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FINANCIAL INSTRUMENTS - Hedge accounting (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018 ARS ($)	Dec. 31, 2018 ARS ($)	Dec. 31, 2017 ARS ($)	Dec. 31, 2018 USD ($) tranche	Dec. 31, 2018 ARS ($) tranche	Dec. 31, 2017 USD ($) $ / item ARS ($)
Hedge accounting
Receivables recognized, Non-current					$ 38,000,000
Deferred income/expense before income tax		$ 128,000,000
NDF | Currency risk | Fair value hedges | Foreign currency exchange rate gains
Hedge accounting
Notional amount				$ 118.0
Average exchange rate					39.33
NDF | Currency risk | Exchange rate hedges
Hedge accounting
Notional amount				306.0		$ 53.5
Average exchange rate					36.58
Liability of hedging instruments					$ 100,000,000
Net gain/loss		1,039,000,000
Total NDF agreement amount				$ 166.0
Receivables recognized					640,000,000
Gains recognized from receivables	$ 77,000,000
NDF | Currency risk | Exchange rate hedges | Foreign currency exchange rate gains
Hedge accounting
Net gain/loss		152,000,000
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges
Hedge accounting
Notional amount						400.0
Receivables recognized					137,000,000
Gains recognized from receivables		3,000,000
Receivables recognized, Current					98,000,000
Receivables recognized, Non-current					39,000,000
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Minimum
Hedge accounting
Interest rate (as a percent)			208.70%
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Maximum
Hedge accounting
Interest rate (as a percent)			245.25%
NDF | Effective from March 15, 2017 and September 15, 2017 | Currency risk | Fair value hedges | Weighted average
Hedge accounting
Interest rate (as a percent)			222.58%
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					$ 100,000,000
Notional amount						$ 40.0
Number of Tranches | tranche				2	2
Receivables recognized					$ 18,000,000
Gains recognized from receivables		$ 4,000,000
Receivables recognized, Current					12,000,000
Receivables recognized, Non-current					$ 6,000,000
NDF | Maturing between February and April 2018 | Currency risk | Exchange rate hedges
Hedge accounting
Average exchange rate						18.30
NDF | Maturing between March and August 2018 | Currency risk | Exchange rate hedges
Hedge accounting
Notional amount						$ 6.3
Average exchange rate | $ / item						18.94
Net gain/loss			$ 22,000,000
2.1325% NDF | Effective from March 15, 2018 | Currency risk | Fair value hedges
Hedge accounting
Notional amount				$ 20.0
Interest rate (as a percent)			213.25%
2.085% NDF | Effective from March 15, 2018 | Currency risk | Fair value hedges
Hedge accounting
Notional amount						$ 20.0
Interest rate (as a percent)			208.50%

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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