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FINANCIAL RISK MANAGEMENT - Credit risk (Details) - ARS ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Credit risk    
Credit risk exposure    
Total financial assets $ 33,353  
Credit risk | Due    
Credit risk exposure    
Total financial assets 7,287  
Credit risk | Not due    
Credit risk exposure    
Total financial assets 26,066  
Cash and cash equivalents | Credit risk    
Credit risk exposure    
Total financial assets 6,891  
Cash and cash equivalents | Credit risk | Not due    
Credit risk exposure    
Total financial assets 6,891  
Investments | Credit risk    
Credit risk exposure    
Total financial assets 5,998  
Investments | Credit risk | Not due    
Credit risk exposure    
Total financial assets 5,998  
Trade receivables    
Credit risk exposure    
Overdue balances not covered by the allowance for doubtful accounts 7,278 $ 1,521
Trade receivables | Credit risk    
Credit risk exposure    
Total financial assets 17,476  
Trade receivables | Credit risk | Due    
Credit risk exposure    
Total financial assets 7,287  
Trade receivables | Credit risk | Not due    
Credit risk exposure    
Total financial assets 10,189  
Other receivables | Credit risk    
Credit risk exposure    
Total financial assets 2,988  
Other receivables | Credit risk | Not due    
Credit risk exposure    
Total financial assets $ 2,988