v3.26.1
BASIS OF PRESENTATION (Disclosure of Interest in Subsidiaries) (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Ternium S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Investments S.à.r.l.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Solutions S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Internationaal B.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium USA Inc.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium USA Inc. | Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Argentina S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 62.57% 62.57% 62.57%
Ternium Argentina S.A. | Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 62.57%    
Prosid Investments S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 62.58% 62.58% 62.58%
Prosid Investments S.A. | Ternium Argentina S.A. and Ternium Procurement S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Ternium Mexico S.A. de C.V. | Ternium Argentina S.A. and Ternium Internacional Espana S.L.U.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Las Encinas S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Ferropak Comercial S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Transamerica E. & I. Trading Corp.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Galvacer Chile S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Ternium Gas México S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.25% 89.25% 89.25%
Consorcio Minero Benito Juarez Peña Colorada S.A.de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 44.62% 44.62% 44.62%
Exiros B.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 50.00% 50.00% 50.00%
Servicios Integrales Nova de Monterrey S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 66.49% 66.49% 66.49%
Servicios Integrales Nova de Monterrey S.A. de C.V. | Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 74.50%    
Ternium Internacional Nicaragua S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 99.38% 99.38% 99.38%
Ternium Internacional Honduras S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 99.18% 99.18% 99.18%
Ternium Internacional El Salvador S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 99.92% 99.92% 99.92%
Ternium Internacional Costa Rica S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 99.98% 99.98% 99.98%
Ternium Internacional Guatemala S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 99.98% 99.98% 99.98%
Ternium Internacional Guatemala S.A. | Ternium Internacional España S.L. and Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Colombia S.A.S      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium del Cauca S.A.S.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 0.00% 100.00% 100.00%
Ternium del Atlántico S.A.S      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Procurement S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Technology & Engineering Services S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Brasil Ltda.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Brasil Ltda. | Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Tenigal S. de R.L. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 51.00% 51.00% 51.00%
Tenigal S. de R.L. de C.V. | Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 51.00%    
Soluciones Integrales de Gestión S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 23.30% 23.30% 23.30%
Usinas Siderúrgicas de Minas Gerais S.A. | Ternium Investments S.à r.l., Prosid Investments S.A. And Ternium Argentina S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 42.57%    
Mineração Usiminas S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 16.31% 16.31% 16.31%
Mineração Usiminas S.A. | Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 29.80%    
Soluções Em Aço Usiminas S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 16.05% 16.05% 16.05%
Soluções Em Aço Usiminas S.A. | Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 29.32%    
Usiminas Mecânica S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 23.30% 23.30% 23.30%
Usiminas Internatioonal S.À R.L.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 23.30% 23.30% 23.30%
Usiminas Internatioonal S.À R.L. | Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 42.57%    
Usiminas Participações E Logística S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 17.48% 17.48% 17.48%
Usiminas Participações E Logística S.A. | Usinas Siderúrgicas de Minas Gerais S.A. And Mineração Usiminas S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 36.20%    
Metalcentro Ltda.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 23.30% 23.30% 23.30%
Metalcentro Ltda. | Usinas Siderúrgicas de Minas Gerais S.A. And Usiminas Mecânica S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 42.57%    
Vientos de Olavarría S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 0.00% 62.57% 62.57%
Rios Unidos logistica e transporte de açõ Ltda.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 0.00% 0.00% 23.30%
Ternium Internacional Espana S.L., Ternium Solutions S.A. and Ternium Internationaal B.V. | Ternium Investments S.à.r.l.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Las Encinas S.A. de C.V., Ferropak Comercial S.A. de C.V., Transamerica E. & I. Trading Corp. & Galvacer Chile S.A. | Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Gas Mexico S.A. de C.V. | Ternium Mexico S.A. de C.V and Tenigal S. de R.L. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Consorcio Minero Benito Juarez Peña Colorada S.A.de C.V. & Exiros B.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 50.00%    
Ternium Colombia S.A.S., Ternium del Cauca S.A.S., Ternium del Atlántico S.A.S, Ternium Procurement S.A. , & Technology & Engineering Services S.A. | Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Soluciones Integrales de Gestión S.A. and Ternium Participaçoes S.A. | Ternium Investments S.a.r.l & Ternium Internacional Espana S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Usiminas Mecânica S.A. And Rios Unidos logistica e transporte de açõ Ltda. | Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 42.57%