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REGULATORY FRAMEWORK, Regulatory Framework for Non-Regulated Segments (Details)
$ in Millions
 12 Months Ended
Dec. 01, 2017
ARS ($)
Apr. 26, 2017
ARS ($)
Apr. 01, 2017
ARS ($)
Dec. 01, 2011
$ / m³
Nov. 30, 2011
$ / m³
Dec. 31, 2017
ARS ($)
$ / m³
Dec. 31, 2016
ARS ($)
Oct. 05, 2016
USD ($)
May 20, 2016
ARS ($)
Apr. 01, 2015
kg
Domestic market [Abstract]                    
Weight of LPG bottles under Households Bottles Program, one (in kilos) | kg                   10
Weight of LPG bottles under Households Bottles Program, two (in kilos) | kg                   12
Weight of LPG bottles under Households Bottles Program, three (in kilos) | kg                   15
Interest rate on bonds issued in US dollars                 8.00%  
Expiration of bonds issued in US dollars           2020        
Cancellation of compensation amount                 $ 140,496,000  
Original nominal value               $ 8.0    
Subsidies receivable from government           $ 173,311,000 $ 156,399,000      
Compensation received for participation in propane   $ 91,578,000       216,100,000        
Increase in price of propane gas per ton           1,267        
Increase in price of propane gas per ton depending on customer           2,832        
Changes in property, plant and equipment [abstract]                    
Compensation received from government per ton           $ 550        
Tariff charge paid (per cubic meter) | $ / m³           0.0492        
Tariff charge (per cubic meter) | $ / m³       0.405 0.049          
Butane [Member]                    
Changes in property, plant and equipment [abstract]                    
Increase in price of household bottles per ton $ 4,302   $ 2,568              
Propane [Member]                    
Changes in property, plant and equipment [abstract]                    
Increase in price of household bottles per ton $ 4,290   $ 2,410