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FINANCIAL RISK MANAGEMENT, Credit Risk, Trade and Other Receivables (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Trade and other receivables [abstract] |  |  |  |  |
Current trade receivables | $ 2,033,540 |  | $ 1,246,142 |  |
Non-current trade receivables | 3,055 |  | 8,122 |  |
Allowance for doubtful accounts | 0 | [1] | (19,703) | [1] | $ (1,389)
Revenues | 12,246,664 |  | 7,402,172 |  | 4,226,569
Trade receivables | 2,036,595 |  | 1,234,561 |  |
Natural Gas Transportation [Member] | MetroGas [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 1,188,059 |  | 597,041 |  | 268,626
Trade receivables | 209,426 |  | 70,319 |  |
Natural Gas Transportation [Member] | Camuzzi Gas Pampeana S.A. [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 873,176 |  | 358,756 |  | 154,209
Trade receivables | 153,163 |  | 51,908 |  |
Natural Gas Transportation [Member] | Gas Natural BAN S.A. ("BAN") [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 627,356 |  | 268,043 |  | 110,259
Trade receivables | 116,946 |  | 38,635 |  |
Natural Gas Transportation [Member] | CAMMESA [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 545,023 |  | 335,751 |  | 0
Trade receivables | 157,252 |  | 16,920 |  |
Natural Gas Transportation [Member] | Pampa Energia [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 28,643 |  | 27,353 |  | 27,681
Trade receivables | 882 |  | 5,943 |  |
Natural Gas Transportation [Member] | Camuzzi Gas del Sur S.A. [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 192,200 |  | 58,056 |  | 36,614
Trade receivables | 31,372 |  | 50,001 |  |
Liquids Production and Commercialization [Member] | Polisur [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 2,226,179 |  | 1,949,460 |  | 1,298,152
Trade receivables | 352,632 |  | 223,938 |  |
Liquids Production and Commercialization [Member] | Petredec [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 910,633 |  | 0 |  | 254,061
Trade receivables | 293,890 |  | 0 |  |
Liquids Production and Commercialization [Member] | Petroleo Brasileiro [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 62,254 |  | 513,912 |  | 95,618
Trade receivables | 0 |  | 57,335 |  |
Liquids Production and Commercialization [Member] | Petrobras Global [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 0 |  | 0 |  | 44,058
Trade receivables | 0 |  | 0 |  |
Liquids Production and Commercialization [Member] | Braskem Netherlands B.V. [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 0 |  | 19,706 |  | 135,971
Trade receivables | 0 |  | 0 |  |
Liquids Production and Commercialization [Member] | Trafigura Beheer B.V. [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 0 |  | 0 |  | 159,911
Trade receivables | 0 |  | 0 |  |
Liquids Production and Commercialization [Member] | Geogas Trading S.A. [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 324,540 |  | 460,234 |  | 112,392
Trade receivables | 54,014 |  | 125,303 |  |
Liquids Production and Commercialization [Member] | Shell Trading (US) Company [Member] |  |  |  |  |
Trade and other receivables [abstract] |  |  |  |  |
Revenues | 892,086 |  | 0 |  | $ 0
Trade receivables | $ 0 |  | $ 0 |  |
[1] | Corresponds to the best estimate made by TGS according to what is mentioned in note 5.b.

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