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Employee benefit obligations - Expected total benefit payments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Later than one year member  
Disclosure of defined benefit plans [line items]  
Benefit $ 22
Later than two years and not later than three years [member]  
Disclosure of defined benefit plans [line items]  
Benefit 18
Later than three years and not later than four years [member]  
Disclosure of defined benefit plans [line items]  
Benefit 20
Later than four years and not later than five years [member]  
Disclosure of defined benefit plans [line items]  
Benefit 20
Later than five years [member]  
Disclosure of defined benefit plans [line items]  
Benefit 21
Subsequent five years  
Disclosure of defined benefit plans [line items]  
Benefit $ 111