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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
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | $ 1,104,770 |  | $ 814,731 |  | $ 564,489 |
Social security taxes | 188,424 |  | 139,356 |  | 98,812 |
Compensation to Directors and Supervisory Committee | 8,455 |  | 6,328 |  | 5,379 |
Professional services fees | 61,786 |  | 41,392 |  | 25,025 |
Technical operator assistance fees | 354,518 |  | 168,008 |  | 52,481 |
Materials | 59,949 |  | 43,205 |  | 29,113 |
Third parties services | 128,072 |  | 94,185 |  | 51,604 |
Telecommunications and post expenses | 9,936 |  | 5,177 |  | 4,161 |
Rents | 6,827 |  | 3,219 |  | 2,619 |
Transports and freight | 35,514 |  | 27,614 |  | 19,506 |
Easements | 21,490 |  | 19,315 |  | 15,003 |
Offices supplies | 3,450 |  | 2,679 |  | 1,508 |
Travels expenses | 19,325 |  | 9,972 |  | 8,279 |
Insurance | 32,262 |  | 26,509 |  | 22,850 |
Property, plant and equipment maintenance | 640,468 |  | 209,257 |  | 137,814 |
Depreciation of property, plant and equipment | 358,420 |  | 286,798 |  | 261,393 |
Taxes and contributions | 566,058 |  | 355,446 |  | 261,712 |
Advertising | 479 |  | 584 |  | 154 |
Doubtful accounts | (12,055) |  | 20,546 |  | 0 |
Banks expenses | 4,438 |  | 2,120 |  | 1,430 |
Interests expense | 469,325 |  | 431,561 |  | 320,428 |
Foreign exchange loss | 717,234 |  | 711,822 |  | 1,164,585 |
Other financial charges | 103,586 |  | 66,392 |  | 41,718 |
Derivative financial instruments results | 0 |  | 8,933 |  | 0 |
Costs of services rendered to third parties | 69,059 |  | 40,453 |  | 26,375 |
Transactions among business segments | 0 |  | 0 |  | 0 |
Other expenses | 35,580 |  | 28,136 |  | 17,486 |
Total | 4,987,370 |  | 3,563,738 |  | 3,133,924 |
Tax on exports | 700 |  | 11,081 |  | 61,057 |
Operating Expenses, Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 530,892 |  | 403,546 |  | 295,429 |
Social security taxes | 82,847 |  | 64,518 |  | 46,067 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 1,504 |  | 1,434 |  | 563 |
Technical operator assistance fees | 160,095 |  | 54,128 |  | 3,000 |
Materials | 18,602 |  | 14,153 |  | 10,545 |
Third parties services | 52,922 |  | 37,014 |  | 20,161 |
Telecommunications and post expenses | 1,323 |  | 342 |  | 445 |
Rents | 1,980 |  | 722 |  | 516 |
Transports and freight | 21,124 |  | 17,020 |  | 12,484 |
Easements | 21,490 |  | 19,315 |  | 15,003 |
Offices supplies | 1,041 |  | 917 |  | 531 |
Travels expenses | 8,643 |  | 4,832 |  | 4,069 |
Insurance | 18,848 |  | 15,048 |  | 12,935 |
Property, plant and equipment maintenance | 554,602 |  | 150,923 |  | 105,054 |
Depreciation of property, plant and equipment | 219,245 |  | 190,031 |  | 184,251 |
Taxes and contributions | 131,187 |  | 80,365 |  | 60,094 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 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 |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Transactions among business segments | (150,388) |  | (71,079) |  | (21,435) |
Other expenses | 19,206 |  | 13,908 |  | 8,512 |
Total | 1,695,163 |  | 997,137 |  | 758,224 |
Operating Expenses, Non Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 289,732 |  | 200,403 |  | 121,264 |
Social security taxes | 49,461 |  | 33,944 |  | 19,839 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 3,055 |  | 3,645 |  | 1,124 |
Technical operator assistance fees | 194,423 |  | 113,880 |  | 49,481 |
Materials | 41,347 |  | 29,052 |  | 18,568 |
Third parties services | 63,530 |  | 49,257 |  | 25,429 |
Telecommunications and post expenses | 1,217 |  | 1,087 |  | 778 |
Rents | 962 |  | 252 |  | 367 |
Transports and freight | 12,056 |  | 9,846 |  | 6,634 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 368 |  | 305 |  | 239 |
Travels expenses | 3,174 |  | 1,550 |  | 1,290 |
Insurance | 10,724 |  | 9,330 |  | 8,280 |
Property, plant and equipment maintenance | 80,590 |  | 52,100 |  | 28,791 |
Depreciation of property, plant and equipment | 112,693 |  | 47,928 |  | 66,734 |
Taxes and contributions | 7,943 |  | 8,927 |  | 4,999 |
Advertising | 3 |  | 0 |  | 0 |
Doubtful accounts | 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 |  | 0 |  |  |
Costs of services rendered to third parties | 69,059 |  | 40,453 |  | 26,375 |
Transactions among business segments | 150,388 |  | 71,079 |  | 21,435 |
Other expenses | 8,433 |  | 5,962 |  | 4,376 |
Total | 1,099,158 |  | 679,000 |  | 406,003 |
Administrative Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 222,528 |  | 163,999 |  | 114,577 |
Social security taxes | 42,825 |  | 30,874 |  | 25,962 |
Compensation to Directors and Supervisory Committee | 8,455 |  | 6,328 |  | 5,379 |
Professional services fees | 52,109 |  | 32,657 |  | 21,139 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 10,519 |  | 7,914 |  | 6,014 |
Telecommunications and post expenses | 6,912 |  | 3,405 |  | 2,714 |
Rents | 3,407 |  | 2,099 |  | 1,615 |
Transports and freight | 2,314 |  | 709 |  | 381 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 1,589 |  | 1,223 |  | 634 |
Travels expenses | 5,613 |  | 2,742 |  | 2,285 |
Insurance | 2,413 |  | 1,771 |  | 1,279 |
Property, plant and equipment maintenance | 5,276 |  | 5,065 |  | 3,262 |
Depreciation of property, plant and equipment | 26,482 |  | 48,839 |  | 10,408 |
Taxes and contributions | 719 |  | 728 |  | 524 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 0 |  | 0 |  |  |
Banks expenses | 4,438 |  | 2,120 |  | 1,430 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Other financial charges | 0 |  | 0 |  | 0 |
Derivative financial instruments results | 0 |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Transactions among business segments | 0 |  | 0 |  | 0 |
Other expenses | 7,396 |  | 4,906 |  | 4,033 |
Total | 402,995 |  | 315,379 |  | 201,636 |
Selling Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 61,618 |  | 46,783 |  | 33,219 |
Social security taxes | 13,291 |  | 10,020 |  | 6,944 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 5,118 |  | 3,656 |  | 2,199 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 1,101 |  | 0 |  | 0 |
Telecommunications and post expenses | 484 |  | 343 |  | 224 |
Rents | 478 |  | 146 |  | 121 |
Transports and freight | 20 |  | 39 |  | 7 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 452 |  | 234 |  | 104 |
Travels expenses | 1,895 |  | 848 |  | 635 |
Insurance | 277 |  | 360 |  | 356 |
Property, plant and equipment maintenance | 0 |  | 1,169 |  | 707 |
Depreciation of property, plant and equipment | 0 |  | 0 |  | 0 |
Taxes and contributions | 426,209 | [1] | 265,426 | [2] | 196,095 | [3]
Advertising | 476 |  | 584 |  | 154 |
Doubtful accounts | (12,055) |  | 20,546 |  |  |
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 |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Transactions among business segments | 0 |  | 0 |  | 0 |
Other expenses | 545 |  | 3,360 |  | 565 |
Total | 499,909 |  | 353,514 |  | 241,330 |
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 |  |  |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 469,325 |  | 431,561 |  | 320,428 |
Foreign exchange loss | 717,234 |  | 711,822 |  | 1,164,585 |
Other financial charges | 103,586 |  | 66,392 |  | 41,718 |
Derivative financial instruments results | 0 |  | 8,933 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Transactions among business segments | 0 |  | 0 |  | 0 |
Other expenses | 0 |  | 0 |  | 0 |
Total | $ 1,290,145 |  | $ 1,218,708 |  | $ 1,526,731 |
[1] | Includes tax on exports of Ps. 700 for year ended December 31, 2017.
[2] | Includes tax on exports of Ps . 11,081 for the year ended December 31, 2016.
[3] | Includes tax on exports of Ps . 61,057 for the year ended December 31, 2015.

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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
- Definition The amount of expense arising from transactions among business segments. + References No definition available. + Details
Name: | tgs_TransactionsAmongBusinessSegments
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: |