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FINANCIAL INSTRUMENTS - Gains and losses (Details) - ARS ($) $ in Millions | 12 Months Ended
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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)

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