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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
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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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- References No definition available. + Details
Name: | tgs_LimitationOnTransferOfSharesAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to minimum acquired shareholding percentage by another investment entity. + References No definition available. + Details
Name: | tgs_MinimumAcquiredShareholdingPercentageByAnotherInvestmentEntity
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Refers to the number of shares invested by the entity during the period. + References No definition available. + Details
Name: | tgs_NumberOfSharesInvestmentByEntity
Namespace Prefix: | tgs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Refers to percentage of investment on total assets. + References No definition available. + Details
Name: | tgs_PercentageOfInvestmentOnTotalAssets
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of voting equity interests of the entity's common shares requiring unanimous approval of CIESA's shareholders. + References No definition available. + Details
Name: | tgs_PercentageOfVotingEquityInterestsSaleRequiringApproval
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tgs_OrdinarySharesClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |