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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, 2018
USD ($)
$ / $
Dec. 31, 2018
ARS ($)
Dec. 31, 2017
ARS ($)
Financial risk management      
NDF $ 166    
Borrowings   $ 79,312 $ 16,009
Currency risk      
Financial risk management      
Net liability position in foreign currency $ 1,939 73,106 $ 8,073
Estimated variation in exchange rate | $ / $ 1.00    
Estimated variation in consolidated amounts of foreign currency position   1,939  
Net liability position in foreign currency not covered by NDF $ 1,773 66,848  
Estimated variation in consolidated amounts of foreign currency position on the portion not covered by derivative financial instruments and other assets   1,773  
Interest rate risk      
Financial risk management      
NDF at variable rate $ 440    
Borrowings   52,767  
Net financial debt not hedged   36,179  
Variation in agreed interest rates (as a percent) 0.10%    
Effect   $ 36