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Pension and other postretirement benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Other postretirement benefits plan        
Amortization of:        
Net periodic benefit cost (ii) (iii) $ 1 $ 1 $ 2 $ 2
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 6 6 12 12
Expected return on assets (5) (5) (10) (10)
Amortization of:        
Past service credit 0 0 0 0
Actuarial loss 1 1 2 2
Settlement gain (i) 0 0 0 0
Net periodic benefit cost (ii) (iii) 2 2 4 4
Non-U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 10 8 20 16
Interest cost 21 22 42 46
Expected return on assets (22) (23) (44) (46)
Amortization of:        
Past service credit (3) (3) (6) (6)
Actuarial loss 1 0 2 0
Settlement gain (i) 0 0 (3) 0
Net periodic benefit cost (ii) (iii) $ 7 $ 4 $ 11 $ 10