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Long-term assets - E.1.5. Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]    
Goodwill $ 1,711 $ 1,069
Panama    
Disclosure of information for cash-generating units [line items]    
Goodwill 930 504
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 123 116
Paraguay    
Disclosure of information for cash-generating units [line items]    
Goodwill 50 54
Colombia    
Disclosure of information for cash-generating units [line items]    
Goodwill 181 183
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 217 4
Other    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 3 $ 3