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Taxes - Current and deferred income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense $ (119) $ (202) $ (234)
Deferred tax income/(expense) 223 (122) 307
Total income tax income/(expense) 104 (324) 73
Country of domicile [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (14) (34) (77)
Deferred tax income/(expense) 96 (246) 78
Foreign countries [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (105) (168) (157)
Deferred tax income/(expense) $ 127 $ 124 $ 229