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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]        
Interest income   $ 8 $ 2 $ 0
Loss on extinguishment of financial debt $ (4) (4) 0 0
Other financial expense   (18) (3) (3)
Monetary loss from hyperinflation accounting   (2) (1) 0
Currency result, net   (16) (26) (20)
Total other financial income & expense   $ (32) $ (28) $ (23)