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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - ARS ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-cash Investing and Financing Activities [Abstract]
Unpaid acquisition of PPE		$ 307,746	$ 299,598	$ 47,198
Principal payment of financial lease	[1]	101,965	$ 66,075	271,843
Leasing for PPE acquisition		$ 0		$ 1,429,713
[1] Cancelled through compensation with trade receivables with the creditor. See Note 13.

X

- Definition

The amount of leasing for property, plant and equipment acquisition.

+ References

No definition available.

+ Details

Name:	tgs_LeasingOfPropertyPlantAndEquipmentAcquisition
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Refers to the principal payment of finance lease.

+ References

No definition available.

+ Details

Name:	tgs_PrincipalPaymentOfFinanceLease
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The unpaid amount for the acquisition of property, plant and equipment.

+ References

No definition available.

+ Details

Name:	tgs_UnpaidAcquisitionOfPropertyPlantAndEquipment
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration