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DETAIL OF SIGNIFICANT STATEMENT OF FINANCIAL POSITION AND STATEMENT OF COMPREHENSIVE INCOME CAPTIONS, Contract Liabilities (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Current liabilities [abstract] |  |
Contract liabilities | $ 219,801 | $ 199,333
Non Current liabilities [abstract] |  |
Contract liabilities | 2,926,826 | 2,259,876
Revenue recognized from contracts with customers | 139,207 | 182,784
IFRS 15 [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities |  | 199,333
Non Current liabilities [abstract] |  |
Contract liabilities |  | 2,259,876
Natural Gas Transportation [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities | 98,460 |
Non Current liabilities [abstract] |  |
Contract liabilities | 1,744,944 |
Natural Gas Transportation [Member] | IFRS 15 [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities |  | 104,572
Non Current liabilities [abstract] |  |
Contract liabilities |  | 1,844,227
Production and Commercialization of Liquids [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities | 38,387 |
Non Current liabilities [abstract] |  |
Contract liabilities | 341,698 |
Production and Commercialization of Liquids [Member] | IFRS 15 [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities |  | 39,249
Non Current liabilities [abstract] |  |
Contract liabilities |  | 392,388
Other Services [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities | 62,386 |
Non Current liabilities [abstract] |  |
Contract liabilities | 840,184 |
Other Services [Member] | IFRS 15 [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities |  | 3,104
Non Current liabilities [abstract] |  |
Contract liabilities |  | 23,261
UT [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities | 20,568 |
Non Current liabilities [abstract] |  |
Contract liabilities | $ 0 |
UT [Member] | IFRS 15 [Member] |  |
Current liabilities [abstract] |  |
Contract liabilities |  | 52,408
Non Current liabilities [abstract] |  |
Contract liabilities |  | $ 0

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- Definition The amount of current contract liabilities. [Refer: Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount of non-current contract liabilities. [Refer: Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_NoncurrentLiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 116 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_b&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | ifrs-full_SegmentsAxis=tgs_NaturalGasTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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