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OPERATING EXPENSES - Cost of equipment and handsets (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost of equipment and handsets      
Inventories at the beginning of the year $ (189) $ (515) $ (9)
Plus:      
Incorporation by merger (2,739) (232) (47)
Purchases (9,608) (285) (1,341)
Other (20) 350  
Less:      
Inventories at the end of the year 2,889 189 515
Cost of equipment and handsets $ (9,667) $ (493) $ (882)