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REGULATORY FRAMEWORK, General Framework of the Natural Gas Transportation Segment (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Dec. 31, 2005
Proposal
Apr. 01, 2018
Dec. 01, 2017
Apr. 02, 2017
Mar. 30, 2017
Feb. 24, 2016
ARS ($)
Jun. 05, 2015
Aug. 01, 2014
Jun. 01, 2014
Apr. 07, 2014
Apr. 01, 2014
Oct. 09, 2008
May 22, 2007
USD ($)
General aspects [Abstract]                                
Original license period 35 years                              
License period, renewal 10 years                              
License period, after renewal 45 years                              
Tariff situation [Abstract]                                
Natural gas transportation tariffs period, condition one semi-annually                              
Natural gas transportation tariffs period, condition two 5 years                              
Conversion rate of exchange for tariffs 1                              
Transitional Agreement [Abstract]                                
Number of proposals | Proposal       2                        
Percentage of increase in tariff                     20.00% 14.00%   8.00% 20.00%  
Authorized percentage of increase in tariff                         20.00%      
Percentage of increase in tariff on service for natural gas transportation           80.80% 64.20% 214.20%   44.30%            
Percentage of increase in tariff on access and use           29.70% 0.00% 37.00%   73.20%            
Percentage of tariff increase on public service of Natural Gas Transportation and CAU                 200.10%              
2016 Investment Plan nominal value                 $ 794,300              
Extended period of RTI process 1 year                              
Investment plan period 5 years                              
Five Year Plan investment amount $ 6,786,543                              
Percentage of amount of investment plan 10.00%                              
Acquisition of the Rights of Arbitration Proceedings [Abstract]                                
Award to claimants                               $ 106.2
Acquisition of rights of arbitration proceeding $ 0 $ 0 $ (324,390)                          
Subsequent Event [Member]                                
Transitional Agreement [Abstract]                                
Percentage of tariff increase on public service of Natural Gas Transportation and CAU         50.00%