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Taxes - (Loss) before taxes (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] |  |  |
(Loss) before taxes | $ (332) | $ (300) | $ (127)
Country of domicile [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
(Loss) before taxes | (274) | (227) | (104)
Foreign countries [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
(Loss) before taxes | $ (58) | $ (73) | $ (23)

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