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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Provision for ongoing litigation related to the acquisition of a participation in Usiminas) (Details) - Comphania Siderúrgica Nacional vs. Ternium Investments S.a r.l., Ternium Argentina, & Confab Industrial S.A.
R$ / shares in Units, R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
R$ / shares
shares
Dec. 31, 2024
USD ($)
Oct. 17, 2023
justice
Dec. 31, 2016
decision
Disclosure of contingent liabilities [line items]        
Number of justices | justice     2  
Contingent liability, attorney fees | R$ R$ 5.0      
Number of decisions issued | decision       2
Ternium Investments S.à r.l.        
Disclosure of contingent liabilities [line items]        
Contingent liability, tender offer litigation 1,875.9 $ 302.9    
Ternium Argentina S.A.        
Disclosure of contingent liabilities [line items]        
Contingent liability, tender offer litigation R$ 664.1 $ 107.3    
Pending Litigation        
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        
Disclosure of contingent liabilities [line items]        
Proportion of shares in tender offer 60.60%      
Ternium Argentina S.A. | Pending Litigation        
Disclosure of contingent liabilities [line items]        
Proportion of shares in tender offer 21.50%