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Interest expense and other financial income & expense
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Interest expense and other financial income & expense Interest expense and other financial income & expense
For the years ended December 31, 2019, 2018 and 2017, "Interest expense" and "Other financial income & expense" are:
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".
Other financial income & expense
($ millions)
2019

 
2018

 
2017

Interest income
8

 
2

 
—

Loss on extinguishment of financial debt
(4
)
 
—

 
—

Other financial expense
(18
)
 
(3
)
 
(3
)
Monetary loss from hyperinflation accounting
(2
)
 
(1
)
 
—

Currency result, net
(16
)
 
(26
)
 
(20
)
Total other financial income & expense
(32
)
 
(28
)
 
(23
)