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LOANS, Maturities of Current and Non-current Loans (Details) $ in Thousands	Dec. 31, 2018 ARS ($)
Maturities of current and non-current loans [Abstract]
Current and non-current loans excluding issuance cost	$ 19,062,063
Less than 1 year [Member]
Maturities of current and non-current loans [Abstract]
Current and non-current loans excluding issuance cost	212,063
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	0
From 01/01/2021 to 12/31/2021 [Member]
Maturities of current and non-current loans [Abstract]
Current and non-current loans excluding issuance cost	0
From 1/01/2022 onwards [Member]
Maturities of current and non-current loans [Abstract]
Current and non-current loans excluding issuance cost	$ 18,850,000

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- Definition

The amount of outstanding funds that the entity is obligated to repay net of issuance cost.

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No definition available.

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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.

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Namespace Prefix:	tgs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
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Data Type:	na
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- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
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