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LOANS, Maturities of Current and Non-current Loans (Details) $ in Thousands	Dec. 31, 2017 ARS ($)
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.

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No definition available.

+ Details

Name:	tgs_BorrowingsNetOfIssuanceCost
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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

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- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
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: