The percentage of the entity's revenue. [Refer: Revenue]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The average life for refinanced new external indebtedness.

+ References

No definition available.

+ Details

Name:	tgs_AverageLifeForRefinancedNewExternalIndebtedness
Namespace Prefix:	tgs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to decrease in the amount of profit (loss) due to foreign exchange transaction.

+ References

No definition available.

+ Details

Name:	tgs_DecreaseInProfitLossBeforeTax
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

The number of working days to settle commitment in foreign exchange market.

+ References

No definition available.

+ Details

Name:	tgs_NumberOfWorkingDaysToSettleCommitmentInForeignExchangeMarket
Namespace Prefix:	tgs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the percentage increase (decrease) in US dollar rate against argentine peso.

+ References

No definition available.

+ Details

Name:	tgs_PercentageAppreciationDepreciationRateOfUSDollarAgainstArgentinePeso
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the percentage of funds denominated in US dollars to mitigate the foreign exchange risk.

+ References

No definition available.

+ Details

Name:	tgs_PercentageOfFundsDenominatedInUSDollars
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of principal amount maturing in period indicated.

+ References

No definition available.

+ Details

Name:	tgs_PercentageOfPrincipalAmountMaturingInPeriod
Namespace Prefix:	tgs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_SegmentsAxis=tgs_ProductionAndCommercializationOfLiquidsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_ARS
Namespace Prefix:
Data Type:	na
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FINANCIAL RISK MANAGEMENT, Foreign Exchange Risk (Details) - ARS ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign exchange risk [Abstract]
Number of working days to settle commitment in foreign exchange market	5 days
Percentage of principal amount maturing in maximum period	40.00%
Average life for refinanced new external indebtedness	2 years
Foreign Exchange Risk [Member]
Foreign exchange risk [Abstract]
Percentage of funds denominated in US dollars to mitigate foreign exchange risk	96.00%
Percentage appreciation (depreciation) of US Dollar against Argentine Peso	10.00%
Pretax income	$ 2,533,781	$ 3,491,865
U.S. Dollars [Member] \| Liquids Production and Commercialization [Member] \| Foreign Exchange Risk [Member]
Foreign exchange risk [Abstract]
Percentage of revenue	87.00%	87.00%
Argentine Pesos [Member] \| Liquids Production and Commercialization [Member] \| Foreign Exchange Risk [Member]
Foreign exchange risk [Abstract]
Percentage of revenue	50.00%	53.00%	59.00%