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FOREIGN EXCHANGE RESTRICTIONS IN ARGENTINA - (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Apr. 24, 2023
Disclosure of subsidiaries [line items]        
Net sales $ 17,649,060 $ 17,610,092 $ 16,414,466  
Assets 23,128,547 24,179,104    
Liabilities 6,996,978 7,367,245    
Capital and reserves attributable to the owners of the parent 11,968,186 12,418,595    
Financial assets 5,864,199 6,585,722    
Financial liabilities 4,767,651 5,043,160    
Dividends payable 1,967 51,249    
Ternium Argentina S.A.        
Disclosure of subsidiaries [line items]        
Net sales 2,212,000 3,419,000    
Profit (loss) from continuing operations 149,000 686,000    
Assets 5,726,000 5,083,000    
Liabilities 790,000 759,000    
Capital and reserves attributable to the owners of the parent 4,936,000 $ 4,324,000    
Cash and cash equivalents and other investments 1,293,000      
Financial assets 218,000      
Financial liabilities 184,000      
Dividends payable       $ 624,000
Ternium Argentina S.A. | Sovereign Bonds        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments 1,275,000      
Ternium Argentina S.A. | Argentine Pesos-Denominated Instruments        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments 17,000      
Ternium Argentina S.A. | Negotiable Obligations And Promissory Notes        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments $ 1,000