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INTANGIBLE ASSETS - Gross Value (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Intangible assets    
Value, at the beginning of the year $ 4,635  
Value, at the end of the year 59,870 $ 4,635
Gross carrying value    
Intangible assets    
Value, at the beginning of the year 5,653 4,846
Incorporation by merger 59,329  
CAPEX 2,906 807
Currency translation adjustments 127  
Decreases (609)  
Value, at the end of the year 67,406 5,653
Retained earnings adjustment (125)  
Gross carrying value | 3G/4G licenses    
Intangible assets    
Value, at the beginning of the year 3,635 3,635
Incorporation by merger 17,713  
Value, at the end of the year 21,348 3,635
Gross carrying value | PCS license (Argentina)    
Intangible assets    
Incorporation by merger 10,538  
Value, at the end of the year 10,538  
Gross carrying value | Nucleo's licenses    
Intangible assets    
CAPEX 844  
Currency translation adjustments 33  
Value, at the end of the year 877  
Gross carrying value | SRCE license    
Intangible assets    
Value, at the beginning of the year 879 72
CAPEX   807
Value, at the end of the year 879 879
Gross carrying value | Customer relationships    
Intangible assets    
Incorporation by merger 15,771  
Currency translation adjustments 73  
Decreases (609)  
Value, at the end of the year 15,235  
Gross carrying value | Brands    
Intangible assets    
Value, at the beginning of the year 249 249
Incorporation by merger 13,030  
Value, at the end of the year 13,279 249
Gross carrying value | Incremental Cost from the acquisition of contracts    
Intangible assets    
CAPEX 1,348  
Currency translation adjustments 7  
Value, at the end of the year 1,355  
Gross carrying value | Other    
Intangible assets    
Value, at the beginning of the year 890 890
Incorporation by merger 2,277  
CAPEX 714  
Currency translation adjustments 14  
Value, at the end of the year $ 3,895 $ 890