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PROPERTY, PLANT AND EQUIPMENT (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year [1] $ 34,160,708    
Depreciation 2,223,083 $ 2,020,216 $ 2,095,418
End of the year 38,685,519 34,160,708 [1]  
Financial Lease [Abstract]      
Cost-Capitalized financial leasing 1,429,713 1,429,713  
Accumulated depreciation (222,649) (130,518)  
Total $ 1,207,064 1,299,195  
Financial leasing agreement expiration date Sep. 30, 2026    
Pipelines [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 20,506,011    
End of the year 20,360,703 20,506,011  
Compressor Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 4,559,753    
End of the year 4,923,385 4,559,753  
Other Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 12,577    
End of the year 11,993 12,577  
Stations of Regulation and/or Measurement of Pressure [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 307,151    
End of the year 275,253 307,151  
Other Technical Installations [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 39,870    
End of the year 39,436 39,870  
Subtotal Assets Related to Natural Gas Transportation Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 25,425,362    
End of the year 25,610,770 25,425,362  
Assets Related to Natural Gas Upstream Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 2,159,431    
End of the year 1,905,509 2,159,431  
Assets Related to Liquids Production and Commercialization Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,071,726    
End of the year 1,374,855 1,071,726  
Lands [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 71,837    
End of the year 107,348 71,837  
Buildings and Constructions [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 837,467    
End of the year 882,731 837,467  
Fittings and Features in Building [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 98,503    
End of the year 102,917 98,503  
Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 117,547    
End of the year 231,087 117,547  
UT Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 0    
End of the year 145 0  
Computers and Telecommunication Systems [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 363,445    
End of the year 491,991 363,445  
Vehicles [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 72,062    
End of the year 87,527 72,062  
Furniture [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 5,434    
End of the year 4,701 5,434  
Materials [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,572,902    
End of the year 1,536,373 1,572,902  
Line Pack [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 135,749    
End of the year 358,222 135,749  
Works in Progress [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 2,229,243    
End of the year 5,991,343 2,229,243  
Cost [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 76,666,974 74,625,478  
Additions 6,906,410 2,296,641  
Retirements 2,510,862 255,145  
Transfers 0 0  
End of the year 81,062,522 76,666,974 74,625,478
Cost [Member] | Pipelines [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 39,112,667 38,613,449  
Additions 0 0  
Retirements 18,101 17,399  
Transfers 831,882 516,617  
End of the year 39,926,448 39,112,667 38,613,449
Cost [Member] | Compressor Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 14,541,520 14,181,525  
Additions 0 2,660  
Retirements 308,660 189,100  
Transfers 1,023,210 546,435  
End of the year 15,256,070 14,541,520 14,181,525
Cost [Member] | Other Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 17,219 17,219  
Additions 0 0  
Retirements 0 0  
Transfers 0 0  
End of the year 17,219 17,219 17,219
Cost [Member] | Stations of Regulation and/or Measurement of Pressure [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,360,656 1,350,336  
Additions 1,081 0  
Retirements 5,948 0  
Transfers 4,001 10,320  
End of the year 1,359,790 1,360,656 1,350,336
Cost [Member] | Other Technical Installations [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 264,962 259,919  
Additions 0 0  
Retirements 1,330 11,194  
Transfers 5,308 16,237  
End of the year 268,940 264,962 259,919
Cost [Member] | Subtotal Assets Related to Natural Gas Transportation Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 55,297,024 54,422,448  
Additions 1,081 2,660  
Retirements 334,039 217,693  
Transfers 1,864,401 1,089,609  
End of the year 56,828,467 55,297,024 54,422,448
Cost [Member] | Assets Related to Natural Gas Upstream Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 3,489,476 3,231,072  
Additions 5,971 0  
Retirements 197,269 2,815  
Transfers (32,913) 261,219  
End of the year 3,265,265 3,489,476 3,231,072
Cost [Member] | Assets Related to Liquids Production and Commercialization Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 7,030,019 6,839,452  
Additions 0 0  
Retirements 474,602 3,922  
Transfers 434,953 194,489  
End of the year 6,990,370 7,030,019 6,839,452
Cost [Member] | Lands [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 71,837 71,830  
Additions 35,511 7  
Retirements 0 0  
Transfers 0 0  
End of the year 107,348 71,837 71,830
Cost [Member] | Buildings and Constructions [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,985,027 1,945,894  
Additions 0 0  
Retirements 48,091 1,027  
Transfers 90,998 40,160  
End of the year 2,027,934 1,985,027 1,945,894
Cost [Member] | Fittings and Features in Building [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 165,920 165,425  
Additions 0 0  
Retirements 11,752 0  
Transfers 17,252 495  
End of the year 171,420 165,920 165,425
Cost [Member] | Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 513,762 430,019  
Additions 129,963 82,172  
Retirements 47,758 0  
Transfers 10,981 1,571  
End of the year 606,948 513,762 430,019
Cost [Member] | UT Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 0 0  
Additions 591 0  
Retirements 0 0  
Transfers 0 0  
End of the year 591 0 0
Cost [Member] | Computers and Telecommunication Systems [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 3,745,839 3,672,719  
Additions 168 0  
Retirements 1,355,581 0  
Transfers 325,263 73,120  
End of the year 2,715,689 3,745,839 3,672,719
Cost [Member] | Vehicles [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 263,745 235,191  
Additions 38,089 49,029  
Retirements 5,817 20,475  
Transfers 0 0  
End of the year 296,017 263,745 235,191
Cost [Member] | Furniture [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 148,460 148,206  
Additions 0 0  
Retirements 0 0  
Transfers 104 254  
End of the year 148,564 148,460 148,206
Cost [Member] | Materials [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,572,902 1,118,657  
Additions 572,326 514,263  
Retirements 35,953 9,213  
Transfers (572,902) (50,805)  
End of the year 1,536,373 1,572,902 1,118,657
Cost [Member] | Line Pack [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 153,720 153,720  
Additions 0 0  
Retirements 0 0  
Transfers 222,473 0  
End of the year 376,193 153,720 153,720
Cost [Member] | Works in Progress [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 2,229,243 2,190,845  
Additions 6,122,710 1,648,510  
Retirements 0 0  
Transfers (2,360,610) (1,610,112)  
End of the year 5,991,343 2,229,243 2,190,845
Depreciation [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 42,506,266 40,609,776  
Retirements 2,352,346 123,726  
Depreciation 2,223,083 2,020,216  
End of the year 42,377,003 42,506,266 40,609,776
Depreciation [Member] | Pipelines [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 18,606,656 17,678,180  
Retirements 300 63  
Depreciation $ 959,389 $ 928,539  
Depreciation rate % 2.20% 2.20%  
End of the year $ 19,565,745 $ 18,606,656 17,678,180
Depreciation [Member] | Compressor Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 9,981,767 9,508,571  
Retirements 278,943 102,860  
Depreciation 629,861 576,056  
End of the year $ 10,332,685 $ 9,981,767 9,508,571
Depreciation [Member] | Compressor Plants [Member] | Bottom of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 3.30% 3.30%  
Depreciation [Member] | Compressor Plants [Member] | Top of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 25.00% 25.00%  
Depreciation [Member] | Other Plants [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 4,642 $ 4,058  
Retirements 0 0  
Depreciation $ 584 $ 584  
Depreciation rate % 3.30% 3.30%  
End of the year $ 5,226 $ 4,642 4,058
Depreciation [Member] | Stations of Regulation and/or Measurement of Pressure [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,053,505 1,002,347  
Retirements 5,163 0  
Depreciation $ 36,195 $ 51,158  
Depreciation rate % 4.00% 4.00%  
End of the year $ 1,084,537 $ 1,053,505 1,002,347
Depreciation [Member] | Other Technical Installations [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 225,092 219,216  
Retirements 1,330 187  
Depreciation $ 5,742 $ 6,063  
Depreciation rate % 6.70% 6.70%  
End of the year $ 229,504 $ 225,092 219,216
Depreciation [Member] | Subtotal Assets Related to Natural Gas Transportation Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 29,871,662 28,412,372  
Retirements 285,736 103,110  
Depreciation 1,631,771 1,562,400  
End of the year 31,217,697 29,871,662 28,412,372
Depreciation [Member] | Assets Related to Natural Gas Upstream Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,330,045 1,123,382  
Retirements 177,846 100  
Depreciation 207,557 206,763  
End of the year $ 1,359,756 $ 1,330,045 1,123,382
Depreciation [Member] | Assets Related to Natural Gas Upstream Service [Member] | Bottom of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 3.30% 3.30%  
Depreciation [Member] | Assets Related to Natural Gas Upstream Service [Member] | Top of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 25.00% 25.00%  
Depreciation [Member] | Assets Related to Liquids Production and Commercialization Service [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 5,958,293 $ 5,878,107  
Retirements 440,455 36  
Depreciation $ 97,677 $ 80,222  
Depreciation rate % 3.30% 3.30%  
End of the year $ 5,615,515 $ 5,958,293 5,878,107
Depreciation [Member] | Lands [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 0 0  
Retirements 0 0  
Depreciation $ 0 $ 0  
Depreciation rate % 0.00% 0.00%  
End of the year $ 0 $ 0 0
Depreciation [Member] | Buildings and Constructions [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 1,147,560 1,112,381  
Retirements 38,159 5  
Depreciation $ 35,802 $ 35,184  
Depreciation rate % 2.00% 2.00%  
End of the year $ 1,145,203 $ 1,147,560 1,112,381
Depreciation [Member] | Fittings and Features in Building [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 67,417 60,396  
Retirements 6,123 0  
Depreciation $ 7,209 $ 7,021  
Depreciation rate % 4.00% 4.00%  
End of the year $ 68,503 $ 67,417 60,396
Depreciation [Member] | Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 396,215 382,173  
Retirements 47,588 0  
Depreciation 27,234 14,042  
End of the year $ 375,861 $ 396,215 382,173
Depreciation [Member] | Machinery, Equipment and Tools [Member] | Bottom of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 6.70% 6.70%  
Depreciation [Member] | Machinery, Equipment and Tools [Member] | Top of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 10.00% 10.00%  
Depreciation [Member] | UT Machinery, Equipment and Tools [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 0 $ 0  
Retirements 0 0  
Depreciation 446 0  
End of the year $ 446 $ 0 0
Depreciation [Member] | UT Machinery, Equipment and Tools [Member] | Bottom of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 6.70% 6.70%  
Depreciation [Member] | UT Machinery, Equipment and Tools [Member] | Top of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 10.00% 10.00%  
Depreciation [Member] | Computers and Telecommunication Systems [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 3,382,394 $ 3,286,123  
Retirements 1,350,936 0  
Depreciation 192,240 96,271  
End of the year $ 2,223,698 $ 3,382,394 3,286,123
Depreciation [Member] | Computers and Telecommunication Systems [Member] | Bottom of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 6.70% 6.70%  
Depreciation [Member] | Computers and Telecommunication Systems [Member] | Top of Range [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Depreciation rate % 20.00% 20.00%  
Depreciation [Member] | Vehicles [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year $ 191,683 $ 194,679  
Retirements 5,503 20,475  
Depreciation $ 22,310 $ 17,479  
Depreciation rate % 20.00% 20.00%  
End of the year $ 208,490 $ 191,683 194,679
Depreciation [Member] | Furniture [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 143,026 142,192  
Retirements 0 0  
Depreciation $ 837 $ 834  
Depreciation rate % 10.00% 10.00%  
End of the year $ 143,863 $ 143,026 142,192
Depreciation [Member] | Materials [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 0 0  
Retirements 0 0  
Depreciation $ 0 $ 0  
Depreciation rate % 0.00% 0.00%  
End of the year $ 0 $ 0 0
Depreciation [Member] | Line Pack [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 17,971 17,971  
Retirements 0 0  
Depreciation $ 0 $ 0  
Depreciation rate % 0.00% 0.00%  
End of the year $ 17,971 $ 17,971 17,971
Depreciation [Member] | Works in Progress [Member]      
Reconciliation of changes in property, plant and equipment [Abstract]      
Beginning of the year 0 0  
Retirements 0 0  
Depreciation $ 0 $ 0  
Depreciation rate % 0.00% 0.00%  
End of the year $ 0 $ 0 $ 0
[1] The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)