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SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Significant accounting policies    
Other fixed assets impairment $ 421 $ 718
Incremental Costs from the Acquisition of Contracts    
Significant accounting policies    
Average period for amortization 2 years  
3G/4G licenses    
Significant accounting policies    
Average period for amortization 180 months  
Nucleo's licenses - PCS    
Significant accounting policies    
Average period for amortization 60 months  
Nucleo's licenses - 700 MHz-band spectrum    
Significant accounting policies    
Average period for amortization 10 years  
SRCE license    
Significant accounting policies    
Amortized over the estimated term 15 years  
Internet and data transmission license (Paraguay)    
Significant accounting policies    
Average period for amortization 5 years  
Fixed-telephony customers    
Significant accounting policies    
Amortized over the estimated term 10 years  
Brand Cablevision    
Significant accounting policies    
Amortized over the estimated term 50 years  
Brand Flow    
Significant accounting policies    
Amortized over the estimated term 3 years  
Brand Arnet    
Significant accounting policies    
Impairment of Intangible assets   $ 2,498
Spectrum    
Significant accounting policies    
Impairment of Intangible assets $ 2,143  
Other Exclusivity Rights, Rights of Use | Minimum    
Significant accounting policies    
Average period for amortization 5 years  
Other Exclusivity Rights, Rights of Use | Maximum    
Significant accounting policies    
Average period for amortization 28 years  
Argentina | Mobile telephony customers    
Significant accounting policies    
Amortized over the estimated term 6 years  
Paraguay | Mobile telephony customers    
Significant accounting policies    
Amortized over the estimated term 5 years