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Long-term assets - E.1.6. Impairment testing of goodwill (Details) | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information for cash-generating units [line items] |  |
Goodwill impairment testing, period of planning horizon | 15 years |
Bolivia |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 39.20% | 42.00%
Average CAPEX intensity | 16.80% | 18.40%
Perpetual growth rate | 1.00% | 1.50%
WACC rate after tax | 11.50% | 10.70%
Colombia |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 35.70% | 34.10%
Average CAPEX intensity | 17.70% | 17.70%
Perpetual growth rate | 2.00% | 1.90%
WACC rate after tax | 8.30% | 8.60%
Costa Rica |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 32.90% | 36.30%
Average CAPEX intensity | 17.80% | 23.30%
Perpetual growth rate | 2.00% | 1.90%
WACC rate after tax | 12.10% | 10.10%
El Salvador |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 35.40% | 33.40%
Average CAPEX intensity | 14.00% | 15.20%
Perpetual growth rate | 1.00% | 0.80%
WACC rate after tax | 13.80% | 10.70%
Nicaragua |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 45.60% | 33.70%
Average CAPEX intensity | 15.90% | 16.20%
Perpetual growth rate | 3.00% | 2.00%
WACC rate after tax | 13.80% | 10.90%
Panama |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 48.20% | 42.60%
Average CAPEX intensity | 17.50% | 14.80%
Perpetual growth rate | 1.00% | 1.50%
WACC rate after tax | 7.60% | 8.30%
Paraguay |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 44.30% | 46.90%
Average CAPEX intensity | 15.60% | 16.00%
Perpetual growth rate | 1.00% | 1.60%
WACC rate after tax | 8.40% | 9.00%
Tanzania (Zantel) |  |
Disclosure of information for cash-generating units [line items] |  |
Average EBITDA margin | 39.50% | 31.20%
Average CAPEX intensity | 11.70% | 12.20%
Perpetual growth rate | 1.00% | 1.50%
WACC rate after tax | 13.80% | 14.40%
Perpetual growth rate, measurement input | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 1.00% |
Weighted average cost of capital and perpetual growth rate, measurement input | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 1.00% |
Weighted average cost of capital, measurement input | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 1.00% |
Weighted average cost of capital, measurement input | Colombia | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 0.85% |
Weighted average cost of capital, measurement input | El Salvador | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 0.86% |
Weighted average cost of capital, measurement input | Nicaragua | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 0.57% |
EBITDA Margin, Measurement Input | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | 2.00% |
EBITDA Margin, Measurement Input | Colombia | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | (1.60%) |
EBITDA Margin, Measurement Input | El Salvador | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | (1.47%) |
EBITDA Margin, Measurement Input | Nicaragua | Goodwill Impairment Risk |  |
Disclosure of information for cash-generating units [line items] |  |
Reasonably possible change in risk variable, percent | (1.83%) |

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