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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Tender offer litigation) (Details) R$ / shares in Units, R$ in Billions, $ in Billions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 R$ / shares shares | Dec. 31, 2023 BRL (R$) | Dec. 31, 2023 USD ($) | Oct. 17, 2023 justice | Dec. 31, 2017 member | Dec. 31, 2016 decision
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Number of justices |  |  |  | 2 | 2 |
Contingent liability, spread on monetary adjustments and interest |  |  |  | 0.01 |  |
Contingent liability, portion of legal costs from compensation payable |  |  |  | 0.10 |  |
Number of decisions issued | decision |  |  |  |  |  | 2
Ternium Investments S.à.r.l. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Contingent liability, tender offer litigation |  | R$ 3.1 | $ 0.6 |  |  |
Ternium Argentina S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Contingent liability, tender offer litigation |  | R$ 1.1 | $ 0.2 |  |  |
Pending Litigation | Comphania Siderúrgica Nacional vs. Ternium Investments S.a.r.l., Siderar & Confab Industrial S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Tender offer, percent | 80.00% |  |  |  |  |
Tender offer, price per share | R$ / shares | R$ 28.8 |  |  |  |  |
Tender offer, number of shares | shares | 182,609,851 |  |  |  |  |
Ternium Investments S.à.r.l. | Pending Litigation | Comphania Siderúrgica Nacional vs. Ternium Investments S.a.r.l., Siderar & Confab Industrial S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Proportion of shares in tender offer | 60.60% |  |  |  |  |
Ternium Argentina S.A. | Pending Litigation | Comphania Siderúrgica Nacional vs. Ternium Investments S.a.r.l., Siderar & Confab Industrial S.A. |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Proportion of shares in tender offer | 21.50% |  |  |  |  |

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