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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ in Thousands, T in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) T km | Dec. 31, 2023 USD ($) T km MW | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Aug. 05, 2021 USD ($) | Dec. 31, 2020 USD ($) | Feb. 28, 2019
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Net sales |  | $ 17,610,092 | $ 16,414,466 | $ 16,090,744 |  |  |
Non-current assets | $ 12,148,560 | 12,148,560 | 8,647,510 |  |  |  |
Current assets | 12,030,544 | 12,030,544 | 8,844,038 |  |  |  |
Non-current liabilities | 3,566,643 | 3,566,643 | 1,506,325 |  |  |  |
Current liabilities | 3,800,602 | 3,800,602 | 2,216,830 |  |  |  |
Equity | 16,811,859 | 16,811,859 | 13,768,393 | $ 12,235,038 |  | $ 8,443,153 |
Borrowings | 2,146,414 | 2,146,414 | 1,031,865 |  |  |  |
Unigal Usiminas Ltda. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Net sales | 37,000 |  |  |  |  |  |
Profit (loss) from continuing operations | 17,000 |  |  |  |  |  |
Non-current assets | 163,000 | 163,000 |  |  |  |  |
Current assets | 40,000 | 40,000 |  |  |  |  |
Non-current liabilities | 48,000 | 48,000 |  |  |  |  |
Current liabilities | 11,000 | 11,000 |  |  |  |  |
Equity | $ 143,000 | $ 143,000 |  |  |  |  |
Number of tons | T | 1,030 | 1,030 |  |  |  |  |
MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Number of networks managed | km | 1,634 | 1,634 |  |  |  |  |
Usiminas | MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 11.41% |  |  |  |  |
Net sales | $ 727,000 |  |  |  |  |  |
Profit (loss) from continuing operations | 148,000 |  |  |  |  |  |
Non-current assets | 2,779,000 | $ 2,779,000 |  |  |  |  |
Current assets | 954,000 | 954,000 |  |  |  |  |
Non-current liabilities | 1,709,000 | 1,709,000 |  |  |  |  |
Current liabilities | 704,000 | 704,000 |  |  |  |  |
Equity | 1,320,000 | $ 1,320,000 |  |  |  |  |
Usiminas | Unigal Usiminas Ltda. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 70.00% |  |  |  |  |
CSN | MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 18.60% |  |  |  |  |
Congonhas Minérios | MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 18.60% |  |  |  |  |
Vale S.A. | MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 10.90% |  |  |  |  |
Gerdau |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 1.30% |  |  |  |  |
Wide Group of Small Investors | MRS Logística S.A. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 6.50% |  |  |  |  |
Nippon Steel Corporation | Unigal Usiminas Ltda. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 30.00% |  |  |  |  |
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 |  |
Techgen S.A. de C.V. |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Number of megawatts (per year) | MW |  | 900 |  |  |  |  |
Net sales |  | $ 444,000 | 580,000 |  |  |  |
Profit (loss) from continuing operations |  | 55,000 | 55,000 |  |  |  |
Non-current assets | 766,000 | 766,000 | 766,000 |  |  |  |
Current assets | 175,000 | 175,000 | 131,000 |  |  |  |
Non-current liabilities | 466,000 | 466,000 | 527,000 |  |  |  |
Current liabilities | 232,000 | 232,000 | 181,000 |  |  |  |
Equity | 243,000 | 243,000 | $ 189,000 |  |  |  |
Subordinated liabilities | 136,300 | $ 136,300 |  |  |  |  |
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] |  |  |  |  |  |  |
Debt instrument, average life |  |  |  |  |  |  | 4 years 3 months 18 days
Debt instrument, percentage of debt service reserve account |  |  |  |  |  |  | 10.00%
Borrowings | 267,000 | $ 267,000 |  |  |  |  |
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 | $ 55,000 | $ 55,000 |  |  |  |  |
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | London Interbank Offered Rate (LIBOR) | 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%

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- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Debt Instrument, Average Life + References No definition available. + Details
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- Definition Debt Instrument, Percentage of Debt Service Reserve Account + References No definition available. + Details
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- Definition Number Of Kilometres Of Network Managed + References No definition available. + Details
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- Definition Number of megawatts + References No definition available. + Details
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- Definition Payment For Purchase Of Participation In Borrowing Arrangement + References No definition available. + Details
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- Definition Plant Production Capacity, Tons + References No definition available. + Details
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- Definition Proportion of ownership interest in associate's power supply + References No definition available. + Details
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