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Long-term assets - E.1.6. Impairment testing of goodwill (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of information for cash-generating units [line items]    
Goodwill impairment testing, period of planning horizon 10 years  
Goodwill, impairment testing, sensitivity analysis term 5 years  
Nicaragua    
Disclosure of information for cash-generating units [line items]    
WACC rate, impairment loss test, Bits Per Second   1.09%
Average EBITDA margin, impairment loss test, Bits Per Second   (1.95%)
Minimum    
Disclosure of information for cash-generating units [line items]    
WACC rates, sensitivity analysis, changes in key assumptions (in percent) (2.00%) (2.00%)
Perpetual growth rate, , sensitivity analysis, changes in key assumptions (in percent) (1.00%) (1.00%)
EBITDA margin, sensitivity analysis, changes in key assumptions (in percent) (3.00%) (3.00%)
CAPEX intensity, sensitivity analysis, changes in key assumptions (in percent) (2.00%) (1.00%)
Maximum    
Disclosure of information for cash-generating units [line items]    
WACC rates, sensitivity analysis, changes in key assumptions (in percent) 2.00% 2.00%
Perpetual growth rate, , sensitivity analysis, changes in key assumptions (in percent) 1.00% 1.00%
EBITDA margin, sensitivity analysis, changes in key assumptions (in percent) 3.00% 3.00%
CAPEX intensity, sensitivity analysis, changes in key assumptions (in percent) 2.00% 1.00%
Bolivia    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 47.70% 46.90%
Average CAPEX intensity 14.30% 14.80%
Perpetual growth rate 0.50% 1.00%
WACC rate after tax 13.60% 22.90%
Colombia    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 45.10% 41.40%
Average CAPEX intensity 15.00% 11.20%
Perpetual growth rate 0.50% 2.00%
WACC rate after tax 9.50% 8.90%
Costa Rica    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 35.80% 37.70%
Average CAPEX intensity 13.20% 16.40%
Perpetual growth rate 0.50% 0.00%
WACC rate after tax 8.20% 8.20%
Ecuador    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 47.50%  
Average CAPEX intensity 12.70%  
Perpetual growth rate 1.00%  
WACC rate after tax 11.70%  
El Salvador    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 48.80% 47.80%
Average CAPEX intensity 13.80% 11.90%
Perpetual growth rate 1.00% 1.00%
WACC rate after tax 10.60% 10.20%
Guatemala    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 56.70% 55.90%
Average CAPEX intensity 9.60% 8.30%
Perpetual growth rate 1.00% 1.00%
WACC rate after tax 8.90% 8.70%
Nicaragua    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 51.70% 50.50%
Average CAPEX intensity 14.50% 15.10%
Perpetual growth rate 0.50% 2.00%
WACC rate after tax 13.10% 15.30%
Panama    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 51.20% 51.00%
Average CAPEX intensity 11.90% 10.90%
Perpetual growth rate 1.00% 1.00%
WACC rate after tax 8.80% 9.40%
Paraguay    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 52.20% 50.80%
Average CAPEX intensity 11.80% 12.90%
Perpetual growth rate 0.50% 0.00%
WACC rate after tax 8.80% 8.60%
Uruguay    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 47.50%  
Average CAPEX intensity 9.50%  
Perpetual growth rate 1.00%  
WACC rate after tax 7.60%