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CRITICAL ACCOUNTING ESTIMATES AND JUDGMENTS (Details)	12 Months Ended
	Dec. 31, 2019
CRITICAL ACCOUNTING ESTIMATES AND JUDGMENTS [Abstract]
Increase percentage points in weighted probability of pessimistic case	70.00%
Minimum percentage points in weighted probability of pessimistic case	30.00%
Maximum percentage points in weighted probability of pessimistic case	100.00%

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- Definition

The accounting estimate for the maximum percentage points in the weighted probability of the pessimistic case would not generate a value that would require an adjustment in carrying amount for impairment.

+ References

No definition available.

+ Details

Name:	tgs_AccountingEstimateMaximumPercentagePointsInWeightedProbabilityOfPessimisticCase
Namespace Prefix:	tgs_
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Period Type:	duration

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- Definition

The accounting estimate for the minimum percentage points in the weighted probability of the pessimistic case would not generate a value that would require an adjustment in carrying amount for impairment.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	tgs_CriticalAccountingEstimatesAndJudgmentsAbstract
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- Definition

The increase in the accounting estimate for the percentage points in the weighted probability of the pessimistic case would not generate a value that would require an adjustment in carrying amount for impairment.

+ References

No definition available.

+ Details

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