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INVENTORIES (Details) - ARS ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories and allowance for obsolescence of inventories      
Inventories $ 3,212 $ 4,210  
Gross carrying value      
Inventories and allowance for obsolescence of inventories      
Inventories 3,438 4,415  
Gross carrying value | Mobile handsets and others      
Inventories and allowance for obsolescence of inventories      
Inventories 2,248 3,467  
Gross carrying value | Radio equipment and others      
Inventories and allowance for obsolescence of inventories      
Inventories 1 99  
Gross carrying value | Fixed telephones and equipment      
Inventories and allowance for obsolescence of inventories      
Inventories 66 23  
Gross carrying value | Inventories for construction projects      
Inventories and allowance for obsolescence of inventories      
Inventories 1,123 826  
Accumulated impairment      
Inventories and allowance for obsolescence of inventories      
Inventories $ (226) $ (205) $ (82)