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SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Significant accounting policies      
Impairment of Intangible assets $ 376    
Other fixed assets impairment $ 573   $ 978
Minimum      
Significant accounting policies      
Average useful life of leased assets 1 year    
Maximum      
Significant accounting policies      
Average useful life of leased assets 6 years    
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    
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 Arnet      
Significant accounting policies      
Impairment of Intangible assets     $ 3,401
Spectrum      
Significant accounting policies      
Impairment of Intangible assets   $ 2,917  
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