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BALANCES AND TRANSACTIONS WITH RELATED COMPANIES (Details) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 ARS ($) | Dec. 31, 2019 ARS ($) | Dec. 31, 2018 ARS ($) | Dec. 31, 2020 USD ($)
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Compensation for key management member |  | $ 138,368 |  | $ 193,478 |  | $ 175,542 |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 414,974 |  | 412,237 |  |  |
Accounts payable |  | 2,936,370 |  | 3,402,209 |  |  |
Other receivables |  | 84,236 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 185,496 |  | 811,312 |  | 1,321,525 |
Compensation for technical assistance |  | 1,430,462 |  | 1,558,506 |  | 2,758,540 |
Revenue for administrative services |  | 140 |  | 199 |  | 306 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 242,337 |  | 265,398 |  | 262,764 |
Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 984,036 |  | 1,337,578 |  | 1,130,388 |
Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 1,049,966 |  | 366,914 |  | 2,770 |
Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 643,492 |  | 385,365 |  | 544,116 |
SACDE [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Amount received for services |  | 481,065 |  | 2,350,271 |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable | [1] | 0 |  | 31,781 |  |  |
Accounts payable | [1] | 0 |  | 0 |  |  |
CT Barragan S.A. [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 1,793 |  | 11,070 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Petrolera Entre Lomas S.A. [Member] |  |  |  |  |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  |  |  | 4,224 |
Compensation for technical assistance |  | 0 |  |  |  | 0 |
Revenue for administrative services |  | 0 |  |  |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  |  |  | 0 |
Petrolera Entre Lomas S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 2,475 |  |  |  | 0 |
Petrolera Entre Lomas S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  |  |  | 0 |
Petrolera Entre Lomas S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 8,934 |  |  |  | 0 |
Pampa Comercializadora S.A. [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 6,951 |  | 59,688 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  | 0 |  | 0 |
Compensation for technical assistance |  | 0 |  | 0 |  | 0 |
Revenue for administrative services |  | 0 |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  | 0 |  | 0 |
Pampa Comercializadora S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 112,774 |  | 70,863 |  | 56,271 |
Pampa Comercializadora S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Pampa Comercializadora S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Oleoductos del Valle S.A. [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 0 |  | 4,558 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  | 0 |  | 0 |
Compensation for technical assistance |  | 0 |  | 0 |  | 0 |
Revenue for administrative services |  | 0 |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  | 0 |  | 0 |
Oleoductos del Valle S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 25,768 |  | 7,446 |  | 12,878 |
Oleoductos del Valle S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Oleoductos del Valle S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 17,335 |
Central Piedra Buena S.A. [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 0 |  | 18,114 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  |  |  |  |
Compensation for technical assistance |  | 0 |  |  |  |  |
Revenue for administrative services |  | 0 |  |  |  |  |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  |  |  |  |
Central Piedra Buena S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 1,745 |  |  |  |  |
Central Piedra Buena S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  |  |  |  |
Central Piedra Buena S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  |  |  |  |
Central Termica Piedrabuena S.A. [Member] |  |  |  |  |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  |  |  | 0 |  | 0 |
Compensation for technical assistance |  |  |  | 0 |  | 0 |
Revenue for administrative services |  |  |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  |  |  | 0 |  | 0 |
Central Termica Piedrabuena S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  |  |  | 165,230 |  | 140,684 |
Central Termica Piedrabuena S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  |  |  | 0 |  | 0 |
Central Termica Piedrabuena S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  |  |  | 0 |  | 0 |
Transener S.A. [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 30 |  | 0 |  |  |
Accounts payable |  | 33 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  |  |  | 0 |
Compensation for technical assistance |  | 0 |  |  |  | 0 |
Revenue for administrative services |  | 0 |  |  |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  |  |  | 0 |
Transener S.A. [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  |  |  | 0 |
Transener S.A. [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  |  |  | 0 |
Transener S.A. [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 352 |  |  |  | 25,160 |
Experta ART [Member] |  |  |  |  |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 25,429 |  | 27,337 |  | 24,942 |
Compensation for technical assistance |  | 0 |  | 0 |  | 0 |
Revenue for administrative services |  | 0 |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  | 0 |  | 0 |
Experta ART [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Experta ART [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Experta ART [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Link [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 4,121 |  | 909 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  | 0 |  | 0 |
Compensation for technical assistance |  | 0 |  | 0 |  | 0 |
Revenue for administrative services |  | 0 |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  | 0 |  | 0 |
Link [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Link [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
Link [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 19,562 |  | 19,159 |  | 17,988 |
TGU [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 0 |  | 0 |  |  |
Accounts payable |  | 13,394 |  | 12,980 |  |  |
Pampa Energia [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable | [2] | 402,079 |  | 286,067 |  |  |
Accounts payable |  | 2,922,943 | [2] | 3,389,229 | [2] |  | $ 0.5
Other receivables |  | 84,236 |  |  |  |  |
Financial lease |  | 2,892,682 |  | 3,236,657 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 160,067 |  | 783,975 |  | 1,292,359 |
Compensation for technical assistance |  | 1,430,462 |  | 1,558,506 |  | 2,758,540 |
Revenue for administrative services |  | 0 |  | 0 |  | 0 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | $ 242,337 |  | 265,398 |  | 262,764 |
Pampa Energia [Member] | From 12/28/2019 to 12/27/2020 [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Percentage of annual comprehensive income before results and income taxes |  | 6.50% |  |  |  |  |
Pampa Energia [Member] | From 12/28/2020 to 12/27/2021 [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Percentage of annual comprehensive income before results and income taxes |  | 6.00% |  |  |  |  |
Pampa Energia [Member] | From 12/28/2021 to 12/27/2022 [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Percentage of annual comprehensive income before results and income taxes |  | 5.50% |  |  |  |  |
Pampa Energia [Member] | From 12/28/2022 to 12/27/2023 [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Percentage of annual comprehensive income before results and income taxes |  | 5.00% |  |  |  |  |
Pampa Energia [Member] | From 12/28/2023 to 12/27/2024 and onwards [Member] |  |  |  |  |  |  |
Technical, financial and operational assistance agreement [abstract] |  |  |  |  |  |  |
Percentage of annual comprehensive income before results and income taxes |  | 4.50% |  |  |  |  |
Pampa Energia [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | $ 841,274 |  | 1,094,039 |  | 920,555 |
Pampa Energia [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 1,049,966 |  | 366,914 |  | 2,770 |
Pampa Energia [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 614,644 |  | 366,206 |  | 483,633 |
CIESA [Member] |  |  |  |  |  |  |
Balances and transactions with related parties [Abstract] |  |  |  |  |  |  |
Accounts receivable |  | 0 |  | 50 |  |  |
Accounts payable |  | 0 |  | 0 |  |  |
Costs [Abstract] |  |  |  |  |  |  |
Gas purchase and others |  | 0 |  | 0 |  | 0 |
Compensation for technical assistance |  | 0 |  | 0 |  | 0 |
Revenue for administrative services |  | 140 |  | 199 |  | 306 |
Financial Results [Abstract] |  |  |  |  |  |  |
Interest expenses |  | 0 |  | 0 |  | 0 |
CIESA [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
CIESA [Member] | Production and Commercialization of Liquids [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | 0 |  | 0 |  | 0 |
CIESA [Member] | Other Services [Member] |  |  |  |  |  |  |
Detail of Significant Transactions with Related Parties [abstract] |  |  |  |  |  |  |
Revenues |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | Corresponds to advance payments delivered to the supplier recorded as "Other credits".
[2] | Accounts receivables includes Ps. 84,236 recorded as "Other receivables" as of December 31, 2020. Accounts payable includes Ps. 2,892,682 and Ps. 3,236,657 corresponding to the financial leasing recorded as "Loans" as of December 31, 2020 and 2019, respectively.

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Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Refers to percentage of annual comprehensive profit for providing operation and maintenance services. + 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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- References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expenses for technical operator assistance fees in related party transactions. + 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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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: |
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: |
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: |
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: |
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: |
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: |
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: |