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Inventories - Cost of equipment and handsets (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cost of equipment and handsets      
Inventories at the beginning of the year $ (1,332) $ (2,279) $ (794)
Plus:      
Equipment acquisitions (7,416) (5,491) (6,233)
SAC deferred costs (Note 3.j) 80 130 93
Decreases net of allowance of obsolescence 20 49 25
Handsets lent to customers at no cost 56 54 32
Decreases not charged to cost of equipment 7 17 3
Less:      
Inventories at the end of the year 1,901 1,332 2,279
Cost of equipments and handsets $ (6,684) $ (6,188) $ (4,595)