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Pension and other postretirement benefits - Schedule of Target Allocation Ranges (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
United States | Equity instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Equity instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Debt instrument | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Debt instrument | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 449	$ 446	$ 601
United States | Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Fair value of plan assets	$ 3	4
United States | Pension Plans | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 90	83
United States | Pension Plans | Equity instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Equity instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 79	73
United States | Pension Plans | Equity instruments | Developed markets | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Equity instruments | Developed markets | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11	10
United States | Pension Plans | Equity instruments | Emerging markets | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Equity instruments | Emerging markets | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 341	317
United States | Pension Plans | Debt instrument | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Debt instrument | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Debt instrument | Non-government debt instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Debt instrument | Non-government debt instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Debt instrument | Government fixed interest instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Debt instrument | Government fixed interest instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Fair value of plan assets	$ 0	0
United States | Pension Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Fair value of plan assets	$ 0	0
United States | Pension Plans | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11	34
United States | Pension Plans | Investment funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Investment funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
United States | Pension Plans | Assets held by insurance company
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Fair value of plan assets	$ 0	0
United States | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Fair value of plan assets	$ 4	8
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,524	2,316	$ 3,015
Non-U.S. | Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 65	53
Non-U.S. | Pension Plans | Cash and cash equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Cash and cash equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 518	501
Non-U.S. | Pension Plans | Equity instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Non-U.S. | Pension Plans | Equity instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	25.00%
Non-U.S. | Pension Plans | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 486	470
Non-U.S. | Pension Plans | Equity instruments | Developed markets | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Non-U.S. | Pension Plans | Equity instruments | Developed markets | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	22.00%
Non-U.S. | Pension Plans | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 32	31
Non-U.S. | Pension Plans | Equity instruments | Emerging markets | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	1.00%
Non-U.S. | Pension Plans | Equity instruments | Emerging markets | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	2.00%
Non-U.S. | Pension Plans | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,489	1,324
Non-U.S. | Pension Plans | Debt instrument | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	20.00%
Non-U.S. | Pension Plans | Debt instrument | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	35.00%
Non-U.S. | Pension Plans | Debt instrument | Non-government debt instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	11.00%
Non-U.S. | Pension Plans | Debt instrument | Non-government debt instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	18.00%
Non-U.S. | Pension Plans | Debt instrument | Government fixed interest instruments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	17.00%
Non-U.S. | Pension Plans | Debt instrument | Government fixed interest instruments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	32.00%
Non-U.S. | Pension Plans | Debt instrument | Government inflation-protected bonds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	31.00%
Non-U.S. | Pension Plans | Debt instrument | Government inflation-protected bonds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	40.00%
Non-U.S. | Pension Plans | Debt instrument | Asset-backed securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	4.00%
Non-U.S. | Pension Plans | Debt instrument | Asset-backed securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Non-U.S. | Pension Plans | Debt instrument | Inflation-protected bonds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	4.00%
Non-U.S. | Pension Plans | Debt instrument | Inflation-protected bonds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Non-U.S. | Pension Plans | Debt instrument | Structured debt | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	4.00%
Non-U.S. | Pension Plans | Debt instrument | Structured debt | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Non-U.S. | Pension Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 193	194
Non-U.S. | Pension Plans | Real estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Real estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Non-U.S. | Pension Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 14	7
Non-U.S. | Pension Plans | Derivatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Derivatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 98	88
Non-U.S. | Pension Plans | Investment funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Investment funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Assets held by insurance company
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 119	115
Non-U.S. | Pension Plans | Assets held by insurance company | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Assets held by insurance company | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 28	$ 34
Non-U.S. | Pension Plans | Other | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Other | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%

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