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COMMON STOCK AND DIVIDENDS, Limitation on the transfer of the TGS' shares (Details) - shares	Dec. 31, 2017	Dec. 31, 2016	Jul. 22, 2016
Limitation on transfer of shares [Abstract]
Sale covers percentage of common stock	51.00%
Minimum acquired shareholding percentage by another investment company	51.00%
FGS [Member] | Bottom of Range [Member]
Limitation on transfer of shares [Abstract]
Percentage of investment on total assets			7.00%
FGS [Member] | Top of Range [Member]
Limitation on transfer of shares [Abstract]
Percentage of investment on total assets			50.00%
FGS [Member] | Class "B" [Member]
Limitation on transfer of shares [Abstract]
Number of shares invested by the FGS (in shares)		183,618,632

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- Definition

Refers to minimum acquired shareholding percentage by another investment entity.

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No definition available.

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Name:	tgs_MinimumAcquiredShareholdingPercentageByAnotherInvestmentEntity
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Refers to the number of shares invested by the entity during the period.

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No definition available.

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Name:	tgs_NumberOfSharesInvestmentByEntity
Namespace Prefix:	tgs_
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Balance Type:	na
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- Definition

Refers to percentage of investment on total assets.

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No definition available.

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Name:	tgs_PercentageOfInvestmentOnTotalAssets
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

The percentage of voting equity interests of the entity's common shares requiring unanimous approval of CIESA's shareholders.

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No definition available.

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Name:	tgs_PercentageOfVotingEquityInterestsSaleRequiringApproval
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
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Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
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- Details

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