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BUSINESS DESCRIPTION, Economic Context (Details) - Argentina [Member]	12 Months Ended
	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%

X

- 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

X

- References

No definition available.

+ Details

Name:	tgs_EconomicContextAbstract
Namespace Prefix:	tgs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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