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Long-term assets - E.1.6. Impairment testing of goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]    
Impairment loss recognised in profit or loss, goodwill   $ 6
Bolivia    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 42.00% 43.10%
Average CAPEX intensity 18.40% 17.00%
Perpetual growth rate 1.50% 3.00%
WACC rate after tax 10.70% 10.20%
Chad    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin   26.70%
Average CAPEX intensity   15.90%
Perpetual growth rate   2.60%
WACC rate after tax   14.80%
Colombia    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 34.10% 32.10%
Average CAPEX intensity 17.70% 19.30%
Perpetual growth rate 1.90% 2.90%
WACC rate after tax 8.60% 8.90%
Costa Rica    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 36.30% 41.20%
Average CAPEX intensity 23.30% 19.90%
Perpetual growth rate 1.90% 3.10%
WACC rate after tax 10.10% 10.20%
El Salvador    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 33.40% 42.20%
Average CAPEX intensity 15.20% 15.70%
Perpetual growth rate 0.80% 1.60%
WACC rate after tax 10.70% 11.70%
Nicaragua    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 33.70% 41.00%
Average CAPEX intensity 16.20% 49.60%
Perpetual growth rate 2.00% 3.60%
WACC rate after tax 10.90% 10.10%
Panama    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 42.60%  
Average CAPEX intensity 14.80%  
Perpetual growth rate 1.50%  
WACC rate after tax 8.30%  
Paraguay    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 46.90% 50.40%
Average CAPEX intensity 16.00% 17.30%
Perpetual growth rate 1.60% 3.00%
WACC rate after tax 9.00% 9.80%
Tanzania (Zantel)    
Disclosure of information for cash-generating units [line items]    
Average EBITDA margin 31.20% 37.10%
Average CAPEX intensity 12.20% 18.50%
Perpetual growth rate 1.50% 4.60%
WACC rate after tax 14.40% 14.40%
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 | Goodwill Impairment Risk | Nicaragua    
Disclosure of information for cash-generating units [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Potential impairment $ 32  
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%  
Perpetual growth rate, measurement input | Goodwill Impairment Risk | Nicaragua    
Disclosure of information for cash-generating units [line items]    
Reasonably possible change in risk variable, percent (1.00%)  
Potential impairment $ 18  
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 | Goodwill Impairment Risk | Nicaragua    
Disclosure of information for cash-generating units [line items]    
Reasonably possible change in risk variable, percent (2.00%)  
Potential impairment $ 1  
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 and perpetual growth rate, measurement input | Goodwill Impairment Risk | Nicaragua    
Disclosure of information for cash-generating units [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Potential impairment $ 63