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SEGMENT INFORMATION (Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 03, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | $ 2,198,014 | $ 2,699,519 | $ 5,271,136
Cost of sales |  | 14,050,737 | 12,487,282 | 9,895,070
Financial income (expense), net |  | (6,179) | (98,541) | 56,547
Equity in earnings of non-consolidated companies |  | 105,305 | 37,114 | 400,732
Recycling of other comprehensive income related to Usiminas |  | 1,320,782 | 2,666,500 | 5,764,330
Net sales |  | 17,610,092 | 16,414,466 | 16,090,744
Usiminas |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Effect related to the increase of the participation in Usiminas | $ (171,045) | (171,045) | 0 | 0
Recycling of other comprehensive income related to Usiminas |  | (934,946) | 0 | 0
Ternium |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | 2,404,174 | 2,571,165 | 4,415,791
Financial income (expense), net |  | 123,454 | (70,133) | 92,462
Equity in earnings of non-consolidated companies |  | 105,305 | 37,114 | 400,732
Recycling of other comprehensive income related to Usiminas |  | 1,320,782 | 2,666,500 | 5,764,330
Net sales from transactions with other operating segments of the same entity |  | (657,693) | (616,492) | (591,790)
Ternium | Usiminas |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Effect related to the increase of the participation in Usiminas |  | (171,045) |  |
Ternium | External Customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 17,610,092 | 16,414,466 | 16,090,744
Ternium | Other Operating Segments Of The Same Entity |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 0 | 0 | 0
Ternium | Inter-segment eliminations |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | (6,401) | 10,500 | 1,586
Net sales from transactions with other operating segments of the same entity |  | 0 | 0 | 0
Ternium | Inter-segment eliminations | External Customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 0 | 0 | 0
Ternium | Inter-segment eliminations | Other Operating Segments Of The Same Entity |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | (817,046) | (410,636) | (478,559)
Ternium | Reconciling items |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Cost of sales |  | (206,160) | 128,354 | 855,345
Ternium | Steel | Operating segments |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | 2,404,189 | 2,556,949 | 4,210,135
Net sales from transactions with other operating segments of the same entity |  | (520,328) | (523,818) | (528,144)
Ternium | Steel | Operating segments | External Customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 14,909,209 | 16,414,334 | 16,043,033
Ternium | Steel | Operating segments | Other Operating Segments Of The Same Entity |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 285,025 | 0 | 0
Ternium | Mining | Operating segments |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | (58,037) | 3,716 | 204,070
Net sales from transactions with other operating segments of the same entity |  | (107,546) | (92,674) | (63,646)
Ternium | Mining | Operating segments | External Customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 96 | 132 | 47,711
Ternium | Mining | Operating segments | Other Operating Segments Of The Same Entity |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 500,401 | 410,636 | 478,559
Ternium | Usiminas | Operating segments |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating income |  | 64,423 | 0 | 0
Net sales from transactions with other operating segments of the same entity |  | (29,819) | 0 | 0
Ternium | Usiminas | Operating segments | External Customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | 2,700,787 | 0 | 0
Ternium | Usiminas | Operating segments | Other Operating Segments Of The Same Entity |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  | $ 31,620 | $ 0 | $ 0

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