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COMMON STOCK AND DIVIDENDS, Acquisition of treasury shares (Details) - ARS ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 06, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Acquisition of treasury shares [Abstract] |  |  |  |
Maximum amount invested for Shares Repurchase Program |  | $ 1,800,000 | $ 1,700,000 |
Shares Repurchase Program term | 180 days |  |  |
Shares Repurchase Program expiration date | Mar. 05, 2019 |  |  |
Treasury Shares [Member] |  |  |  |
Acquisition of treasury shares [Abstract] |  |  |  |
Shares issued (in shares) | 13,600,780 |  |  | 0
Percentage of total common stock representing shares repurchased | 1.71% |  |  |
Acquisition cost restated to inflation amount | $ 1,420,926 |  |  |

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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 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | tgs_
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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
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- Definition Expiration date for the purchase of an entity's own shares under a share repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:dateItemType
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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
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Balance Type: | na
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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
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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: |
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