	117
Other | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2	4
Target allocation ranges	0.00%
Other | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 14	28
Other | Non-U.S. | Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Other | Level 1 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Other | Level 1 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	1
Other | Level 2 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other | Level 2 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	19
Other | Level 3 | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	4	8
Other | Level 3 | United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	4
Other | Level 3 | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	8	$ 6
Other | Level 3 | Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 8	$ 8

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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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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