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FINANCIAL RISK MANAGEMENT - Sensitivity analysis of exchange and interest rate risk (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2019
ARS ($)
Dec. 31, 2018
ARS ($)
Financial risk management      
Borrowings   $ 151,996 $ 122,012
NDF $ 47    
Currency risk      
Financial risk management      
Net liability position in foreign currency $ 2,252 137,670 $ 112,465
Estimated variation in exchange rate | $ / $ 1.00    
Estimated variation in consolidated amounts of foreign currency position   2,252  
Interest rate risk      
Financial risk management      
Borrowings   48,554  
NDF at variable rate $ 440    
Net financial debt not hedged   22,202  
Variation in agreed interest rates (as a percent) 1.00%    
Effect   $ 222