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Taxes - Current and deferred income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) $ (167) $ (163) $ (234)
Deferred tax income 309 35 192
Total income tax income/(expense) 142 (128) (42)
Country of domicile      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) (74) (17) (118)
Deferred tax income 313 53 45
Foreign countries      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax (expense) (93) (146) (116)
Deferred tax income $ (4) $ (18) $ 147