v3.26.1
MATTERS RELATED TO THE ARGENTINE SUBSIDIARIES - (Narrative) (Details)
T in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jan. 14, 2026
USD ($)
vote
T
shares
Dec. 12, 2025
USD ($)
Disclosure of subsidiaries [line items]          
Net sales $ 15,609,094 $ 17,649,060 $ 17,610,092    
Assets 23,615,091 23,128,547      
Liabilities 7,467,345 6,996,978      
Capital and reserves attributable to the owners of the parent 11,944,300 11,968,186      
Financial assets 5,214,300 5,864,199      
Financial liabilities 5,105,833 4,767,651      
Dividends payable 8,677 1,967      
Major business combination | Tubos Argentinos S.A. | Ternium Argentina S.A.          
Disclosure of subsidiaries [line items]          
Cash transferred       $ 24,400  
Number of shares acquired through business combination (in shares) | shares       44,148,349  
Votes per share acquired | vote       1  
Percentage of voting equity interests acquired       100.00%  
Liabilities incurred       $ 8,200  
Business combination, annual sales of acquiree | T       42  
Ternium Argentina S.A.          
Disclosure of subsidiaries [line items]          
Net sales 2,018,000 2,212,000      
Profit (loss) from continuing operations 85,000 149,000      
Assets 5,181,000 5,726,000      
Liabilities 499,000 790,000      
Capital and reserves attributable to the owners of the parent 4,682,000 $ 4,936,000      
Cash and cash equivalents and other investments 803,000        
Financial assets 177,000        
Financial liabilities 126,000        
Dividends payable         $ 300,000
Ternium Argentina S.A. | Sovereign Bonds          
Disclosure of subsidiaries [line items]          
Cash and cash equivalents and other investments 700,000        
Ternium Argentina S.A. | Argentine Pesos-Denominated Instruments          
Disclosure of subsidiaries [line items]          
Cash and cash equivalents and other investments 93,000        
Ternium Argentina S.A. | Negotiable Obligations And Promissory Notes          
Disclosure of subsidiaries [line items]          
Cash and cash equivalents and other investments $ 10,000