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SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] - ARS ($) $ in Millions | Apr. 20, 2021 | Apr. 01, 2021
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Subsequent Event [Abstract] |  |
Increase in legal reserve | $ 186 |
Reserve for capital expenditures, acquisition of treasury shares and dividends | $ 31,709 |
Transitory rate increase |  | 58.60%

X
- Definition Amount of increase in legal reserve approved by the ordinary shareholders. + References No definition available. + Details
Name: | tgs_IncreaseInLegalReserve
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of increase in a transitory tariff rate. + References No definition available. + Details
Name: | tgs_PercentageOfIncreaseInTransitoryTariffsRate
Namespace Prefix: | tgs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of reserve for capital expenditures, share repurchase and dividend payments. + References No definition available. + Details
Name: | tgs_ReserveForCapitalExpendituresShareRepurchaseAndDividendPayment
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=tgs_SubsequentEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |