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Interest expense and other financial income & expense - Interest expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
Interest expense on financial debts $ (94) $ (81) $ (10)
Interest expense from discounting long-term liabilities (17) (21) (9)
Interest expense on lease liabilities (13) (11) (5)
Total interest expense $ (124) $ (113) $ (24)