v3.25.2
Pension and other postretirement benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Other postretirement benefits plan        
Amortization of:        
Net periodic benefit cost $ 1 $ 1 $ 2 $ 2
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 0 1 0
Interest cost 6 6 12 12
Expected return on assets (6) (5) (11) (10)
Amortization of:        
Past service credit 0 0 0 0
Actuarial loss 0 1 0 2
Settlement gain 0 0 0 0
Net periodic benefit cost 1 2 2 4
Non-U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 10 10 20 20
Interest cost 22 21 42 42
Expected return on assets (26) (22) (49) (44)
Amortization of:        
Past service credit (3) (3) (6) (6)
Actuarial loss 2 1 3 2
Settlement gain 0 0 0 (3)
Net periodic benefit cost $ 5 $ 7 $ 10 $ 11