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Taxes - (Loss) before taxes (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]      
(Loss) before taxes $ (635) $ (332) $ (300)
Country of domicile [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
(Loss) before taxes (585) (274) (227)
Foreign countries [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
(Loss) before taxes $ (50) $ (58) $ (73)