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Note 1 - Segment information (Tables) | 12 Months Ended
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Dec. 31, 2025
Disclosure of operating segments [line items] |
Disclosure of operating segments [text block] |
Year ended December 31, 2025 | Tubes |  |  | Other |  |  | Total |
Management view - operating income | 2,163 |  |  | 108 |  |  | 2,271 |
Difference in cost of sales |  |  |  |  |  |  | 31 |
Differences in selling, general and administrative expenses |  |  |  |  |  |  | (17 | )
Differences in other operating income (expenses), net |  |  |  |  |  |  | (2 | )
IFRS - operating income |  |  |  |  |  |  | 2,283 |
Financial income (expense), net |  |  |  |  |  |  | 133 |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  | 2,416 |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  | 58 |
Income before income tax |  |  |  |  |  |  | 2,474 |
Net Sales | 11,400 |  |  | 581 |  |  | 11,981 |
Depreciation and amortization | 594 |  |  | 22 |  |  | 616 |
Year ended December 31, 2024 | Tubes |  |  | Other |  |  | Total |
Management view - operating income | 2,391 |  |  | 143 |  |  | 2,534 |
Difference in cost of sales |  |  |  |  |  |  | (115 | )
Differences in selling, general and administrative expenses |  |  |  |  |  |  | (3 | )
Differences in other operating income (expenses), net |  |  |  |  |  |  | 3 |
IFRS - operating income |  |  |  |  |  |  | 2,419 |
Financial income (expense), net |  |  |  |  |  |  | 129 |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  | 2,548 |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  | 9 |
Income before income tax |  |  |  |  |  |  | 2,557 |
Net Sales | 11,907 |  |  | 617 |  |  | 12,524 |
Depreciation and amortization | 580 |  |  | 53 |  |  | 633 |
Year ended December 31, 2023 | Tubes |  |  | Other |  |  | Total |
Management view - operating income | 4,337 |  |  | 129 |  |  | 4,466 |
Difference in cost of sales |  |  |  |  |  |  | (134 | )
Differences in selling, general and administrative expenses |  |  |  |  |  |  | (7 | )
Differences in other operating income (expenses), net |  |  |  |  |  |  | (9 | )
IFRS - operating income |  |  |  |  |  |  | 4,316 |
Financial income (expense), net |  |  |  |  |  |  | 221 |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  | 4,537 |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  | 95 |
Income before income tax |  |  |  |  |  |  | 4,633 |
Net Sales | 14,185 |  |  | 684 |  |  | 14,869 |
Depreciation and amortization | 518 |  |  | 31 |  |  | 549
Disclosure of geographical areas [text block] |
| North America |  |  | South America |  |  | Europe |  |  | Asia Pacific, Middle East and Africa |  |  | Unallocated (*) |  |  | Total |
Year ended December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 5,712,368 |  |  | 2,386,881 |  |  | 893,540 |  |  | 2,988,368 |  |  | - |  |  | 11,981,157 |
Property, plant and equipment, net | 3,489,730 |  |  | 1,432,099 |  |  | 903,687 |  |  | 379,566 |  |  | - |  |  | 6,205,082 |
Intangible Assets, net | 1,115,287 |  |  | 187,431 |  |  | 17,497 |  |  | 36,901 |  |  | - |  |  | 1,357,116 |
Right of Use Assets, net | 54,424 |  |  | 12,254 |  |  | 29,553 |  |  | 48,326 |  |  | - |  |  | 144,557 |
Investments in non-consolidated companies | - |  |  | - |  |  | - |  |  | - |  |  | 1,561,212 |  |  | 1,561,212 |
Year ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 5,558,769 |  |  | 2,621,581 |  |  | 1,262,458 |  |  | 3,081,126 |  |  | - |  |  | 12,523,934 |
Property, plant and equipment, net | 3,578,293 |  |  | 1,257,345 |  |  | 832,443 |  |  | 453,390 |  |  | - |  |  | 6,121,471 |
Intangible Assets, net | 1,117,314 |  |  | 177,934 |  |  | 14,899 |  |  | 47,602 |  |  | - |  |  | 1,357,749 |
Right of Use Assets, net | 65,105 |  |  | 8,255 |  |  | 28,242 |  |  | 47,266 |  |  | - |  |  | 148,868 |
Investments in non-consolidated companies | - |  |  | - |  |  | - |  |  | - |  |  | 1,543,657 |  |  | 1,543,657 |
Year ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 7,765,130 |  |  | 3,382,495 |  |  | 1,175,581 |  |  | 2,545,654 |  |  | - |  |  | 14,868,860 |
Property, plant and equipment, net | 3,676,352 |  |  | 1,143,752 |  |  | 794,242 |  |  | 463,833 |  |  | - |  |  | 6,078,179 |
Intangible Assets, net | 1,126,774 |  |  | 166,450 |  |  | 22,580 |  |  | 61,306 |  |  | - |  |  | 1,377,110 |
Right of Use Assets, net | 50,128 |  |  | 9,241 |  |  | 24,832 |  |  | 47,937 |  |  | - |  |  | 132,138 |
Investments in non-consolidated companies | - |  |  | - |  |  | - |  |  | - |  |  | 1,608,804 |  |  | 1,608,804 |
(*) | For the years 202 5, 20 2 4 and 20 2 3 includes Investment s in non-consolidated companies. See n ote 14 to these Consolidated Financial Statements.
Tubes [member] |
Disclosure of operating segments [line items] |
Segment revenues by market [text block] |
Revenues Tubes | 2025 |  |  | 2024 |  |  | 2023 |
Oil & gas | 10,172 |  |  | 10,689 |  |  | 12,488 |
Oil & gas processing plants | 557 |  |  | 548 |  |  | 818 |
Industrial, power & others | 671 |  |  | 670 |  |  | 879 |
Total | 11,400 |  |  | 11,907 |  |  | 14,185 |

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