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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%