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SEGMENT REPORTING - Additional Information (Details) - ARS ($)
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]        
Annual sales   $ 41,649,711,000 $ 38,018,440,000 $ 35,765,451,000
Small companies, individuals and companies | Small companies, individuals and companies        
Disclosure of operating segments [line items]        
Annual sales $ 100,000      
Small and Medium Size Companies | Small and Medium Size Companies | Minimum        
Disclosure of operating segments [line items]        
Annual sales 100,000      
Small and Medium Size Companies | Small and Medium Size Companies | Maximum        
Disclosure of operating segments [line items]        
Annual sales 700,000      
Megras | Megras | Minimum        
Disclosure of operating segments [line items]        
Annual sales 2,500,000      
Megras | Megras | Maximum        
Disclosure of operating segments [line items]        
Annual sales 700,000      
Grandes companies | Grandes companies        
Disclosure of operating segments [line items]        
Annual sales $ 2,500,000