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Pension and other postretirement benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Plan | U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 1 1 2 2
Expected return on assets 0 0 0 0
Net periodic pension benefit cost  1 1 2 2
Pension Plan | Non-U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 1 1 2
Interest cost 3 8 5 16
Expected return on assets (3) (8) (5) (16)
Net periodic pension benefit cost  0 1 1 2
Other Postretirement Benefits Plan | U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 0 0 0
Interest cost 1 0 2 1
Amortization of actuarial gain (1) 0 (2) (1)
Net periodic pension benefit cost  0 0 0 0
Other Postretirement Benefits Plan | Non-U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 0 0 0
Interest cost 1 1 2 2
Amortization of actuarial gain 0 0 0 0
Net periodic pension benefit cost  $ 1 $ 1 $ 2 $ 2