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Litigation and contingencies (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 03, 2024 | Oct. 22, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Loss Contingencies [Line Items] |  |  |  |
Amount related to unreserved tax-related matters, inclusive of interest (up to) |  |  | $ 85 |
Loss contingency, settlement amount |  | $ 4 |  |
Loss contingency, other party settlement amount | $ 40 |  |  |
Litigation settlement received |  |  | $ 15 |
Other Current Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Other accrued liabilities |
Other Noncurrent Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Other long-term liabilities |
Elmira Site |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental remediation estimated liability |  |  | $ 24 | $ 28
Environmental recoveries receivable |  |  | 33 |
Elmira Site | Other Current Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental remediation estimated liability |  |  | 8 | 13
Elmira Site | Other Noncurrent Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Environmental remediation estimated liability |  |  | $ 16 | $ 15

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