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BUSINESS DESCRIPTION, Economic Context (Details) - Argentina [Member] | 12 Months Ended
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Dec. 31, 2020
Economic Context [Abstract] |
Emerging Markets Bonds Index | 13.68%
Cumulative inflation rate | 36.10%
Impact of COVID-19 ("COVID") on TGS operations [Abstract] |
Suspension of public service cuts for non-payment | 180 days
Drop in natural gas production | 9.00%
U.S. Dollars [Member] |
Economic Context [Abstract] |
Depreciation of peso against U.S. dollar | (41.00%)
Alternative Currencies [Member] |
Economic Context [Abstract] |
Exchange rate gap | 70.00%

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- Definition Drop in the company's natural gas production year-on-year. + References No definition available. + Details
Name: | tgs_DropInNaturalGasProduction
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Emerging markets bond index (EMBI) is a benchmark index for measuring the total return performance of international government and corporate bonds issued by emerging market countries that meet specific liquidity and structural requirements. + References No definition available. + Details
Name: | tgs_EmergingMarketsBondsIndex
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The foreign exchange rate gap within the entity's country of origin related to currency outflows that persistently exceed currency inflows. + References No definition available. + Details
Name: | tgs_ForeignExchangeRateGap
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | tgs_ImpactOfCOVID19OnOperationsAbstract
Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total percentage increase or (decrease) in the exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References No definition available. + Details
Name: | tgs_IncreaseDecreaseInForeignExchangeRate
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cumulative rate of inflation per the Consumer Price Index ("CPI"). + References No definition available. + Details
Name: | tgs_InflationRateCumulative
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Suspension of public service cuts for non-payment ordered by Argentine government. + References No definition available. + Details
Name: | tgs_SuspensionOfPublicServiceCutsForNonPayment
Namespace Prefix: | tgs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=tgs_CurrencyOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |