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SEGMENT INFORMATION (Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 03, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]        
Operating income   $ 1,263,311 $ 2,198,014 $ 2,699,519
Differences in Cost of sales   14,760,224 14,050,737 12,487,282
Differences in Other operating income (expense), net   25,234 110,337 (84,019)
Financial income (expense), net   (295,859) (6,179) (98,541)
Equity in earnings of non-consolidated companies   69,108 105,305 37,114
Income before income tax expense - IFRS   728,005 1,320,782 2,666,500
Net sales   17,649,060 17,610,092 16,414,466
Usiminas        
Disclosure of operating segments [line items]        
Provision for ongoing litigation related to the acquisition of a participation in Usiminas   (410,200) 0 0
Net sales   4,803,000 5,534,000  
Usiminas        
Disclosure of operating segments [line items]        
Effect related to the increase of the participation in Usiminas $ (171,045) 0 (171,045) 0
Effect related to the increase of the participation in Usiminas   0 (934,946) 0
Ternium        
Disclosure of operating segments [line items]        
Operating income   1,399,920 2,404,174 2,571,165
Financial income (expense), net   (194,214) 123,454 (70,133)
Equity in earnings of non-consolidated companies   69,108 105,305 37,114
Income before income tax expense - IFRS   728,005 1,320,782 2,666,500
Depreciation and amortization   (743,277) (657,692) (616,492)
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   17,649,060 17,610,092 16,414,466
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   5,844 (2,463) 10,500
Depreciation and amortization   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   (629,940) (546,038) (410,636)
Ternium | Reconciling items        
Disclosure of operating segments [line items]        
Differences in Cost of sales   (190,243) (206,160) 128,354
Differences in Other operating income (expense), net   53,634    
Ternium | Steel | Operating segments        
Disclosure of operating segments [line items]        
Operating income   1,559,938 2,390,546 2,556,949
Depreciation and amortization   (551,621) (542,295) (523,818)
Ternium | Steel | Operating segments | External Customers        
Disclosure of operating segments [line items]        
Net sales   17,220,220 17,280,993 16,414,334
Ternium | Steel | Operating segments | Other Operating Segments Of The Same Entity        
Disclosure of operating segments [line items]        
Net sales   0 0 0
Ternium | Mining | Operating segments        
Disclosure of operating segments [line items]        
Operating income   (165,862) 16,091 3,716
Depreciation and amortization   (191,656) (115,397) (92,674)
Ternium | Mining | Operating segments | External Customers        
Disclosure of operating segments [line items]        
Net sales   428,840 329,099 132
Ternium | Mining | Operating segments | Other Operating Segments Of The Same Entity        
Disclosure of operating segments [line items]        
Net sales   $ 629,940 $ 546,038 $ 410,636