v3.25.4
Pension and other postretirement benefits - Schedule of Target Asset Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 246 $ 175 $ 669
Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 68 28  
Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 86 52  
Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 92 95 494
Cash and cash equivalents | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 5 2  
Cash and cash equivalents | Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 5 2  
Cash and cash equivalents | Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Cash and cash equivalents | Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Equity instruments | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 56 28  
Equity instruments | Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 54 26  
Equity instruments | Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Equity instruments | Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 2 2 26
Debt instruments | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 62 52  
Debt instruments | Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 9 0  
Debt instruments | Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 53 52  
Debt instruments | Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Other | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 33    
Other | Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0    
Other | Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 33    
Other | Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0    
Insurance contracts | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 90 93  
Insurance contracts | Level 1 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Insurance contracts | Level 2 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 0 0  
Insurance contracts | Level 3 | Non-U.S. | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 90 $ 93 $ 468
Minimum | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 0.00%    
Minimum | Equity instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 17.00%    
Minimum | Debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 0.00%    
Minimum | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 7.00%    
Maximum | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 10.00%    
Maximum | Equity instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 50.00%    
Maximum | Debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 72.00%    
Maximum | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation percentage 39.00%