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Taxes - Current and deferred income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense $ (202) $ (234) $ (103)
Deferred tax (expense)/income (122) 307 486
Total income tax (expense)/income (324) 73 383
Country of domicile [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (34) (77) (8)
Deferred tax (expense)/income (246) 78 7
Foreign countries [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current income tax expense (168) (157) (95)
Deferred tax (expense)/income $ 124 $ 229 $ 479