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SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 ARS ($) shares | Dec. 31, 2016 ARS ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2015 ARS ($) shares
Associates [Abstract] |  |  |  |  |
Investment in associates |  | $ 3,065 | $ 2,874 |  |
Foreign currency translation [Abstract] |  |  |  |  |
Term of cumulative rate of inflation |  | 3 years |  |  |
Maximum percentage of cumulative rate of inflation |  | 100.00% |  | 100.00% |
Property, plant and equipment [Abstract] |  |  |  |  |
Property, plant and equipment from privatization of GdE |  | $ 6,480,361 | 5,333,344 |  | $ 4,219,520
Financial expense capitalized |  | 48,975 | 39,736 |  |
Income tax and deferred income tax [Abstract] |  |  |  |  |
Provisions for income taxes |  | $ 0 | 0 |  |
Tax on minimum presumed income [Abstract] |  |  |  |  |
Statutory tax rate on TOMPI |  | 1.00% |  |  |
Term of carry forward period for excess income tax |  | 10 years |  |  |
Income tax payables, offsetting balance |  |  | $ 71,405 |  |
Equity accounts [Abstract] |  |  |  |  |
Percentage of legal reserve of net income |  | 5.00% |  |  |
Percentage of legal reserve on sum of Capital stock and Adjustment to capital stock balances |  | 20.00% |  |  |
Earnings per share [abstract] |  |  |  |  |
Number of ordinary shares outstanding (in shares) | shares |  | 794,495,283 | 794,495,283 | 794,495,283 | 794,495,283
Top of Range [Member] |  |  |  |  |
Associates [Abstract] |  |  |  |  |
Associates' percentage of voting rights |  | 50.00% |  |  |
Shareholding and voting |  | 50.00% |  |  |
Bottom of Range [Member] |  |  |  |  |
Associates [Abstract] |  |  |  |  |
Associates' percentage of voting rights |  | 20.00% |  |  |
Shareholding and voting |  | 20.00% |  |  |
GdE [member] |  |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |  |
Percentage of common stock considered for assets value |  | 70.00% |  | 70.00% |
Value of assets, price paid on common stock from privatization of GdE |  |  |  | $ 561.2 |
Value of common stock from provatization of GdE |  |  |  | 801.7 |
Debt assumed from privatization of GdE |  |  |  | 395.0 |
Property, plant and equipment from privatization of GdE |  |  |  | $ 1,196.7 |
Telcosur [Member] |  |  |  |  |
Subsidiary [Abstract] |  |  |  |  |
Company |  | Telcosur |  |  |
Shareholding and votes |  | 99.98% |  |  |
Country |  | Argentina |  |  |
Main Activity |  | Telecommunication services |  |  |
Closing date |  | December 31 |  |  |
CTG [Member] |  |  |  |  |
Subsidiary [Abstract] |  |  |  |  |
Company | [1] | CTG |  |  |
Shareholding and votes |  | 100.00% |  |  |
Country |  | Argentina |  |  |
Main Activity |  | Electricity related services |  |  |
Closing date |  | December 31 |  |  |
TGU [Member] |  |  |  |  |
Associates [Abstract] |  |  |  |  |
Associates' percentage of voting rights |  | 49.00% |  |  |
Investment in associates |  | $ 2,698 | $ 2,517 |  |
Company |  | TGU |  |  |
Shareholding and voting |  | 49.00% |  |  |
Country |  | Uruguay |  |  |
Main activity |  | Pipeline maintenance |  |  |
Closing date |  | December 31 |  |  |
EGS [Member] |  |  |  |  |
Associates [Abstract] |  |  |  |  |
Associates' percentage of voting rights |  | 49.00% |  |  |
Adjusted valuation of investments |  |  | 2,289 |  |
Investment in associates |  | $ 367 | 357 |  |
Company |  | EGS (“in liquidation”) |  |  |
Shareholding and voting |  | 49.00% |  |  |
Country |  | Argentina |  |  |
Main activity |  | Pipeline exploitation and construction |  |  |
Closing date |  | December 31 |  |  |
Link [Member] |  |  |  |  |
Associates [Abstract] |  |  |  |  |
Associates' percentage of voting rights |  | 49.00% |  |  |
Investment in associates |  | $ 0 | $ 0 |  |
Company |  | Link |  |  |
Shareholding and voting |  | 49.00% |  |  |
Country |  | Argentina |  |  |
Main activity |  | Pipeline exploitation and construction |  |  |
Closing date |  | December 31 |  |  |
[1] | This company was acquired on August 8, 2017.

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