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COMMON STOCK AND DIVIDENDS, Acquisition of treasury shares (Details) - ARS ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 13, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 19, 2019 | Aug. 26, 2019 | Mar. 27, 2019
Acquisition of treasury shares [Abstract] |  |  |  |  |  |
Maximum amount invested for shares repurchase program |  |  |  | $ 4,000,000 | $ 3,200,000 | $ 1,500,000
Shares repurchase program term |  | 120 days |  |  |  |
Treasury Shares [Member] |  |  |  |  |  |
Acquisition of treasury shares [Abstract] |  |  |  |  |  |
Shares issued (in shares) |  | 9,886,755 | 13,600,780 |  |  |
Percentage of total common stock representing shares repurchased | 3.706% | 1.24% | 1.71% |  |  |
Acquisition cost of treasury shares | $ 4,045,739 | $ 730,764 | $ 2,185,845 |  |  |

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | tgs_AcquisitionOfTreasurySharesAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
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- Definition The amount of shares authorized for repurchase under a share repurchase program. + References No definition available. + Details
Name: | tgs_ShareRepurchaseProgramAuthorizedAmount
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Period which shares may be purchased under a share repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | tgs_ShareRepurchaseProgramPeriodInForce
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The total number of shares repurchased and held in treasury as a percentage of the total share capital of the entity. + References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cost related to the repurchase of treasury shares. + References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |