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v3.21.1

PROPERTY, PLANT AND EQUIPMENT, Right-of-use Assets (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Other Services and Production and Commercialization of Liquids Segments [Abstract] |  |
Right-of-use assets | $ 1,953,218 | $ 2,297,903
Book value Variation of Rights-of Use [Abstract] |  |
Depreciation, right-of-use assets | (344,685) | (344,686)
Other Plants [Member] |  |
Other Services and Production and Commercialization of Liquids Segments [Abstract] |  |
Right-of-use assets | 518,778 | 610,326
Book value Variation of Rights-of Use [Abstract] |  |
Depreciation, right-of-use assets | (91,549) | (91,549)
Compressor Plants [Member] |  |
Other Services and Production and Commercialization of Liquids Segments [Abstract] |  |
Right-of-use assets | 1,287,986 | 1,515,277
Book value Variation of Rights-of Use [Abstract] |  |
Depreciation, right-of-use assets | (227,292) | (227,292)
Other Technical Installations [Member] |  |
Other Services and Production and Commercialization of Liquids Segments [Abstract] |  |
Right-of-use assets | 146,454 | 172,300
Book value Variation of Rights-of Use [Abstract] |  |
Depreciation, right-of-use assets | $ (25,844) | $ (25,845)

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_OtherPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_CompressorPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_OtherTechnicalInstallationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |