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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