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FOREIGN EXCHANGE RESTRICTIONS IN ARGENTINA - (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]        
Net sales $ 16,414,466 $ 16,090,744 $ 8,735,435  
Assets 17,491,548 17,097,907    
Total Liabilities 3,723,155 4,862,869    
Usiminas' shareholders' equity 13,768,393 12,235,038 $ 8,443,153 $ 7,714,873
Financial assets 5,007,447 4,607,991    
Financial liabilities 2,438,751 2,875,591    
Ternium Argentina S.A.        
Disclosure of subsidiaries [line items]        
Net sales 3,830,000 3,425,000    
Profit (loss) from continuing operations 756,000 930,000    
Assets 5,258,000 4,798,000    
Total Liabilities 511,000 541,000    
Usiminas' shareholders' equity 4,747,000 $ 4,257,000    
Cash and cash equivalents and other investments 1,363,000      
Financial assets 261,000      
Financial liabilities 254,000      
Ternium Argentina S.A. | Argentine Pesos-Denominated Instruments        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments 145,000      
Ternium Argentina S.A. | Deposit certificates        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments 66,000      
Ternium Argentina S.A. | Sovereign Bonds        
Disclosure of subsidiaries [line items]        
Cash and cash equivalents and other investments $ 1,152,000