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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholder claims, Mexican income tax adjustment & Argentine tax claim) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2021
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of contingent liabilities [line items]          
Adjustments for current tax of prior periods     $ 0 $ (13,429) $ 0
Mexican Tax Authority | Ternium Mexico          
Disclosure of contingent liabilities [line items]          
Adjustments for current tax of prior periods $ 53,300        
Mexican Tax Authority | 2008 | Ternium Mexico          
Disclosure of contingent liabilities [line items]          
Increase in contingent tax liability     17,500    
Mexican Tax Authority | 2011 | Ternium Mexico          
Disclosure of contingent liabilities [line items]          
Increase in contingent tax liability     $ 35,800    
Domestic Tax Authority | Mexican Tax Authority | 2008 | Ternium Mexico          
Disclosure of contingent liabilities [line items]          
Tax contingent liability   $ 72,800      
Domestic Tax Authority | Mexican Tax Authority | 2011 | Ternium Mexico          
Disclosure of contingent liabilities [line items]          
Tax contingent liability   $ 35,600