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Pension and other postretirement benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other postretirement benefits plan    
Amortization of:    
Net periodic benefit cost $ 1 $ 1
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 6 6
Expected return on assets (5) (5)
Amortization of:    
Past service credit 0 0
Actuarial loss 0 1
Settlement gain 0 0
Net periodic benefit cost 1 2
Non-U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 10 10
Interest cost 20 21
Expected return on assets (23) (22)
Amortization of:    
Past service credit (3) (3)
Actuarial loss 1 1
Settlement gain 0 (3)
Net periodic benefit cost $ 5 $ 4