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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