The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_CurrentGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of income recognised in relation to government grants. [Refer: Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2018-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=20&date=2018-03-01&anchor=para_39_b&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_RevenueFromGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents amount of each dollar of the tax base or the official FOB price.

+ References

No definition available.

+ Details

Name:	tgs_AmountOfEachDollarOfTheTaxBaseOrTheOfficialFOBPrice
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Refers to the amount of compensation received from national government per ton.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Refers to the increases in price of different types of household bottles per ton.

+ References

No definition available.

+ Details

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

- Definition

Refers to the amount of increase in price of propane gas per ton used for the propane for networks agreement.

+ References

No definition available.

+ Details

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

- Definition

Refers to the amount of increase in price of propane gas per ton used depending on the customer to whom the product is intended.

+ References

No definition available.

+ Details

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

- Definition

The percentage of export duty levied on the goods passing through a customs area with a rout to another country.

+ References

No definition available.

+ Details

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

- Definition

Refers to the tariff charge paid per cubic meter in accordance with the provisions of resolution.

+ References

No definition available.

+ Details

Name:	tgs_TariffChargePaidPerCubicMeter
Namespace Prefix:	tgs_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the amount of natural gas processing tariff charge per cubic meter.

+ References

No definition available.

+ Details

Name:	tgs_TariffChargePerCubicMeter
Namespace Prefix:	tgs_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_ButaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_PropaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgs_NaturalGasolineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REGULATORY FRAMEWORK, Regulatory Framework for Non-Regulated Segments (Details)							3 Months Ended	12 Months Ended
	Jan. 28, 2019 ARS ($)	Mar. 27, 2018 ARS ($)	Dec. 01, 2017 ARS ($)	Apr. 01, 2017 ARS ($)	Dec. 01, 2011 $ / m³	Nov. 30, 2011 $ / m³	Mar. 31, 2017 ARS ($)	Dec. 31, 2018 ARS ($) $ / m³	Dec. 31, 2017 ARS ($)	Dec. 31, 2016 ARS ($)	Sep. 03, 2018 USD ($)
Domestic market [Abstract]
Increase in price of household bottles per ton							$ 650,000			$ 650,000
Increase in price of propane gas per ton									$ 1,267,000
Increase in price of propane gas per ton depending on customer									2,832,000
Subsidies booked								$ 406,727,000	347,655,000	314,028,000
Subsidies receivable from government								292,866,000	255,886,000
Compensation received from government per ton								$ 550,000
Foreign market [Abstract]
Capped amount of each dollar of the tax base or the official FOB price											$ 4
Tariff charge paid (per cubic meter) \| $ / m³								0.0492
Tariff charge (per cubic meter) \| $ / m³					0.405	0.049
Production and Commercialization of Liquids [Member]
Domestic market [Abstract]
Subsidies booked								$ 406,727,000	347,655,000	$ 314,028,000
Butane [Member]
Domestic market [Abstract]
Increase in price of household bottles per ton		$ 5,416,000	$ 4,302,000	$ 2,568,000
Foreign market [Abstract]
Export duty percentage											12.00%
Butane [Member] \| Subsequent events [Member]
Domestic market [Abstract]
Increase in price of household bottles per ton	$ 9,154,000
Propane [Member]
Domestic market [Abstract]
Increase in price of household bottles per ton		$ 5,502,000	$ 4,290,000	$ 2,410,000
Increase in price of propane gas per ton									1,941,200
Increase in price of propane gas per ton depending on customer									$ 3,694,000
Foreign market [Abstract]
Export duty percentage											12.00%
Propane [Member] \| Subsequent events [Member]
Domestic market [Abstract]
Increase in price of household bottles per ton	$ 9,042,000
Natural Gasoline [Member]
Foreign market [Abstract]
Export duty percentage											12.00%