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Long-term assets - E.1.5. Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Goodwill $ 1,659 $ 1,684
Panama    
Disclosure of information for cash-generating units [line items]    
Goodwill 907 907
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 115 123
Paraguay    
Disclosure of information for cash-generating units [line items]    
Goodwill 47 50
Colombia    
Disclosure of information for cash-generating units [line items]    
Goodwill 173 181
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 207 213
Other    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 3 $ 3