FINANCIAL RISK MANAGEMENT, Fair Value Measurement Hierarchy and Estimates (Details) - ARS ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets at fair value [Abstract]
Other financial assets at fair value through profit or loss	$ 13,267,914	$ 3,201,152
Financial liabilities at fair value [Abstract]
Derivative financial instruments	42,265	0
Financial liabilities at carrying amount and estimated fair value [Abstract]
Carrying amount	60,178,193	72,401,664
2018 Note [Member]
Financial liabilities at fair value [Abstract]
Total	45,208,681	56,729,824
Financial liabilities at carrying amount and estimated fair value [Abstract]
Carrying amount	49,556,849	61,850,964
Fair Value	45,208,681	56,729,824
Fair Value [Member]
Financial assets at fair value [Abstract]
Cash and cash equivalents	4,208,552	4,794,383
Other financial assets at fair value through profit or loss	13,267,914	3,201,152
Total	17,476,466	7,995,535
Financial liabilities at fair value [Abstract]
Derivative financial instruments	42,265
Total	42,265
Financial liabilities at carrying amount and estimated fair value [Abstract]
Fair Value	42,265
Fair Value [Member] \| Level 1 [Member]
Financial assets at fair value [Abstract]
Cash and cash equivalents	4,208,552	4,794,383
Other financial assets at fair value through profit or loss	13,267,914	3,201,152
Total	17,476,466	7,995,535
Financial liabilities at fair value [Abstract]
Derivative financial instruments	42,265
Total	42,265
Financial liabilities at carrying amount and estimated fair value [Abstract]
Fair Value	42,265
Fair Value [Member] \| Level 2 [Member]
Financial assets at fair value [Abstract]
Cash and cash equivalents	0	0
Other financial assets at fair value through profit or loss	0	0
Total	0	0
Financial liabilities at fair value [Abstract]
Derivative financial instruments	0
Total	0
Financial liabilities at carrying amount and estimated fair value [Abstract]
Fair Value	0
Fair Value [Member] \| Level 3 [Member]
Financial assets at fair value [Abstract]
Cash and cash equivalents	0	0
Other financial assets at fair value through profit or loss	0	0
Total	0	$ 0
Financial liabilities at fair value [Abstract]
Derivative financial instruments	0
Total	0
Financial liabilities at carrying amount and estimated fair value [Abstract]
Fair Value	$ 0

The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

+ Details

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

- Definition

The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 8
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_FinancialAssetsAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

+ Details

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

- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

+ Details

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

- Definition

The amount of cash and cash equivalents measured at fair value.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=tgs_Two018NoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: