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Long-term assets - E.1.5. Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Goodwill | $ 1,659 | $ 1,684
Panama |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 907 | 907
El Salvador |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 194 | 194
Costa Rica |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 115 | 123
Paraguay |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 47 | 50
Colombia |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 173 | 181
Tanzania (Zantel) |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 12 | 12
Nicaragua |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 207 | 213
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | $ 3 | $ 3

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