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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 ($)
T
km
Dec. 31, 2023
USD ($)
T
km
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Aug. 05, 2021
USD ($)
Dec. 31, 2020
USD ($)
Feb. 28, 2019
Disclosure of unconsolidated structured entities [line items]              
Net sales   $ 17,610,092 $ 16,414,466 $ 16,090,744      
Non-current assets $ 12,148,560 12,148,560 8,647,510        
Current assets 12,030,544 12,030,544 8,844,038        
Non-current liabilities 3,566,643 3,566,643 1,506,325        
Current liabilities 3,800,602 3,800,602 2,216,830        
Equity 16,811,859 16,811,859 13,768,393 $ 12,235,038   $ 8,443,153  
Borrowings 2,146,414 2,146,414 1,031,865        
Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Net sales 37,000            
Profit (loss) from continuing operations 17,000            
Non-current assets 163,000 163,000          
Current assets 40,000 40,000          
Non-current liabilities 48,000 48,000          
Current liabilities 11,000 11,000          
Equity $ 143,000 $ 143,000          
Number of tons | T 1,030 1,030          
MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Number of networks managed | km 1,634 1,634          
Usiminas | MRS Logística S.A.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   11.41%          
Net sales $ 727,000            
Profit (loss) from continuing operations 148,000            
Non-current assets 2,779,000 $ 2,779,000          
Current assets 954,000 954,000          
Non-current liabilities 1,709,000 1,709,000          
Current liabilities 704,000 704,000          
Equity 1,320,000 $ 1,320,000          
Usiminas | Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   70.00%          
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%          
Nippon Steel Corporation | Unigal Usiminas Ltda.              
Disclosure of unconsolidated structured entities [line items]              
Proportion of ownership interest in associate (percent)   30.00%          
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   $ 444,000 580,000        
Profit (loss) from continuing operations   55,000 55,000        
Non-current assets 766,000 766,000 766,000        
Current assets 175,000 175,000 131,000        
Non-current liabilities 466,000 466,000 527,000        
Current liabilities 232,000 232,000 181,000        
Equity 243,000 243,000 $ 189,000        
Subordinated liabilities 136,300 $ 136,300          
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. | Ternium Investments S.à.r.l.              
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%          
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 267,000 $ 267,000          
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 $ 55,000 $ 55,000          
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%