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SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] - ARS ($) $ in Millions	Apr. 20, 2021	Apr. 01, 2021
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: