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Long-term assets - E.1.5. Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Goodwill | $ 1,077 | $ 599
Panama |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 512 | 0
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 | 116 | 123
Paraguay |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 54 | 57
Colombia |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 183 | 199
Tanzania (Zantel) |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | 4 | 10
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill | $ 15 | $ 16

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