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Interest expense and other financial income & expense (Tables)
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Disclosure of components of interest expense
Interest expense
($ millions)
2019

 
2018

 
2017

Interest expense on financial debts
(81
)
 
(10
)
 
(12
)
Interest expense from discounting long-term liabilities
(21
)
 
(9
)
 
(10
)
Interest expense on lease liabilities(1)
(11
)
 
(5
)
 
(5
)
Total interest expense
(113
)
 
(24
)
 
(27
)

(1)
For the years ended December 31, 2018 and 2017, interest expense on finance leases was included in "Interest expense on lease liabilities".
Disclosure of components of other financial income & expense
Other financial income & expense