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SEGMENT INFORMATION (Segment reporting information, by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Operating income $ 2,699,519 $ 5,271,136 $ 1,079,473
Cost of sales 12,487,282 9,895,070 7,099,923
Financial income (expense), net (98,541) 56,547 19,554
Equity in earnings of non-consolidated companies 37,114 400,732 57,555
Income before income tax expense - IFRS 2,666,500 5,764,330 1,159,359
Net sales 16,414,466 16,090,744 8,735,435
Ternium      
Disclosure of operating segments [line items]      
Operating income 2,571,165 4,415,791 1,149,249
Financial income (expense), net (70,133) 92,462 22,331
Equity in earnings of non-consolidated companies 37,114 400,732 57,555
Income before income tax expense - IFRS 2,666,500 5,764,330 1,159,359
Depreciation and amortization (616,492) (591,790) (631,051)
Ternium | External Customers      
Disclosure of operating segments [line items]      
Net sales 16,414,466 16,090,744 8,735,435
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 10,500 1,586 689
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 (410,636) (478,559) (334,619)
Ternium | Reconciling items      
Disclosure of operating segments [line items]      
Cost of sales 128,354 855,345 (69,776)
Ternium | Steel | Operating segments      
Disclosure of operating segments [line items]      
Operating income 2,556,949 4,210,135 1,046,623
Depreciation and amortization (523,818) (528,144) (580,807)
Ternium | Steel | Operating segments | External Customers      
Disclosure of operating segments [line items]      
Net sales 16,414,334 16,043,033 8,679,513
Ternium | Steel | Operating segments | Other Operating Segments Of The Same Entity      
Disclosure of operating segments [line items]      
Net sales
Ternium | Mining | Operating segments      
Disclosure of operating segments [line items]      
Operating income 3,716 204,070 101,937
Depreciation and amortization (92,674) (63,646) (50,244)
Ternium | Mining | Operating segments | External Customers      
Disclosure of operating segments [line items]      
Net sales 132 47,711 55,922
Ternium | Mining | Operating segments | Other Operating Segments Of The Same Entity      
Disclosure of operating segments [line items]      
Net sales $ 410,636 $ 478,559 $ 334,619