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BASIS OF PRESENTATION (Disclosure of interest in subsidiaries) (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Ternium S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Investments S.a.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 USA Inc.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Solutions S.A. (formerly Tericer Trading 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 Argentina S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 62.46% 61.50% 60.94%
Impeco S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 62.49% 61.54% 60.97%
Prosid Investments S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 62.46% 61.51% 60.94%
Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Hylsa S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Las Encinas S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Ferropak Comercial S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Transamerica E. & I. Trading Corp.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Tecnica Industrial S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Galvacer Chile SA      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Ternium Gas Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 89.21% 88.94% 88.78%
Consorcio Minero Benito Juarez Pena Colorada      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 44.61% 44.47% 44.39%
Pena Colorada Servicios S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 44.61% 44.47% 44.39%
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 66.47% 66.26% 66.14%
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 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 100.00% 100.00% 100.00%
Ternium Siderurgica de Caldas S.A.S.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium del Atlantico 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%
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%
Ternium Treasury Services S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Soluciones Integrales de Gestion S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00% 100.00% 100.00%
Ternium Participacoes 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 International Inc.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary   100.00% 100.00%
Ternium Investments Switzerland AG      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary   100.00% 100.00%
Ternium Internacional S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary   100.00% 100.00%
Ternium Staal B.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary   100.00% 100.00%
Imsamex Ecuador, S.A.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary     88.78%
Ternium Solutions A.G.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary     100.00%
Ternium Ingenieria y Servicios de Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary     99.89%
Ternium International USA Corporation      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary     100.00%
Consorcio Minero Benito Juarez Pena Colorada S.A.de C.V., Pena Colorada Servicios S.A. de C.V. & Exiros B.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 50.00%    
Ternium Investments S.a.r.l. | Ternium Internacional Espana S.L. & Ternium USA Inc, Ternium Solutions S.A. (formerly Tericer Trading S.A.) and Ternium Internationaal B.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Internacional Espana S.L. | Ternium Argentina S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 62.46% 61.50% 60.94%
Ternium Internacional Espana S.L. | Tenigal S. de R.L. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 51.00%    
Ternium Internacional Espana S.L. | Ternium Brasil Ltda.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Internacional Espana S.L. | Ternium Internacional Guatemala S.A., Ternium Colombia S.A.S., Ternium del Cauca S.A.S., Ternium Siderurgica de Caldas S.A.S. and Ternium Del Atllantico S.A.S.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Argentina S.A. and Soluciones Integrales de Gestion S.A | Impeco S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Argentina S.A. and Ternium Procurement S.A. | Prosid Investments S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Argentina S.A. and Ternium Internacional Espana S.L.U. | Ternium Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Mexico S.A. de C.V. | Servicios Integrales Nova de Monterrey S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 74.50%    
Ternium Mexico S.A. de C.V. | Las Encinas S.A. de C.V., Ferropak Comercial S.A. de C.V., Transamerica E. and I. Trading Corp., Tecnica Industrial S.A. de C.V., Galvacer Chile SA & Imsamex Ecuador, S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Mexico S.A. de C.V and Tenigal S. de R.L. de C.V. | Ternium Gas Mexico S.A. de C.V.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Ternium Investments S.a.r.l & Ternium Internacional Espana S.L. | Soluciones Integrales de Gestion S.A. & Ternium Participacoes S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%