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LOANS, Covenants and Financial leasing (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Bottom of Range [Member] |
Covenants [Abstract] |
Consolidated coverage ratio | 2.0
Top of Range [Member] |
Covenants [Abstract] |
Consolidated debt ratio | 3.75
Pampa Energia [Member] |
Financial Leasing [Abstract] |
Financial leasing agreement period | 10 years
Monthly payment amount | $ 623,457
Period of option to purchase financial leasing agreement for same amount | 120 months

X
- Definition Refers to the consolidated coverage ratio (calculated as the quotient of the consolidated adjusted EBITDA earnings before financial results, income tax, depreciation and amortization) and the consolidated interest expense. + References No definition available. + Details
Name: | tgs_ConsolidatedCoverageRatio
Namespace Prefix: | tgs_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the consolidated debt ratio (calculated as the quotient of the consolidated debt and the consolidated EBITDA). + References No definition available. + Details
Name: | tgs_ConsolidatedDebtRatio
Namespace Prefix: | tgs_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of the required periodic payments for a finance lease. + References No definition available. + Details
Name: | tgs_FinanceLeasePeriodicPaymentAmount
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Refers to the period for financial leasing agreement. + References No definition available. + Details
Name: | tgs_FinancialLeasingAgreementPeriod
Namespace Prefix: | tgs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the option to purchase financial leasing agreement for same amount. + References No definition available. + Details
Name: | tgs_PeriodOfOptionToPurchaseFinancialLeasingAgreementForSameAmount
Namespace Prefix: | tgs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_ConsolidatedStructuredEntitiesAxis=tgs_PampaEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |