Pension and other postretirement benefits - Schedule of Expected Future Benefit Payments (Details) $ in Millions	Dec. 31, 2025 USD ($)
Pension Plan \| U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2026	$ 7
2027	7
2028	7
2029	7
2030	6
2031-2035	29
Pension Plan \| Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2026	21
2027	18
2028	18
2029	18
2030	17
2031-2035	83
Other Postretirement Benefits Plan \| U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2026	7
2027	6
2028	6
2029	4
2030	4
2031-2035	15
Other Postretirement Benefits Plan \| Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2026	4
2027	4
2028	4
2029	4
2030	4
2031-2035	$ 22

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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