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FINANCIAL INSTRUMENTS - Gains and losses (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
FINANCIAL INSTRUMENTS    
Net gain (loss) on financial assets at amortised cost $ 7,544 $ (285)
Net gain (loss) on financial liabilities at amortised cost (41,540) (1,229)
Net gain (loss) on financial assets at fair value through profit or loss 2,237 265
Net gain (loss) on financial liabilities at fair value through profit or loss (229)  
Total gain (loss) on financial instruments (31,988) (1,249)
Interest on financial assets at amortised cost 1,863 201
Interest on financial liabilities at amortised cost (6,307) (2,185)
Interest on financial assets at fair value through profit or loss 1,019  
Total interest income (expense) on financial instruments $ (3,425) $ (1,984)