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Deferred tax assets and liabilities - Tax loss carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Unrecognized [Abstract]    
Within five years $ 3 $ 0
More than five years 443 438
Not subject to expiry 0 0
Gross value of tax loss carryforwards 446 438
Recognized [Abstract]    
Within five years 29 45
More than five years 462 608
Not subject to expiry 681 776
Gross value of tax loss carryforwards 1,172 1,429
Within five years 32 45
More than five years 905 1,046
Not subject to expiry 681 776
Gross value of tax loss carryforwards $ 1,618 $ 1,867