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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | $ 4,050,804 |  | $ 4,347,500 |  | $ 4,006,260 |
Social security taxes | 823,941 |  | 810,188 |  | 670,656 |
Compensation to Directors and Supervisory Committee | 40,039 |  | 44,284 |  | 54,072 |
Professional services fees | 316,283 |  | 657,734 |  | 575,292 |
Technical operator assistance fees | 1,430,462 |  | 1,558,506 |  | 2,758,540 |
Materials | 453,037 |  | 527,916 |  | 468,994 |
Third parties services | 518,110 |  | 593,395 |  | 548,240 |
Telecommunications and post expenses | 47,420 |  | 61,003 |  | 45,605 |
Rents | 25,197 |  | 59,572 |  | 51,909 |
Transports and freight | 156,729 |  | 157,904 |  | 142,608 |
Easements | 98,444 |  | 125,169 |  | 113,250 |
Offices supplies | 9,056 |  | 18,150 |  | 14,654 |
Travels expenses | 68,320 |  | 180,366 |  | 178,586 |
Insurance | 255,898 |  | 131,238 |  | 138,786 |
Property, plant and equipment maintenance | 1,872,450 |  | 3,494,687 |  | 2,649,800 |
Depreciation of property, plant and equipment | 6,161,233 |  | 5,031,234 |  | 4,655,763 |
Taxes and contributions | 3,003,392 |  | 4,144,215 |  | 3,509,811 |
Advertising | 85,997 |  | 122,713 |  | 10,170 |
Doubtful accounts | 95,067 |  | 3,315 |  | 277,537 |
Banks expenses | 23,734 |  | 26,286 |  | 25,446 |
Interests expense | 3,358,279 |  | 3,416,877 |  | 3,508,840 |
Foreign exchange loss | 14,836,082 |  | 21,287,642 |  | 27,481,250 |
Capitalized financial costs | 0 |  | (607,453) |  | 0 |
Costs of services rendered to third parties | 108,667 |  | 18,602 |  | 346,137 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 53,697 |  | 180,667 |  | 184,301 |
Total | 37,892,338 |  | 46,391,710 |  | 52,416,507 |
Tax on exports | 421,172 |  | 1,148,234 |  | 521,232 |
Operating Expenses, Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 1,813,778 |  | 1,992,017 |  | 1,866,300 |
Social security taxes | 355,095 |  | 369,771 |  | 303,143 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 34,515 |  | 20,943 |  | 14,758 |
Technical operator assistance fees | 589,450 |  | 1,056,723 |  | 1,755,077 |
Materials | 164,268 |  | 230,643 |  | 143,852 |
Third parties services | 235,552 |  | 245,103 |  | 214,277 |
Telecommunications and post expenses | 13,338 |  | 17,638 |  | 8,788 |
Rents | 10,096 |  | 17,313 |  | 16,036 |
Transports and freight | 92,915 |  | 99,383 |  | 88,444 |
Easements | 87,574 |  | 118,942 |  | 113,250 |
Offices supplies | 3,087 |  | 5,471 |  | 4,966 |
Travels expenses | 30,715 |  | 89,168 |  | 79,945 |
Insurance | 146,906 |  | 64,137 |  | 79,933 |
Property, plant and equipment maintenance | 1,609,864 |  | 3,040,075 |  | 2,315,295 |
Depreciation of property, plant and equipment | 4,222,188 |  | 3,870,024 |  | 3,377,834 |
Taxes and contributions | 505,742 |  | 454,949 |  | 357,119 |
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 |
Capitalized financial costs |  |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 22,482 |  | 107,877 |  | 76,447 |
Total | 9,937,565 |  | 11,800,177 |  | 10,815,464 |
Operating Expenses, Non Regulated Activities [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 1,265,416 |  | 1,297,722 |  | 1,189,130 |
Social security taxes | 253,176 |  | 232,128 |  | 177,888 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 13,299 |  | 338,511 |  | 284,039 |
Technical operator assistance fees | 841,012 |  | 501,783 |  | 1,003,463 |
Materials | 288,769 |  | 297,273 |  | 325,142 |
Third parties services | 262,707 |  | 303,408 |  | 272,797 |
Telecommunications and post expenses | 10,523 |  | 8,300 |  | 5,983 |
Rents | 5,185 |  | 28,781 |  | 21,573 |
Transports and freight | 61,244 |  | 55,206 |  | 48,135 |
Easements | 10,870 |  | 6,227 |  | 0 |
Offices supplies | 1,288 |  | 3,145 |  | 1,803 |
Travels expenses | 19,972 |  | 48,923 |  | 56,001 |
Insurance | 91,016 |  | 51,871 |  | 49,624 |
Property, plant and equipment maintenance | 230,192 |  | 406,252 |  | 301,820 |
Depreciation of property, plant and equipment | 1,598,481 |  | 949,432 |  | 717,723 |
Taxes and contributions | 26,080 |  | 33,318 |  | 42,057 |
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 |
Capitalized financial costs |  |  | 0 |  |  |
Costs of services rendered to third parties | 108,667 |  | 18,602 |  | 346,137 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 21,979 |  | 59,734 |  | 57,545 |
Total | 5,109,876 |  | 4,640,616 |  | 4,900,860 |
Administrative Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 741,580 |  | 823,076 |  | 747,477 |
Social security taxes | 165,837 |  | 159,359 |  | 145,796 |
Compensation to Directors and Supervisory Committee | 40,039 |  | 44,284 |  | 54,072 |
Professional services fees | 241,111 |  | 254,542 |  | 262,271 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 19,290 |  | 33,334 |  | 41,446 |
Telecommunications and post expenses | 20,785 |  | 32,608 |  | 29,860 |
Rents | 9,157 |  | 12,100 |  | 12,453 |
Transports and freight | 2,570 |  | 3,315 |  | 6,029 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 4,408 |  | 7,056 |  | 6,555 |
Travels expenses | 15,111 |  | 37,221 |  | 34,338 |
Insurance | 17,962 |  | 8,701 |  | 9,223 |
Property, plant and equipment maintenance | 32,394 |  | 48,360 |  | 32,685 |
Depreciation of property, plant and equipment | 340,564 |  | 211,778 |  | 560,206 |
Taxes and contributions | 1,278 |  | 5,314 |  | 4,457 |
Advertising | 0 |  | 0 |  | 0 |
Doubtful accounts | 0 |  | 0 |  | 0 |
Banks expenses | 23,734 |  | 26,286 |  | 25,446 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Capitalized financial costs |  |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 6,972 |  | 8,446 |  | 41,995 |
Total | 1,682,792 |  | 1,715,780 |  | 2,014,309 |
Selling Expenses [Member] |  |  |  |  |  |
Expenses by Nature [abstract] |  |  |  |  |  |
Salaries, wages and other compensations | 230,030 |  | 234,685 |  | 203,353 |
Social security taxes | 49,833 |  | 48,930 |  | 43,829 |
Compensation to Directors and Supervisory Committee | 0 |  | 0 |  | 0 |
Professional services fees | 27,358 |  | 43,738 |  | 14,224 |
Technical operator assistance fees | 0 |  | 0 |  | 0 |
Materials | 0 |  | 0 |  | 0 |
Third parties services | 561 |  | 11,550 |  | 19,720 |
Telecommunications and post expenses | 2,774 |  | 2,457 |  | 974 |
Rents | 759 |  | 1,378 |  | 1,847 |
Transports and freight | 0 |  | 0 |  | 0 |
Easements | 0 |  | 0 |  | 0 |
Offices supplies | 273 |  | 2,478 |  | 1,330 |
Travels expenses | 2,522 |  | 5,054 |  | 8,302 |
Insurance | 14 |  | 6,529 |  | 6 |
Property, plant and equipment maintenance | 0 |  | 0 |  | 0 |
Depreciation of property, plant and equipment | 0 |  | 0 |  | 0 |
Taxes and contributions | 2,470,292 | [1] | 3,650,634 | [2] | 3,106,178 | [3]
Advertising | 85,997 |  | 122,713 |  | 10,170 |
Doubtful accounts | 95,067 |  | 3,315 |  | 277,537 |
Banks expenses | 0 |  | 0 |  | 0 |
Interests expense | 0 |  | 0 |  | 0 |
Foreign exchange loss | 0 |  | 0 |  | 0 |
Capitalized financial costs |  |  | 0 |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 2,264 |  | 4,610 |  | 8,314 |
Total | 2,967,744 |  | 4,138,071 |  | 3,695,784 |
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 | 3,358,279 |  | 3,416,877 |  | 3,508,840 |
Foreign exchange loss | 14,836,082 |  | 21,287,642 |  | 27,481,250 |
Capitalized financial costs |  |  | (607,453) |  |  |
Costs of services rendered to third parties | 0 |  | 0 |  | 0 |
Other financial charges |  |  |  |  | 0 |
Other expenses | 0 |  | 0 |  | 0 |
Total | $ 18,194,361 |  | $ 24,097,066 |  | $ 30,990,090 |
[1] | Includes tax on exports for Ps. 421,172 for the year ended December 31, 2020.
[2] | Includes tax on exports of Ps. 1,148,234 for the year ended December 31, 2019.
[3] | Includes tax on exports for Ps. 521,232 for the year ended December 31, 2018.

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- Definition The amount of expense arising from travel. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_9&doctype=Standard -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Adjustments for doubtful accounts to reconcile profit (loss) to net cash flow from (used in) operating activities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

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

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

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- Definition The amount of expenses for technical operator assistance fees in related party transactions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |