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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - ARS ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 13, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Non-cash Investing and Financing Activities [Abstract] |  |  |  |  |
Unpaid acquisition of PPE |  |  | $ 1,331,105 | $ 473,413 | $ 460,879
Principal payment of financial lease | [1] |  | 149,238 | 156,861 | 101,645
Capitalization of finance costs |  |  | $ 446,195 | $ 0 | $ 0
Treasury Shares [Member] |  |  |  |  |
Non-cash Investing and Financing Activities [Abstract] |  |  |  |  |
Market value of treasury shares |  | $ 3,228,002 |  |  |
[1] | Cancelled through compensation with trade receivables with the creditor. See Note 13.

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- Definition Finance cost capitalized during period. + References No definition available. + Details
Name: | tgs_CapitalizationOfFinanceCosts
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of market value of treasury shares. + References No definition available. + Details
Name: | tgs_MarketValueOfTreasuryShares
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- 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

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- 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

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_TreasurySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |