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FINANCIAL INSTRUMENTS - Hedge accounting (Details) $ in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 ARS ($)	Dec. 31, 2019 ARS ($)	Dec. 31, 2018 ARS ($)	Dec. 31, 2019 USD ($) $ / $	Dec. 31, 2019 ARS ($) $ / $	May 29, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / $	Dec. 31, 2018 ARS ($) $ / $	Dec. 31, 2017 USD ($) tranche	Dec. 31, 2017 ARS ($) tranche
Hedge accounting
Notional amount				$ 289,676.0		$ 300.0
Receivables recognized, Non-current					$ 53			$ 58
Deferred income/expense before income tax		$ (335)	$ 197
NDF
Hedge accounting
Total NDF agreement amount								166
NDF | Fair value hedges
Hedge accounting
Other liability of hedging instrument		133
Current other liability on hedge instrument					117
Non-current liability of hedging instrument					16
Liability of hedging instruments					10
Current liability of hedging instrument					8
Non-current liability of hedging instrument					$ 2
Net gain/loss		52	8
NDF | Currency risk | Fair value hedges | Foreign currency exchange rate gains
Hedge accounting
Notional amount				$ 118.0
Average exchange rate | $ / $				39.33	39.33
NDF | Currency risk | Exchange rate hedges
Hedge accounting
Notional amount				$ 499.0			$ 306.0
Average exchange rate | $ / $				52.50	52.50
Liability of hedging instruments					$ 236			153
Net gain/loss		1,099
Total NDF agreement amount				$ 46.5			$ 166.0
Receivables recognized					$ 163
Gains recognized from receivables			985
NDF | Currency risk | Exchange rate hedges | Foreign currency exchange rate gains
Hedge accounting
Net gain/loss	$ 385	$ 234
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges
Hedge accounting
Notional amount									$ 400.0
Receivables recognized								211
Gains recognized from receivables			4
Receivables recognized, Current								151
Receivables recognized, Non-current								60
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Minimum
Hedge accounting
Interest rate (as a percent)									0.02087%	0.02087%
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Maximum
Hedge accounting
Interest rate (as a percent)									0.02453%	0.02453%
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Weighted average
Hedge accounting
Interest rate (as a percent)									0.02226%	0.02226%
NDF | Effective from March 15, 2017 | Currency risk | Fair value hedges
Hedge accounting
Notional amount									$ 300.0
NDF | Effective from September 15, 2017 | Currency risk | Fair value hedges
Hedge accounting
Notional amount									100.0
NDF | Effective from March 15, 2018 | Currency risk | Fair value hedges
Hedge accounting
Total Hedged amount										$ 100
Notional amount									$ 40.0
Number of Tranches | tranche									2	2
Receivables recognized								28
Gains recognized from receivables			$ 6
Receivables recognized, Current								18
Receivables recognized, Non-current								$ 10
NDF | Maturing between June 2018 and May 2019 | Currency risk | Exchange rate hedges
Hedge accounting
Average exchange rate | $ / $							36.58	36.58
2.1325% NDF | Effective from March 15, 2018 | Currency risk | Fair value hedges
Hedge accounting
Notional amount									$ 20.0
Interest rate (as a percent)									0.02133%	0.02133%
2.085% NDF | Effective from March 15, 2018 | Currency risk | Fair value hedges
Hedge accounting
Notional amount									$ 20.0
Interest rate (as a percent)									0.02085%	0.02085%

X

- Definition

The average price of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

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