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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details)
$ in Thousands, T in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
T
km
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Aug. 05, 2021
USD ($)
Feb. 28, 2019
Disclosure of unconsolidated structured entities [line items]              
Net sales   $ 17,649,060 $ 17,610,092 $ 16,414,466      
Non-current assets $ 12,148,560 12,050,457 12,148,560        
Current assets 12,030,544 11,078,090 12,030,544        
Non-current liabilities 3,566,643 3,157,819 3,566,643        
Current liabilities 3,800,602 3,839,159 3,800,602        
Equity 16,811,859 16,131,569 16,811,859 $ 13,768,393 $ 12,235,038    
Borrowings 2,146,414 2,230,119 2,146,414        
Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Net sales 37,000 68,000          
Profit (loss) from continuing operations 17,000 28,000          
Non-current assets 163,000 126,000 163,000        
Current assets 40,000 35,000 40,000        
Non-current liabilities 48,000 38,000 48,000        
Current liabilities 11,000 9,000 11,000        
Equity 143,000 $ 114,000 143,000        
Number of tons | T   1,030          
Usiminas | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   11.48%          
Net sales 727,000 $ 1,304,000          
Profit (loss) from continuing operations 148,000 263,000          
Non-current assets 2,779,000 2,461,000 2,779,000        
Current assets 954,000 868,000 954,000        
Non-current liabilities 1,709,000 1,576,000 1,709,000        
Current liabilities 704,000 547,000 704,000        
Equity 1,320,000 $ 1,206,000 1,320,000        
Usiminas | Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   70.00%          
Nippon Steel Corporation | Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   30.00%          
CSN | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   18.60%          
Congonhas Minérios | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   18.60%          
Vale S.A. | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   10.90%          
Gerdau              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   1.30%          
Wide Group of Small Investors | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   6.50%          
MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Number of networks managed | km   1,634          
Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments              
Disclosure of unconsolidated structured entities [line items]              
Payment for purchase of participation in borrowing arrangement           $ 68,000  
Techgen S.A. de C.V.              
Disclosure of unconsolidated structured entities [line items]              
Number of megawatts (per year) | MW   900          
Net sales   $ 253,000 444,000        
Profit (loss) from continuing operations   27,000 55,000        
Non-current assets 766,000 692,000 766,000        
Current assets 175,000 104,000 175,000        
Non-current liabilities 466,000 415,000 466,000        
Current liabilities 232,000 109,000 232,000        
Equity $ 243,000 272,000 $ 243,000        
Subordinated liabilities   $ 148,400          
Techgen S.A. de C.V. | Ternium S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   48.00%          
Proportion of ownership interest in associate's power supply (percent)   78.00%          
Techgen S.A. de C.V. | Tecpetrol International S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   30.00%          
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026              
Disclosure of unconsolidated structured entities [line items]              
Debt instrument, average life             4 years 3 months 18 days
Debt instrument, percentage of debt service reserve account             10.00%
Borrowings   $ 188,000          
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments              
Disclosure of unconsolidated structured entities [line items]              
Payment for purchase of participation in borrowing arrangement   $ 39,000          
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | London Interbank Offered Rate (LIBOR) | Techgen S.A. de C.V. Syndicated Loan Due February 2026              
Disclosure of unconsolidated structured entities [line items]              
Borrowings, adjustment to interest rate basis             1.70%
Techgen S.A. de C.V. | Tenaris Investments              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   22.00%          
Proportion of ownership interest in associate's power supply (percent)   22.00%