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PROFIT FROM ASSOCIATES | 12 Months Ended
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Dec. 31, 2017
PROFIT FROM ASSOCIATES [Abstract] |
PROFIT FROM ASSOCIATES |
| 11. | PROFIT FROM ASSOCIATES
|  | 2017 |  |  | 2016 |  |  | 2015 |
EGS |  |  | 11 |  |  |  | 780 |  |  |  | 177 |
TGU |  |  | 179 |  |  |  | 742 |  |  |  | 77 |
Total |  |  | 190 |  |  |  | 1,522 |  |  |  | 254 |

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- References No definition available. + Details
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Namespace Prefix: | tgs_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The entire disclosure for profit from associates. + References No definition available. + Details
Name: | tgs_ProfitFromAssociatesTextBlock
Namespace Prefix: | tgs_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration