The number of shares issued by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

- 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

- Definition

The amount of shares authorized for repurchase under a share repurchase program.

+ References

No definition available.

+ Details

Name:	tgs_ShareRepurchaseProgramAuthorizedAmount
Namespace Prefix:	tgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period which shares may be purchased under a share repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The total number of shares repurchased and held in treasury as a percentage of the total share capital of the entity.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_TreasurySharesMember
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:

SUBSEQUENT EVENTS (Details) - ARS ($) $ in Thousands					12 Months Ended
SUBSEQUENT EVENTS (Details) - ARS ($) $ in Thousands	Apr. 24, 2020	Apr. 21, 2020	Mar. 06, 2020	Nov. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 19, 2019	Aug. 26, 2019	Mar. 27, 2019
Subsequent Event [Abstract]
Maximum amount approved for treasury shares repurchase program							$ 4,000,000	$ 3,200,000	$ 1,500,000
Shares repurchase program term					120 days
Treasury Shares [Member]
Subsequent Event [Abstract]
Shares issued (in shares)					9,886,755	13,600,780
Percentage of total common stock representing shares repurchased				3.706%	1.24%	1.71%
Subsequent events [Member]
Subsequent Event [Abstract]
Maximum amount approved for treasury shares repurchase program			$ 2,500,000
Shares repurchase program term			180 days
Increase in legal reserve		$ 690,192
Reserve for capital expenditures, acquisition of treasury shares and dividends		$ 19,756,710
Subsequent events [Member] \| Treasury Shares [Member]
Subsequent Event [Abstract]
Shares issued (in shares)	30,856,815
Percentage of total common stock representing shares repurchased	3.88%