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SUBSEQUENT EVENTS (Details) - ARS ($) $ in Thousands |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 24, 2020 | Apr. 21, 2020 | Mar. 06, 2020 | Nov. 13, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 19, 2019 | Aug. 26, 2019 | Mar. 27, 2019
Subsequent Event [Abstract] |  |  |  |  |  |  |  |  |
Maximum amount approved for treasury shares repurchase program |  |  |  |  |  |  | $ 4,000,000 | $ 3,200,000 | $ 1,500,000
Shares repurchase program term |  |  |  |  | 120 days |  |  |  |
Treasury Shares [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [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% |  |  |
Subsequent events [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Abstract] |  |  |  |  |  |  |  |  |
Maximum amount approved for treasury shares repurchase program |  |  | $ 2,500,000 |  |  |  |  |  |
Shares repurchase program term |  |  | 180 days |  |  |  |  |  |
Increase in legal reserve |  | $ 690,192 |  |  |  |  |  |  |
Reserve for capital expenditures, acquisition of treasury shares and dividends |  | $ 19,756,710 |  |  |  |  |  |  |
Subsequent events [Member] | Treasury Shares [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Abstract] |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 30,856,815 |  |  |  |  |  |  |  |
Percentage of total common stock representing shares repurchased | 3.88% |  |  |  |  |  |  |  |

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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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- Definition Amount of increase in legal reserve approved by the ordinary shareholders. + References No definition available. + Details
Name: | tgs_IncreaseInLegalReserve
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of reserve for capital expenditures, share repurchase and dividend payments. + References No definition available. + Details
Name: | tgs_ReserveForCapitalExpendituresShareRepurchaseAndDividendPayment
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of shares authorized for repurchase under a share repurchase program. + References No definition available. + Details
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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
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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_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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