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Deferred tax assets and liabilities - Tax loss carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Unrecognized    
Within five years $ 6 $ 3
More than five years 443 443
Not subject to expiry 0 0
Gross value of tax loss carryforwards 449 446
Recognized    
Within five years 55 29
More than five years 375 462
Not subject to expiry 691 681
Gross value of tax loss carryforwards 1,121 1,172
Within five years 61 32
More than five years 818 905
Not subject to expiry 691 681
Gross value of tax loss carryforwards $ 1,570 $ 1,618