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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) member vice-president $ / shares MW shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2021 R$ / shares | Aug. 05, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 R$ / shares | Dec. 31, 2019 R$ / shares | Feb. 28, 2019 | Dec. 31, 2018 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 681,700 | $ 422,900 |  |  |  |  |  |  |  |
Revenue | 16,090,744 | 8,735,435 | $ 10,192,818 |  |  |  |  |  |  |
Net sales | 16,090,744 | 8,735,435 | 10,192,818 |  |  |  |  |  |  |
Non-current assets | 8,491,363 | 8,289,460 |  |  |  |  |  |  |  |
Current assets | 8,606,544 | 4,566,775 |  |  |  |  |  |  |  |
Non-current liabilities | 1,649,105 | 2,559,485 |  |  |  |  |  |  |  |
Current liabilities | 3,213,764 | 1,853,597 |  |  |  |  |  |  |  |
Equity | 12,235,038 | 8,443,153 | $ 7,714,873 |  |  |  |  |  |  | $ 7,484,576
Borrowings | 1,479,038 | 1,722,893 |  |  |  |  |  |  |  |
Non-consolidated parties |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Investments in associates | 653,900 | 756,300 |  |  |  |  |  |  |  |
Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Payment for purchase of participation in borrowing arrangement |  |  |  |  | $ 68,000 |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Revenue | 6,270,000 | 3,133,000 |  |  |  |  |  |  |  |
Net sales | 6,270,000 | 3,133,000 |  |  |  |  |  |  |  |
Equity | $ 3,897,381 | 2,861,000 |  |  |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 20.40% |  |  |  |  |  |  |  |  |
Usiminas Control Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 68.60% |  |  |  |  |  |  |  |  |
Number of executive board members | member | 6 |  |  |  |  |  |  |  |  |
Number of vice-presidents | vice-president | 5 |  |  |  |  |  |  |  |  |
Usiminas Control Group | Ternium Investments and NSC Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Length between electing chief executive officer | 4 years |  |  |  |  |  |  |  |  |
Usiminas Control Group | Ternium Investments |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of board members to elect | member | 3 |  |  |  |  |  |  |  |  |
Usiminas Control Group | NSC Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of board members to elect | member | 3 |  |  |  |  |  |  |  |  |
Usiminas Control Group | T/T Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 47.10% |  |  |  |  |  |  |  |  |
Usiminas Control Group | Ternium S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 39.50% |  |  |  |  |  |  |  |  |
Usiminas Control Group | TenarisConfab |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 7.60% |  |  |  |  |  |  |  |  |
Usiminas Control Group | NSC Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 45.90% |  |  |  |  |  |  |  |  |
Usiminas Control Group | Previdencia Usiminas |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 7.00% |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Revenue | $ 419,000 | 314,000 |  |  |  |  |  |  |  |
Number of megawatts (MW) | MW | 900 |  |  |  |  |  |  |  |  |
Net sales | $ 419,000 | 314,000 |  |  |  |  |  |  |  |
Profit (loss) from continuing operations | 45,000 | 44,000 |  |  |  |  |  |  |  |
Non-current assets | 791,000 | 833,000 |  |  |  |  |  |  |  |
Current assets | 91,000 | 59,000 |  |  |  |  |  |  |  |
Non-current liabilities | 614,000 | 709,000 |  |  |  |  |  |  |  |
Current liabilities | 134,000 | 95,000 |  |  |  |  |  |  |  |
Equity | 134,000 | $ 89,000 |  |  |  |  |  |  |  |
Subordinated liabilities | $ 127,400 |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. | Ternium S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 48.00% |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate's power supply (percent) | 78.00% |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. | Tecpetrol International S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 30.00% |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. | Ternium Investments S.a.r.l. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 22.00% |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate's power supply (percent) | 22.00% |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 423,000 |  |  |  |  | $ 463,000 |  |  |  |
Debt instrument, average life |  |  |  |  |  | 2 years 7 months 24 days |  |  |  |
Debt instrument, percentage of debt service reserve account |  |  |  |  |  | 10.00% |  |  |  |
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Payment for purchase of participation in borrowing arrangement | $ 62,000 |  |  |  |  |  |  |  |  |
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | London Interbank Offered Rate (LIBOR)1 | Techgen S.A. de C.V. Syndicated Loan Due February 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  | 1.70% |
Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Share price (per share) | (per share) | $ 2.60 | $ 3.02 |  | R$ 14.51 |  |  | R$ 15.69 |  |  |
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 242.6 |  |  |  |  |  |  |  |  |
Ordinary shares | Usiminas Control Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 483.6 |  |  |  |  |  |  |  |  |
Preferred shares |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Share price (per share) | (per share) |  | $ 2.72 | $ 2.81 |  |  |  | R$ 15.16 | R$ 14.61 |  |
Preferred shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 8.5 |  |  |  |  |  |  |  |  |

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