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FINANCIAL INSTRUMENTS - Hedge accounting (Details) - Cash flow hedges $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 ARS ($) $ / $ | Dec. 31, 2019 ARS ($) $ / $ | Dec. 31, 2018 ARS ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 ARS ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 ARS ($) | Dec. 31, 2017 USD ($)
LIBOR Hedges | IFC Loan |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 400.0
LIBOR Hedges | IIC Loan |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 100.0
LIBOR Hedges | NDF |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 440.0
LIBOR Hedges | NDF | Minimum |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Annual rate of interest |  |  |  |  |  |  |  | 2.085%
LIBOR Hedges | NDF | Maximum |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Annual rate of interest |  |  |  |  |  |  |  | 2.4525%
LIBOR Hedges | NDF | Other Financial Debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Liabilities recognized during the period | $ 461 | $ 189 |  |  |  |  |  |
LIBOR Hedges | NDF | Current Other Financial Debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Liabilities recognized during the period | 450 | 170 |  |  |  |  |  |
LIBOR Hedges | NDF | Non-current Other Financial Debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Liabilities recognized during the period | 11 | 19 |  |  |  |  |  |
LIBOR Hedges | NDF | Debt financial expenses - Interests on financial debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Gains recognized on change in fair value of derivatives |  | $ 82 | $ 13 |  |  |  |  |
Losses recognized on change in fair value of derivatives | $ 293 |  |  |  |  |  |  |
Exchange Rate Hedges | NDF |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 477.0 |  | $ 499.0 |  |
Average exchange rate as a result of hedge | $ / $ | 87.54 | 52.50 |  |  |  |  |  |
NDF Agreement, Balance |  |  |  | $ 117.0 |  | $ 46.5 |  |
Exchange Rate Hedges | NDF | Current Other receivables |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Current interest receivable |  |  |  |  | $ 2 |  | $ 222 |
Exchange Rate Hedges | NDF | Current Financial Debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Current interest liability |  |  |  |  | $ 66 |  | $ 321 |
Exchange Rate Hedges | NDF | Debt financial expenses - Interests on financial debt |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Gains recognized on change in fair value of derivatives |  |  | 2,338 |  |  |  |  |
Exchange Rate Hedges | NDF | Other financial results, net - Other exchange differences |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Losses recognized on change in fair value of derivatives |  |  | $ 319 |  |  |  |  |
Exchange Rate Hedges | NDF | Debt financial expenses - Foreign currency exchange losses on financial debts |  |  |  |  |  |  |  |
Hedge accounting |  |  |  |  |  |  |  |
Gains recognized on change in fair value of derivatives |  | $ 972 |  |  |  |  |  |
Losses recognized on change in fair value of derivatives | $ 1,523 |  |  |  |  |  |  |

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