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Capital structure and financing - C.7.4. Call and put options (Details) - USD ($) $ in Millions | Aug. 29, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 13, 2018
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Disclosure of detailed information about business combination [line items] |  |  |  |  |
Add (less) derivatives related to debt (note D.1.2.) |  | $ (12) | $ 17 |  |
Put option liability |  | 262 | $ 264 | [1] |
Option contract |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Notional amount |  | $ 3 |  |  |
Cable Onda S.A |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage ownership held by non-controlling interest | 20.00% |  |  |  |
Add (less) derivatives related to debt (note D.1.2.) |  |  |  |  | $ 239
Threshold for ownership percentage of counterparty to make call option exercisable | 10.00% |  |  |  |
Enterprise value of acquired entity | $ 1,460 |  |  |  |
Interest rate on put option | 5.00% |  |  |  |
Interest rate on call option | 10.00% |  |  |  |
[1] | The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).

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