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BASIS OF PRESENTATION (Disclosure of interest in subsidiaries) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 Solutions A.G. |  |  |
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 International Switzerland S.A |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Ternium Internacional España S.L.U. |  |  |
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 Argentina S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 60.94% | 60.94% | 60.94%
Impeco S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 60.97% | 60.97% | 60.97%
Prosid Investments S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 60.94% | 60.94% | 60.94%
Ternium Mexico S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Hylsa S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Las Encinas S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Ferropak Comercial S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Galvacer America Inc |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 0.00% | 88.78% | 88.72%
Galvamet America Corp |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Transamerica E. & I. Trading Corp. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Técnica Industrial S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Acedor, S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Ternium Gas México S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 88.78% | 88.78% | 88.72%
Ternium Internacional Guatemala S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 99.98% | 99.98% | 99.98%
Consorcio Minero Benito Juarez Peña Colorada S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 44.39% | 44.39% | 44.36%
Peña Colorada Servicios S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 44.39% | 44.39% | 44.36%
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 | 66.14% | 66.14% | 66.09%
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% | 99.91%
Ternium Internacional Costa Rica S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 99.98% | 99.98% | 99.98%
Ternium Colombia S.A.S (formerly Ferrasa 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. (formerly Perfilamos del Cauca S.A.S.) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Ternium Siderúrgica de Caldas S.A.S. (formerly Siderúrgica de Caldas S.A.S.) |  |  |
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%
Ternium International B.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Ternium Internacional S.A. |  |  |
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% | 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 USA Corporation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Ternium Internacional de Colombia S.A.S. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 100.00% | 100.00%
Ternium Ingeniería y Servicios de Mexico 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%
Procesadora de Materiales Industriales S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 0.00% | 0.00% | 100.00%
Ferropak Servicios S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 0.00% | 0.00% | 88.72%
Corporativo Grupo Imsa S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 0.00% | 0.00% | 88.72%
Ternium International Equador S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 0.00% | 0.00% | 100.00%
Ternium Staal B.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 0.00% | 0.00%
Ternium Brasil Ltda. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 0.00% | 0.00%
Ecosteel Gestao de Efuentes Industriais S,A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 0.00% | 0.00%
Ecosteel Gestao de Aguas Industriais S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 0.00% | 0.00%
Ternium del Atlantico S.A.S |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% | 0.00% | 0.00%
Ternium S.A. | 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.à.r.l. | Ternium USA Corporation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Investments S.à.r.l. | Ternium Solutions A.G., Ternium Participacoes S.A., Ternium Investments Switzerland AG, Ternium Internacional Espana S.L.U. & Ternium USA Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Investments S.à.r.l. | Ternium Internationaal B.V. & Ternium International Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Investments S.à.r.l. | Ternium Staal B.V., Ternium Brasil Ltda., Ecosteel Gestao de Efuentes Industriais S.A. & Ecosteel Gestao de Aguas Industriais S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Internacional España S.L.U. | Ternium Argentina S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 60.94% |  |
Ternium Internacional España S.L.U. | Ternium Internacional Guatemala S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Internacional España S.L.U. | Tenigal S. de R.L. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 51.00% |  |
Ternium Internacional España S.L.U. | Ternium del Atlantico S.A.S |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Internacional España S.L.U. | Ternium Colombia S.A.S., Ternium del Cauca S.A.S. & Ternium Siderurgica de Caldas S.A.S. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Internacional España S.L.U. | Ternium Procurement S.A. & Technology & Engineering Services S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Argentina S.A. and Soluciones Integrales 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 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. | Hysla S.A. de C.V., Las Encinas S.A. de C.V., Ferropak Comercial S.A. de C.V., Galvamet America Corp, Transamerica E. & I. Trading Corp., Tecnica Industrial S.A.. de C.V. & Acedor, S.A. de C.V. [Member] |  |  |
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 México S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium International Switzerland S.A | Ternium Internacional S.A. & Ternium Treasury Services S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Internacional S.A. | Ternium Internacional de Colombia S.A.S. |  |  |
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.U. | Soluciones Integrales de Gestion S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |

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