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BORROWINGS (Significant borrowings) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2018
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 1,479,038,000 $ 1,722,893,000  
Tenigal Syndicated Loan Due July 2022      
Disclosure of detailed information about borrowings [line items]      
Original principal amount 200,000,000    
Borrowings 25,000,000    
Ternium Investments S.à r.l Syndicated Loan Due September 2022      
Disclosure of detailed information about borrowings [line items]      
Original principal amount 1,500,000,000    
Borrowings 375,000,000    
Ternium Mexico Syndicated Loan Due June 2023      
Disclosure of detailed information about borrowings [line items]      
Original principal amount 1,000,000,000   $ 1,000,000,000
Borrowings 250,000,000    
Ternium Brazil Syndicated Loan Due August 2024      
Disclosure of detailed information about borrowings [line items]      
Original principal amount 500,000,000    
Borrowings $ 500,000,000