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DETAIL OF SIGNIFICANT STATEMENT OF FINANCIAL POSITION AND STATEMENT OF COMPREHENSIVE INCOME CAPTIONS, Expenses by Nature (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | $ 1,912,950 |  | $ 1,791,444 |  | $ 1,603,431 |
Social security taxes | 320,232 |  | 308,469 |  | 276,390 |
Compensation to Directors and Supervisory Committee | 25,819 |  | 13,816 |  | 12,345 |
Professional services fees | 274,697 |  | 99,599 |  | 80,706 |
Technical operator assistance fees | 1,317,176 |  | 577,187 |  | 329,826 |
Materials | 223,940 |  | 97,057 |  | 85,497 |
Third parties services | 261,779 |  | 206,456 |  | 183,154 |
Telecommunications and post expenses | 21,776 |  | 16,093 |  | 9,766 |
Rents | 24,786 |  | 10,939 |  | 6,818 |
Transports and freight | 68,094 |  | 57,869 |  | 54,541 |
Easements | 54,076 |  | 35,265 |  | 38,326 |
Offices supplies | 6,997 |  | 5,612 |  | 5,159 |
Travels expenses | 85,273 |  | 31,035 |  | 19,533 |
Insurance | 66,269 |  | 52,660 |  | 51,962 |
Property, plant and equipment maintenance | 1,265,254 |  | 1,005,258 |  | 408,504 |
Depreciation of property, plant and equipment | 2,223,083 |  | 2,020,216 |  | 2,095,419 |
Taxes and contributions | 1,675,901 |  | 918,821 |  | 703,136 |
Advertising | 4,856 |  | 767 |  | 737 |
Doubtful accounts | 132,521 |  | (23,395) | [1] | 38,142 | [1]
Banks expenses | 12,150 |  | 7,217 |  | 4,054 |
Interests expense | 1,675,437 |  | 846,366 |  | 937,454 |
Foreign exchange loss | 13,122,031 |  | 1,117,201 |  | 1,486,399 |
Other financial charges | 243,524 |  | 167,920 |  | 131,536 |
Derivative financial instruments results | 0 |  | 0 |  | 9,383 |
Costs of services rendered to third parties | 165,277 |  | 115,272 |  | 84,207 |
Other expenses | 88,000 |  | 57,794 |  | 57,581 |
Total | 25,271,898 |  | 9,536,938 |  | 8,714,006 |
Tax on exports | 248,883 |  | 1,286 |  | 11,081 |
Operating Expenses, Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 891,140 |  | 864,168 |  | 796,925 |
Social security taxes | 144,748 |  | 135,826 |  | 128,245 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 7,047 |  | 2,409 |  | 2,580 |
Technical operator assistance fees | 838,032 |  | 260,036 |  | 105,950 |
Materials | 68,688 |  | 29,979 |  | 28,376 |
Third parties services | 102,315 |  | 85,959 |  | 72,598 |
Telecommunications and post expenses | 4,196 |  | 2,150 |  | 553 |
Rents | 7,657 |  | 3,161 |  | 1,658 |
Transports and freight | 42,231 |  | 34,450 |  | 33,904 |
Easements | 54,076 |  | 35,265 |  | 38,326 |
Offices supplies | 2,371 |  | 1,665 |  | 1,843 |
Travels expenses | 38,173 |  | 13,879 |  | 9,582 |
Insurance | 38,167 |  | 30,744 |  | 29,666 |
Property, plant and equipment maintenance | 1,105,531 |  | 865,572 |  | 294,447 |
Depreciation of property, plant and equipment | 1,612,884 |  | 1,569,839 |  | 1,527,999 |
Taxes and contributions | 170,521 |  | 213,123 |  | 160,122 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 0 |  | 0 |  | 0 |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Other financial charges | 0 |  | 0 |  | 0 |
Derivative financial instruments results |  |  |  |  | 0 |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other expenses | 36,501 |  | 30,640 |  | 26,900 |
Total | 5,164,278 |  | 4,178,865 |  | 3,259,674 |
Operating Expenses, Non Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 567,798 |  | 469,199 |  | 393,027 |
Social security taxes | 84,940 |  | 80,500 |  | 66,702 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 135,626 |  | 4,931 |  | 7,002 |
Technical operator assistance fees | 479,144 |  | 317,151 |  | 223,876 |
Materials | 155,252 |  | 67,078 |  | 57,121 |
Third parties services | 130,258 |  | 103,408 |  | 95,078 |
Telecommunications and post expenses | 2,857 |  | 1,972 |  | 2,211 |
Rents | 10,301 |  | 1,581 |  | 737 |
Transports and freight | 22,984 |  | 19,772 |  | 19,347 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 861 |  | 585 |  | 737 |
Travels expenses | 26,740 |  | 5,113 |  | 2,764 |
Insurance | 23,695 |  | 17,527 |  | 18,242 |
Property, plant and equipment maintenance | 144,116 |  | 129,280 |  | 102,080 |
Depreciation of property, plant and equipment | 342,706 |  | 325,104 |  | 210,876 |
Taxes and contributions | 20,082 |  | 13,395 |  | 17,320 |
Advertising | 0 |  | 3 |  | 0 |
Doubtful accounts | 0 |  | 0 |  | 0 |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Other financial charges | 0 |  | 0 |  | 0 |
Derivative financial instruments results |  |  |  |  | 0 |
Costs of services rendered to third parties | 165,277 |  | 115,272 |  | 84,207 |
Other expenses | 27,477 |  | 13,545 |  | 11,608 |
Total | 2,340,114 |  | 1,685,416 |  | 1,312,935 |
Administrative Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 356,913 |  | 357,902 |  | 321,349 |
Social security taxes | 69,616 |  | 70,258 |  | 61,543 |
Compensation to Directors and Supervisory Committee | 25,819 |  | 13,816 |  | 12,345 |
Professional services fees | 125,232 |  | 83,979 |  | 64,122 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 19,790 |  | 17,089 |  | 15,478 |
Telecommunications and post expenses | 14,258 |  | 11,196 |  | 6,818 |
Rents | 5,946 |  | 5,442 |  | 4,054 |
Transports and freight | 2,879 |  | 3,614 |  | 1,290 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 3,130 |  | 2,618 |  | 2,395 |
Travels expenses | 16,396 |  | 8,991 |  | 5,344 |
Insurance | 4,404 |  | 3,909 |  | 3,501 |
Property, plant and equipment maintenance | 15,607 |  | 8,639 |  | 9,766 |
Depreciation of property, plant and equipment | 267,493 |  | 125,273 |  | 356,544 |
Taxes and contributions | 2,128 |  | 1,186 |  | 1,474 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 0 |  | 0 |  | 0 |
Banks expenses | 12,150 |  | 7,217 |  | 4,054 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Other financial charges | 0 |  | 0 |  | 0 |
Derivative financial instruments results |  |  |  |  | 0 |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other expenses | 20,052 |  | 12,745 |  | 10,690 |
Total | 961,813 |  | 733,874 |  | 880,767 |
Selling Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 97,099 |  | 100,175 |  | 92,130 |
Social security taxes | 20,928 |  | 21,885 |  | 19,900 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 6,792 |  | 8,280 |  | 7,002 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 9,416 |  | 0 |  | 0 |
Telecommunications and post expenses | 465 |  | 775 |  | 184 |
Rents | 882 |  | 755 |  | 369 |
Transports and freight | 0 |  | 33 |  | 0 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 635 |  | 744 |  | 184 |
Travels expenses | 3,964 |  | 3,052 |  | 1,843 |
Insurance | 3 |  | 480 |  | 553 |
Property, plant and equipment maintenance | 0 |  | 1,767 |  | 2,211 |
Depreciation of property, plant and equipment | 0 |  | 0 |  | 0 |
Taxes and contributions | 1,483,170 | [2] | 691,117 | [3] | 524,220 | [4]
Advertising | 4,856 |  | 764 |  | 737 |
Doubtful accounts | 132,521 |  | (23,395) |  | 38,142 |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Other financial charges | 0 |  | 0 |  | 0 |
Derivative financial instruments results |  |  |  |  | 0 |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other expenses | 3,970 |  | 864 |  | 8,383 |
Total | 1,764,701 |  | 807,296 |  | 695,858 |
Financial Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 0 |  | 0 |  | 0 |
Social security taxes | 0 |  | 0 |  | 0 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 0 |  | 0 |  | 0 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 0 |  | 0 |  | 0 |
Telecommunications and post expenses | 0 |  | 0 |  | 0 |
Rents | 0 |  | 0 |  | 0 |
Transports and freight | 0 |  | 0 |  | 0 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 0 |  | 0 |  | 0 |
Travels expenses | 0 |  | 0 |  | 0 |
Insurance | 0 |  | 0 |  | 0 |
Property, plant and equipment maintenance | 0 |  | 0 |  | 0 |
Depreciation of property, plant and equipment | 0 |  | 0 |  | 0 |
Taxes and contributions | 0 |  | 0 |  | 0 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 0 |  | 0 |  | 0 |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 1,675,437 |  | 846,366 |  | 937,454 |
Foreign exchange loss | 13,122,031 |  | 1,117,201 |  | 1,486,399 |
Other financial charges | 243,524 |  | 167,920 |  | 131,536 |
Derivative financial instruments results |  |  |  |  | 9,383 |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other expenses | 0 |  | 0 |  | 0 |
Total | $ 15,040,992 |  | $ 2,131,487 |  | $ 2,564,772 |
[1] | The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)
[2] | Includes tax on exports for Ps. 248,883 for the year ended December 31, 2018.
[3] | Includes tax on exports for Ps. 1,286 for the year ended December 31, 2017
[4] | Includes tax on exports of Ps. 11,081 for the year ended December 31, 2016.

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- Definition The amount of expense arising from costs of services rendered to third parties. + References No definition available. + Details
Name: | tgs_CostsOfServicesRenderedToThirdParties
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of relating to expenses on derivative financial instruments. + References No definition available. + Details
Name: | tgs_DerivativeFinancialInstrumentsExpenses
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from easements. + References No definition available. + Details
Name: | tgs_EasementsExpense
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from office supplies. + References No definition available. + Details
Name: | tgs_OfficesSupplies
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of social security taxes expense. + References No definition available. + Details
Name: | tgs_SocialSecurityTaxes
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of tax expense on exports. + References No definition available. + Details
Name: | tgs_TaxOnExports
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenses for technical operator assistance fees in related party transactions. + References No definition available. + Details
Name: | tgs_TechnicalOperatorAssistanceFeesRelatedPartyTransactions
Namespace Prefix: | tgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=tgs_OperatingExpensesRegulatedActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=tgs_OperatingExpensesNonRegulatedActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=tgs_AdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=tgs_SellingExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=tgs_FinancialExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |