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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-cash Investing and Financing Activities [Abstract] |  |  |  |
Unpaid acquisition of PPE |  | $ 307,746 | $ 299,598 | $ 47,198
Principal payment of financial lease | [1] | 101,965 | $ 66,075 | 271,843
Leasing for PPE acquisition |  | $ 0 |  | $ 1,429,713
[1] | Cancelled through compensation with trade receivables with the creditor. See Note 13.

X
- Definition The amount of leasing for property, plant and equipment acquisition. + References No definition available. + Details
Name: | tgs_LeasingOfPropertyPlantAndEquipmentAcquisition
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | tgs_NoncashInvestingAndFinancingActivitiesAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the principal payment of finance lease. + References No definition available. + Details
Name: | tgs_PrincipalPaymentOfFinanceLease
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The unpaid amount for the acquisition of property, plant and equipment. + References No definition available. + Details
Name: | tgs_UnpaidAcquisitionOfPropertyPlantAndEquipment
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration