v3.25.4
Pension and other postretirement benefits - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined contribution plan, cost   $ 91 $ 78 $ 70
Contributions to union-sponsored multiemployer pension plans   37 35 35
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Plan transfer in   55    
Total pension plan obligations transferred to plan   53    
Incremental net pension plant assets   2    
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Plan transfer in   0 0  
Settlements   0 0  
Settlement loss   0 0 33
Expected future contributions   7    
U.S. | Other Postretirement Benefits Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected future contributions   7    
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Plan transfer in   55 0  
Settlements   0 496  
Settlement loss   0 61 $ 0
Expected future contributions   10    
Non-U.S. | Other Postretirement Benefits Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Expected future contributions   $ 4    
Canada | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlements $ 99      
Settlement loss     $ 61