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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments) (Details) m³ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) MWh | Apr. 24, 2017 MWh | Dec. 20, 2000 electrical_plant | Dec. 31, 2017 USD ($) MWh t m³ | Dec. 31, 2006 MWh distributor | Dec. 31, 2016 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Borrowings | $ 3,221,907,000 |  |  | $ 3,221,907,000 |  | $ 1,218,635,000
Dividend payables | $ 3,100,000,000 |  |  | $ 3,100,000,000 |  |
Tenaris |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Minimum mass required (tons per hour) | t |  |  |  | 250 |  |
Techgen S.A. de C.V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term contract for purchase of electric power, term |  | 25 years |  |  |  |
Long-term contract for purchase of electric power, electrical demand | MWh |  | 699 |  |  |  |
Percentage of electricity needs supplied |  | 78.00% |  |  |  |
Ternium Mexico S.A. de C.V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Number of electrical plants | electrical_plant |  |  | 4 |  |  |
Iberdrola Energia Monterey, S.A. de C.V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term contract for purchase of electric power, term |  |  | 25 years |  |  |
Long-term contract for purchase of electric power, electrical demand | MWh | 51.7 |  |  | 111.2 |  |
Percentage of electricity needs supplied |  |  |  | 25.00% |  |
Long-term contract for purchase of electric power, credit (per megawatt) |  |  |  | $ 750,000 |  |
Long-term contract for purchase of electric power, credit |  |  |  | 83,400,000 |  |
Long-term contract for purchase of electric power, discount |  |  |  | $ 15,000,000 |  |
Long-term contract for purchase of electric power, length that rates are similar to previous term |  |  |  | 1 year |  |
Long-term contract for purchase of electric power, percentage discount on contract |  |  |  | 2.50% |  |
Tractebel Energia de Monterrey, S. de R.L. de C.V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term contract for purchase of electric power, contracted amount |  |  |  | $ 8,800,000.0 |  |
Gas Industrial de Monterrey, S.A. de C.V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Guarantor obligations, borrowing outstanding | $ 40,400,000 |  |  | 40,400,000 |  |
Guarantor obligations, current carrying value | 12,800,000 |  |  | 12,800,000 |  |
Kinder Morgan Gas |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Guarantor obligations, borrowing outstanding | 265,000,000 |  |  | 265,000,000 |  |
Ternium Brasil Ltda. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term contract for purchase of electric power, term |  |  |  |  | 15 years |
Long-term contract for purchase of electric power, electrical demand | MWh |  |  |  |  | 200 |
Number of distributors | distributor |  |  |  |  | 24 |
GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 190,700,000 |  |
Long-term purchase commitment, period for maintenance services of turbines |  |  |  | 20 years |  |
Primetals Technologies Brazil Ltda. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 53,000,000 |  |
Air Liquide Brasil Ltda., AirSteel Ltda., White Martins Gases Industriais Ltda., White Martins Steel Ltda. and ThyssenKrupp MinEnergy GmbH |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 55,000,000 |  |
Companhia Distribuidora de Gás do Rio de Janeiro |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, minimum percentage of volume required |  |  |  | 85.00% |  |
Long-term purchase commitment, amount |  |  |  | $ 33,900,000 |  |
Long-term purchase commitment, volume | m³ |  |  |  | 61.3 |  |
Public utilities inventory, fuel | Air Liquide Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 30,900,000 |  |
Iron Ore, Pellets and Iron Ore Fines | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, minimum percentage of volume required |  |  |  | 80.00% |  |
Long-term purchase commitment, amount |  |  |  | $ 844,000,000 |  |
Iron Ore, Pellets and Iron Ore Fines | Vale S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, total purchased volume | t |  |  |  | 8,000,000 |  |
Freight Services |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, minimum quantity required (per month) | t |  |  |  | 200,000 |  |
Long-term purchase commitment, quantity required | t |  |  |  | 1,200,000 |  |
Freight Services | Ferrocarril Mexicano, S. A. de C. V. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, period |  |  |  | 5 years |  |
Long-term purchase commitment, period to make investments to improve loading and unloading of gondolas |  |  |  | 36 months |  |
Ternium S.A. | Kinder Morgan Gas |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Guarantor obligations, borrowing outstanding | 127,000,000 |  |  | $ 127,000,000 |  |
Guarantor obligations, percentage |  |  |  | 48.00% |  |
Techgen S.A. de C.V. | Syndicated Loan |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Borrowings | 800,000,000 |  |  | $ 800,000,000 |  |
Borrowings outstanding | 720,000,000 |  |  | 720,000,000 |  |
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Guarantor obligations,outstanding | $ 346,000,000 |  |  | $ 346,000,000 |  |
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Guarantor obligations, percentage |  |  |  | 48.00% |  |
Scenario one | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, minimum percentage of volume required |  |  |  | 80.00% |  |
Long-term purchase commitment, percentage of penalty |  |  |  | 7.00% |  |
Scenario one | Bottom of range | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, percentage of total volume actually operated |  |  |  | 70.00% |  |
Scenario one | Top of range | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, percentage of total volume actually operated |  |  |  | 75.00% |  |
Scenario two | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, minimum percentage of volume required |  |  |  | 80.00% |  |
Long-term purchase commitment, percentage of penalty |  |  |  | 15.00% |  |
Scenario two | Bottom of range | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, percentage of total volume actually operated |  |  |  | 70.00% |  |
Forecast | Tenaris |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 11,400,000 |  |
Forecast | Natural Gas | Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Long-term purchase commitment, amount |  |  |  | $ 18,600,000 |  |

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