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Interest expense and other financial income & expense - Other financial income & expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 23, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]        
Interest income   $ 6 $ 8 $ 2
Loss on extinguishment of financial debt $ (4) 0 (4) 0
Other financial expense   (9) (18) (3)
Monetary loss from hyperinflation accounting   (4) (2) (1)
Currency result, net   (22) (16) (26)
Total other financial income & expense   $ (29) $ (32) $ (28)