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BASIS OF PRESENTATION (Disclosure of interest in subsidiaries) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 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 Argentina S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 62.49% | 62.46% | 61.50%
Impeco S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 62.49% | 62.49% | 61.54%
Prosid Investments S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 62.49% | 62.46% | 61.51%
Ternium Mexico S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Las Encinas S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Ferropak Comercial S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Transamerica E. & I. Trading Corp. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Galvacer Chile SA |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Ternium Gas Mexico S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 89.22% | 89.21% | 88.94%
Consorcio Minero Benito Juarez Peña Colorada S.A.de C.V. & Exiros B.V. (9) |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 50.00% |  |
Consorcio Minero Benito Juarez Pena Colorada |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary | 44.61% | 44.61% | 44.47%
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% | 66.47% | 66.26%
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%
Ternium Brasil Ltda. |  |  |
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%
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%
Hylsa S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 89.21% | 88.94%
Tecnica Industrial S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 89.21% | 88.94%
Pena Colorada Servicios S.A. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 44.61% | 44.47%
Ternium Treasury Services S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
Ternium International Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00%
Ternium Investments Switzerland AG |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00%
Ternium Internacional S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00%
Ternium Staal B.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00%
Ternium Investments S.a.r.l. | Ternium Internacional Espana S.L., Ternium Solutions S.A. and Ternium Internationaal B.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
Ternium Investments S.a.r.l. | Ternium USA Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary |  | 100.00% |
Ternium Internacional Espana S.L. | Ternium USA Inc. |  |  |
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 | 62.49% |  |
Ternium Internacional Espana S.L. | Ternium Colombia S.A.S., Ternium del Cauca S.A.S., Ternium Siderúrgica de Caldas S.A.S., Ternium del Atlántico S.A.S, Ternium Procurement S.A. , & Technology & Engineering Services S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |
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. | Tenigal S. de R.L. de C.V. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 51.00% |  |
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. | Las Encinas S.A. de C.V., Ferropak Comercial S.A. de C.V., Transamerica E. & I. Trading Corp. & Galvacer Chile 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 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 Internacional España S.L. and Ternium Mexico S.A. de C.V. | Ternium Internacional Guatemala S.A. |  |  |
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 Gestión S.A. and Ternium Participaçoes S.A. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of voting rights held in subsidiary | 100.00% |  |

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