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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Non-cash Investing and Financing Activities [Abstract] |  |  |  |
Unpaid acquisition of PPE |  | $ 304,531 | $ 1,812,174 | $ 644,507
Principal payment of financial lease | [1] | 190,969 | 203,173 | 213,551
Capitalization of finance costs |  | $ 0 | $ 607,452 | $ 0
[1] | Cancelled through compensation with trade receivables with the creditor. See Note 13.

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- Definition Finance cost capitalized during period. + 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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- 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 Refers to the principal payment of finance lease. + References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The unpaid amount for the acquisition of property, plant and equipment. + References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration