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Employee benefit obligations - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption $ 11  
Best estimate of contributions expected to be paid to defined benefit schemes $ 6 $ 8
Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Decrease in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption $ (19) (21)
Increase in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption $ 22 24
Inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Decrease in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption $ (9) (11)
Increase in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption $ 10 12
Salary increase rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Decrease in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption $ (10) (11)
Increase in actuarial assumption (as a percent) 0.50%  
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption   12
Impact of increasing the life expectancy    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption $ 6 $ 7