Pension and other postretirement benefits - Schedule of Expected Future Benefit Payments (Details) $ in Millions	Dec. 31, 2025 USD ($)
OPEB
Defined Benefit Plan Disclosure [Line Items]
2026	$ 6
2027	6
2028	6
2029	6
2030	7
2031-2035	35
Employer contributions	6
United States \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2026	38
2027	37
2028	37
2029	37
2030	36
2031-2035	174
Employer contributions	12
Non-U.S. \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2026	137
2027	132
2028	132
2029	131
2030	132
2031-2035	665
Employer contributions	$ 34

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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