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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 |

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