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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |  |  |  |  |  |
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Dec. 31, 2022 USD ($) member vice-president $ / shares MW shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2022 R$ / shares | Jun. 30, 2022 | Dec. 31, 2021 R$ / shares | Aug. 05, 2021 USD ($) | Dec. 31, 2019 USD ($) | Feb. 28, 2019
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |
Investments in associates | $ 725,700 | $ 681,700 |  |  |  |  |  |  |
Revenue | 16,414,466 | 16,090,744 | $ 8,735,435 |  |  |  |  |  |
Net sales | 16,414,466 | 16,090,744 | 8,735,435 |  |  |  |  |  |
Non-current assets | 8,647,510 | 8,491,363 |  |  |  |  |  |  |
Current assets | 8,844,038 | 8,606,544 |  |  |  |  |  |  |
Non-current liabilities | 1,506,325 | 1,649,105 |  |  |  |  |  |  |
Current liabilities | 2,216,830 | 3,213,764 |  |  |  |  |  |  |
Usiminas' shareholders' equity | 13,768,393 | 12,235,038 | $ 8,443,153 |  |  |  |  | $ 7,714,873 |
Borrowings | 1,031,865 | 1,479,038 |  |  |  |  |  |  |
Non-consolidated parties |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |
Investments in associates | 356,200 | 653,900 |  |  |  |  |  |  |
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 Siderurgicas de Minas Gerais S.A. - USIMINAS |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |
Revenue | 6,297,000 | 6,270,000 |  |  |  |  |  |  |
Net sales | 6,297,000 | 6,270,000 |  |  |  |  |  |  |
Usiminas' shareholders' equity | $ 4,437,784 | 3,897,000 |  |  |  |  |  |  |
Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | 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 | $ 580,000 | 419,000 |  |  |  |  |  |  |
Number of megawatts (MW) | MW | 900 |  |  |  |  |  |  |  |
Net sales | $ 580,000 | 419,000 |  |  |  |  |  |  |
Profit (loss) from continuing operations | 55,000 | 45,000 |  |  |  |  |  |  |
Non-current assets | 766,000 | 791,000 |  |  |  |  |  |  |
Current assets | 131,000 | 91,000 |  |  |  |  |  |  |
Non-current liabilities | 527,000 | 614,000 |  |  |  |  |  |  |
Current liabilities | 181,000 | 134,000 |  |  |  |  |  |  |
Usiminas' shareholders' equity | 189,000 | $ 134,000 |  |  |  |  |  |  |
Subordinated liabilities | $ 126,800 |  |  |  |  |  |  |  |
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.à.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 | $ 344,000 |  |  |  |  |  |  |  |
Debt instrument, average life |  |  |  |  | 4 years 3 months 18 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 | $ 51,000 |  |  |  |  |  |  |  |
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) | $ 1.42 | $ 2.60 |  | R$ 7.41 |  | R$ 14.51 |  |  |
Ordinary shares | Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | 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) | $ 1.37 | $ 2.72 |  | R$ 7.16 |  | R$ 15.16 |  |  |
Preferred shares | Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | 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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