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FINANCIAL RISK MANAGEMENT - Credit risk (Details) - ARS ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Credit risk    
Credit risk exposure    
Total financial assets $ 45,628  
Credit risk | Due    
Credit risk exposure    
Total financial assets 8,297  
Credit risk | Not due    
Credit risk exposure    
Total financial assets 37,331  
Cash and cash equivalents | Credit risk    
Credit risk exposure    
Total financial assets 25,582  
Cash and cash equivalents | Credit risk | Not due    
Credit risk exposure    
Total financial assets 25,582  
Investments | Credit risk    
Credit risk exposure    
Total financial assets 1,426  
Investments | Credit risk | Not due    
Credit risk exposure    
Total financial assets 1,426  
Trade receivables    
Credit risk exposure    
Overdue balances not covered by the allowance for doubtful accounts 8,280 $ 11,210
Trade receivables | Credit risk    
Credit risk exposure    
Total financial assets 17,048  
Trade receivables | Credit risk | Due    
Credit risk exposure    
Total financial assets 8,280  
Trade receivables | Credit risk | Not due    
Credit risk exposure    
Total financial assets 8,768  
Other receivables | Credit risk    
Credit risk exposure    
Total financial assets 1,572  
Other receivables | Credit risk | Due    
Credit risk exposure    
Total financial assets 17  
Other receivables | Credit risk | Not due    
Credit risk exposure    
Total financial assets $ 1,555