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LOANS, Maturities of Current and Non-current Loans (Details) $ in Thousands | Dec. 31, 2017 ARS ($)
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Maturities of current and non-current loans [Abstract] |
Current and non-current loans excluding issuance cost | $ 3,615,918
Less than 1 year [Member] |
Maturities of current and non-current loans [Abstract] |
Current and non-current loans excluding issuance cost | 1,233,966
From 01/01/2019 to 12/31/2019 [Member] |
Maturities of current and non-current loans [Abstract] |
Current and non-current loans excluding issuance cost | 1,190,976
From 01/01/2020 to 12/31/2020 [Member] |
Maturities of current and non-current loans [Abstract] |
Current and non-current loans excluding issuance cost | $ 1,190,976

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- Definition The amount of outstanding funds that the entity is obligated to repay net of issuance cost. + 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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- 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |