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DETAIL OF SIGNIFICANT STATEMENT OF FINANCIAL POSITION AND STATEMENT OF COMPREHENSIVE INCOME CAPTIONS, Taxes Payables (Details) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current [Abstract] |  |
Health and safety tax | $ 13,109 | $ 17,683
Withholdings and perceptions made to third parties | 89,189 | 201,559
Turnover Tax | 162,572 | 116,105
Tax on exports | 0 | 98,019
VAT | 69,244 | 0
UT Others | 0 | 464
Others | 14,360 | 46,995
Total | 348,474 | 480,825
Non-current [Abstract] |  |
Health and safety tax | 0 | 0
Withholdings and perceptions made to third parties | 0 | 0
Turnover Tax | 0 | 0
Tax on exports | 0 | 0
VAT | 0 | 0
UT Others | 0 | 0
Others | 0 | 0
Total | $ 0 | $ 0

X
- Definition Amount of current portion of tax payables related to health and safety. + References No definition available. + Details
Name: | tgs_CurrentHealthAndSafetyTax
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of current other tax payables. + References No definition available. + Details
Name: | tgs_CurrentOtherTaxPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of current tax payables related to exports. + References No definition available. + Details
Name: | tgs_CurrentTaxOnExports
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of current tax payables related to VAT. + References No definition available. + Details
Name: | tgs_CurrentTaxOnVAT
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of current tax payables. + References No definition available. + Details
Name: | tgs_CurrentTaxesPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Refers to amount of current tax payables related to turnover. + References No definition available. + Details
Name: | tgs_CurrentTurnoverTax
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other tax payables current, held for joint operation. + References No definition available. + Details
Name: | tgs_CurrentUTOtherTaxPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current portion of tax payables related to withholdings for income tax made to third parties. + References No definition available. + Details
Name: | tgs_CurrentWithholdingsForIncomeTaxMadeToThirdParties
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of non-current other tax payables. + References No definition available. + Details
Name: | tgs_NonCurrentOtherTaxPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of non-current portion of tax payables related to exports. + References No definition available. + Details
Name: | tgs_NonCurrentTaxOnExports
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of non-current portion of tax payables related to health and safety. + References No definition available. + Details
Name: | tgs_NonCurrentTaxOnHealthAndSafetyTax
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of non-current VAT. + References No definition available. + Details
Name: | tgs_NonCurrentTaxOnVAT
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to amount of non-current taxes payables. + References No definition available. + Details
Name: | tgs_NonCurrentTaxesPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | tgs_NonCurrentTaxesPayablesAbstract
Namespace Prefix: | tgs_
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X
- Definition Refers to amount of non-current tax payables related to turnover. + References No definition available. + Details
Name: | tgs_NonCurrentTurnoverTax
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other tax payables non-current, held for joint operation. + References No definition available. + Details
Name: | tgs_NonCurrentUTOtherTaxPayables
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of non-current portion of tax payables related to withholdings for income tax made to third parties. + References No definition available. + Details
Name: | tgs_NonCurrentWithholdingsForIncomeTaxMadeToThirdParties
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant