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Long-term assets - E.1.5. Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [line items]    
Goodwill $ 1,077 $ 599
Panama    
Disclosure of information for cash-generating units [line items]    
Goodwill 512 0
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 116 123
Paraguay    
Disclosure of information for cash-generating units [line items]    
Goodwill 54 57
Colombia    
Disclosure of information for cash-generating units [line items]    
Goodwill 183 199
Tanzania (Zantel)    
Disclosure of information for cash-generating units [line items]    
Goodwill 4 10
Other    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 15 $ 16