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Interest expense and other financial income & expense (Tables) | 12 Months Ended
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Dec. 31, 2020
Analysis of income and expense [abstract] |
Disclosure of components of interest expense | Interest expense
($ millions) | 2020 |  | 2019 |  | 2018 |  |
Interest expense on financial debts | (94) |  |  | (81) |  |  | (10) |  |  |
Interest expense from discounting long-term liabilities | (17) |  |  | (21) |  |  | (9) |  |  |
Interest expense on lease liabilities(1) | (13) |  |  | (11) |  |  | (5) |  |  |
Total interest expense | (124) |  |  | (113) |  |  | (24) |  |  |
(1) For the year ended December 31, 2018, 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
($ millions) | 2020 |  | 2019 |  | 2018 |  |
Interest income | 6 |  |  | 8 |  |  | 2 |  |  |
Loss on extinguishment of financial debt | — |  |  | (4) |  |  | — |  |  |
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) |  |  |

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