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BALANCES AND TRANSACTIONS WITH RELATED COMPANIES (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
ARS ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2018
USD ($)
Aug. 08, 2017
ARS ($)
Technical, financial and operational assistance agreement [abstract]          
Compensation for key management member $ 83,820 $ 85,648 $ 79,094    
Balances and transactions with related parties [Abstract]          
Accounts receivable 348,112 36,437      
Accounts payable 1,856,506 1,467,632      
Costs [Abstract]          
Gas purchase and others 631,016 302,488 559,268    
Compensation for technical assistance 1,317,176 577,187 329,826    
Revenue for administrative services 146 2,269 244    
Financial Results [Abstract]          
Interest expenses 125,467 107,731 50,145    
Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 539,749 76,078 73,187    
Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 1,323 93,573 768,340    
Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 259,810 125,761 362,636    
Compania Mega S.A. [Member]          
Costs [Abstract]          
Gas purchase and others     0    
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
Compania Mega S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     3,325    
Compania Mega S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     176,841    
Compania Mega S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     35    
Braskem [Member]          
Costs [Abstract]          
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
Braskem [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Braskem [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     42,611    
Braskem [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Costs [Abstract]          
Gas purchase and others     4,361    
Petroleo Brasileiro [Member]          
Costs [Abstract]          
Gas purchase and others     0    
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
Petroleo Brasileiro [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Petroleo Brasileiro [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     546,476    
Petroleo Brasileiro [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Refinor S.A. [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 0 0      
Accounts payable 0 5,218      
Costs [Abstract]          
Gas purchase and others   5,350      
Compensation for technical assistance   0      
Revenue for administrative services   0      
Financial Results [Abstract]          
Interest expenses   0      
Refinor S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
Refinor S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
Refinor S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
Petrolera Pampa S.A. [Member]          
Costs [Abstract]          
Gas purchase and others   40,344 333,944    
Compensation for technical assistance   0 0    
Revenue for administrative services   0 0    
Financial Results [Abstract]          
Interest expenses   0 0    
Petrolera Pampa S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0 0    
Petrolera Pampa S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0 0    
Petrolera Pampa S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0 0    
SACDE [Member]          
Technical, financial and operational assistance agreement [abstract]          
Amount received for services 263,580        
Balances and transactions with related parties [Abstract]          
Accounts receivable 214,148 0      
Accounts payable 0 0      
Petrolera Entre Lomas S.A. [Member]          
Costs [Abstract]          
Gas purchase and others 2,017 [1] 17,801 50,356    
Compensation for technical assistance 0 [1] 0 0    
Revenue for administrative services 0 [1] 0 0    
Financial Results [Abstract]          
Interest expenses 0 [1] 0 0    
Petrolera Entre Lomas S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 [1] 0 0    
Petrolera Entre Lomas S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 [1] 0 0    
Petrolera Entre Lomas S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 [1] 0 350    
Pampa Comercializadora S.A. [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 7,113 2,779      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0 0 0    
Compensation for technical assistance 0 0 0    
Revenue for administrative services 0 0 0    
Financial Results [Abstract]          
Interest expenses 0 0 0    
Pampa Comercializadora S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 26,869 10,775 7,009    
Pampa Comercializadora S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
Pampa Comercializadora S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
Oleoductos del Valle S.A. [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 3,131 1,975      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0   0    
Compensation for technical assistance 0   0    
Revenue for administrative services 0   0    
Financial Results [Abstract]          
Interest expenses 0   0    
Oleoductos del Valle S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 6,149   4,715    
Oleoductos del Valle S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0   0    
Oleoductos del Valle S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 8,277   0    
Petrouruguay S.A. [Member]          
Costs [Abstract]          
Gas purchase and others     0    
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
Petrouruguay S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     722    
Petrouruguay S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     95    
Petrouruguay S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
WEB S.A. [Member]          
Costs [Abstract]          
Gas purchase and others     7,262    
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
WEB S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     220    
WEB S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
WEB S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Central Piedra Buena S.A. [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 25,463 7,661      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0        
Compensation for technical assistance 0        
Revenue for administrative services 0        
Financial Results [Abstract]          
Interest expenses 0        
Central Piedra Buena S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 67,175        
Central Piedra Buena S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0        
Central Piedra Buena S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0        
Central Temica Loma La Lata S.A. [Member]          
Costs [Abstract]          
Gas purchase and others   0      
Compensation for technical assistance   0      
Revenue for administrative services   0      
Financial Results [Abstract]          
Interest expenses   0      
Central Temica Loma La Lata S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
Central Temica Loma La Lata S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
Central Temica Loma La Lata S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   389      
Central Termica Piedrabuena S.A. [Member]          
Costs [Abstract]          
Gas purchase and others     0    
Compensation for technical assistance     0    
Revenue for administrative services     0    
Financial Results [Abstract]          
Interest expenses     0    
Central Termica Piedrabuena S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     14,162    
Central Termica Piedrabuena S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Central Termica Piedrabuena S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues     0    
Transener S.A. [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 91 44      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0        
Compensation for technical assistance 0        
Revenue for administrative services 0        
Financial Results [Abstract]          
Interest expenses 0        
Transener S.A. [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0        
Transener S.A. [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0        
Transener S.A. [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 12,014        
Experta ART [Member]          
Costs [Abstract]          
Gas purchase and others 11,910 11,949 0    
Compensation for technical assistance 0 0 0    
Revenue for administrative services 0 0 0    
Financial Results [Abstract]          
Interest expenses 0 0 0    
Experta ART [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
Experta ART [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
Experta ART [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
Link [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 6,482 768      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0   0    
Compensation for technical assistance 0   0    
Revenue for administrative services 0   0    
Financial Results [Abstract]          
Interest expenses 0   0    
Link [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0   0    
Link [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0   0    
Link [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 8,589   7,787    
EGS [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 0 0      
Accounts payable 0 679      
TGU [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 0 0      
Accounts payable $ 6,001 4,383      
CTG [Member]          
Technical, financial and operational assistance agreement [abstract]          
Cash payments for acquisition         $ 148
Pampa Energia [Member]          
Technical, financial and operational assistance agreement [abstract]          
Technical assistance agreement term renewal 3 years        
Percentage of annual comprehensive profits for providing operation and maintenance services 7.00%        
Balances and transactions with related parties [Abstract]          
Accounts receivable [2] $ 91,684 23,152      
Accounts payable 1,850,505 [2] 1,457,352 [2]   $ 3.0  
Financial lease 1,655,409 1,316,061      
Costs [Abstract]          
Gas purchase and others 617,089 227,044 163,345    
Compensation for technical assistance 1,317,176 577,187 329,826    
Revenue for administrative services 0 0 0    
Financial Results [Abstract]          
Interest expenses 125,467 107,731 50,145    
Pampa Energia [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 439,556 44,683 43,034    
Pampa Energia [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 1,323 93,573 2,317    
Pampa Energia [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 230,930 116,186 354,464    
UT [Member]          
Costs [Abstract]          
Gas purchase and others   0      
Compensation for technical assistance   0      
Revenue for administrative services   2,115      
Financial Results [Abstract]          
Interest expenses   0      
UT [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
UT [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
UT [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues   0      
CIESA [Member]          
Balances and transactions with related parties [Abstract]          
Accounts receivable 0 58      
Accounts payable 0 0      
Costs [Abstract]          
Gas purchase and others 0 0 0    
Compensation for technical assistance 0 0 0    
Revenue for administrative services 146 154 244    
Financial Results [Abstract]          
Interest expenses 0 0 0    
CIESA [Member] | Natural Gas Transportation [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
CIESA [Member] | Production and Commercialization of Liquids [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues 0 0 0    
CIESA [Member] | Other Services [Member]          
Detail of Significant Transactions with Related Parties [abstract]          
Revenues $ 0 $ 0 $ 0    
[1] As from April 2018, Petrolera Entre Lomas S.A is no longer a related party
[2] Accounts payable includes Ps. 1,655,409 and Ps. 1,316,061 corresponding to the financial leasing recorded as "Loans" as of December 31, 2018 and 2017, respectively.