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Note 14 - Investments in non-consolidated companies (Tables) | 12 Months Ended
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Dec. 31, 2025
Disclosure of unconsolidated structured entities [line items] |
Disclosure of unconsolidated structured entities [text block] |
| Year ended December 31, |
| 2025 |  |  | 2024 |
At the beginning of the year | 1,543,657 |  |  | 1,608,804 |
Translation differences | 21,692 |  |  | (47,840 | )
Equity in earnings of non-consolidated companies | 58,038 |  |  | 8,548 |
Dividends and distributions declared | (62,022 | ) |  | (71,212 | )
(Decrease) / increase in equity reserves and others | (153 | ) |  | 45,357 |
At the end of the year | 1,561,212 |  |  | 1,543,657 |
Disclosure of detailed information about principal non-consolidated companies [text block] |
|  | % ownership at December 31, |  | Book value at December 31, |
Company | Country of incorporation | 2025 |  | 2024 |  | 2025 |  |  | 2024 |
a) Ternium (*) | Luxembourg | 11.46% |  | 11.46% |  | 1,375,115 |  |  | 1,377,911 |
b) Usiminas (**) | Brazil | 3.96% |  | 3.96% |  | 108,574 |  |  | 102,812 |
c) Techgen | Mexico | 22.00% |  | 22.00% |  | 73,936 |  |  | 59,782 |
Others |  |  |  |  |  | 3,587 |  |  | 3,152 |
|  |  |  |  |  | 1,561,212 |  |  | 1,543,657 |
(*) | At December 31, 202 5 and 202 4, the voting rights were 11.70%.
(**) | At December 31, 20 2 5 and 202 4, the voting rights were 6.76%.
Ternium S.A. [member] |
Disclosure of unconsolidated structured entities [line items] |
Disclosure of detailed information about selected financial information [text block] |
| Ternium |
| 2025 |  |  | 2024 |
Non-current assets | 13,818,723 |  |  | 12,050,457 |
Current assets | 9,796,368 |  |  | 11,078,090 |
Total assets | 23,615,091 |  |  | 23,128,547 |
Non-current liabilities | 3,533,136 |  |  | 3,157,819 |
Current liabilities | 3,934,209 |  |  | 3,839,159 |
Total liabilities | 7,467,345 |  |  | 6,996,978 |
Total equity | 16,147,746 |  |  | 16,131,569 |
Non-controlling interests | 4,203,446 |  |  | 4,163,383 |
Revenues | 15,609,094 |  |  | 17,649,060 |
Gross profit | 2,353,104 |  |  | 2,888,836 |
Net income / (loss) for the year attributable to shareholders' equity | 425,232 |  |  | (53,672 | )
Other comprehensive income attributable to shareholders' equity | 80,913 |  |  | 211,817 |
Total comprehensive income attributable to shareholders' equity | 506,145 |  |  | 158,145 |
Usiminas [member] |
Disclosure of unconsolidated structured entities [line items] |
Disclosure of detailed information about selected financial information [text block] |
| Usiminas |
| 2025 |  |  | 2024 |
Non-current assets | 3,431,865 |  |  | 3,623,996 |
Current assets | 3,053,444 |  |  | 3,234,742 |
Total assets | 6,485,309 |  |  | 6,858,738 |
Non-current liabilities | 1,436,623 |  |  | 1,357,347 |
Current liabilities | 741,224 |  |  | 772,412 |
Total liabilities | 2,177,847 |  |  | 2,129,758 |
Total equity | 4,307,462 |  |  | 4,728,980 |
Non-controlling interests | 524,771 |  |  | 452,481 |
Revenues | 4,696,469 |  |  | 4,800,787 |
Gross profit | 390,533 |  |  | 308,043 |
Net loss for the year attributable to shareholders' equity | (550,447 | ) |  | (27,084 | )
Other comprehensive income attributable to shareholders' equity | 1,605 |  |  | 31,564 |
Total comprehensive (loss) / income attributable to shareholders' equity | (548,842 | ) |  | 4,480 |

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- Definition The disclosure of unconsolidated structured entities. [Refer: Total for all unconsolidated structured entities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph B4 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B4_e&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 75 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_75_d&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 75 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_75_d&doctype=Standard -URIDate 2025-03-27 + Details
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