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Taxes - Current and deferred income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense $ (163) $ (234) $ (119)
Deferred tax income 35 192 223
Total income tax (expense)/income (128) (42) 104
Country of domicile      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (17) (118) (14)
Deferred tax income 53 45 96
Foreign countries      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (146) (116) (105)
Deferred tax income $ (18) $ 147 $ 127