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22. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]    
Borrowings R$ 23,205,332 R$ 15,695,779
Tax foreclosure 35,692 41,004
Others 5,462 10,857
Total 23,246,486 15,747,640
Local currency [member]    
Disclosure of transactions between related parties [line items]    
Borrowings 19,877,378 12,033,973
Tax foreclosure
Others
Total 19,877,378 12,033,973
Guarantees [member] | Foreign currency [member] | Euro [member]    
Disclosure of transactions between related parties [line items]    
Borrowings 24,000
Total 24,000
Guarantees [member] | Foreign currency [member] | Euro [member] | CSN steel s.l. [member]    
Disclosure of transactions between related parties [line items]    
Borrowings 24,000
Total 24,000
Guarantees [member] | Foreign currency [member] | USD    
Disclosure of transactions between related parties [line items]    
Borrowings 3,825,000 2,958,603
Tax foreclosure
Others
Total R$ 3,825,000 2,958,603
Guarantees [member] | Foreign currency [member] | USD | CSN islands XII [member]    
Disclosure of transactions between related parties [line items]    
Maturities Perpetual  
Borrowings R$ 1,000,000 1,000,000
Tax foreclosure
Others
Total R$ 1,000,000 1,000,000
Guarantees [member] | Foreign currency [member] | USD | CSN resources [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 04/17/2026  
Borrowings R$ 1,525,000 1,958,603
Tax foreclosure
Others
Total R$ 1,525,000 1,958,603
Guarantees [member] | Foreign currency [member] | USD | CSN inova ventures [member]    
Disclosure of transactions between related parties [line items]    
Maturities 1/28/2028  
Borrowings R$ 1,300,000
Total 1,300,000
Guarantees [member] | Local currency [member]    
Disclosure of transactions between related parties [line items]    
Borrowings 3,327,954 3,661,806
Tax foreclosure 35,692 41,004
Others 5,462 10,857
Total R$ 3,369,108 3,713,667
Guarantees [member] | Local currency [member] | Transnordestina logistica s.a [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 09/19/2056 and Indefinite  
Borrowings R$ 2,478,105 2,428,194
Tax foreclosure 35,496 37,406
Others 3,298 8,702
Total R$ 2,516,899 2,474,302
Guarantees [member] | Local currency [member] | FTL - ferrovia transnordestina [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 04/01/2021  
Borrowings 43,118
Tax foreclosure
Others
Total 43,118
Guarantees [member] | Local currency [member] | Cia metalurgica prada [member]    
Disclosure of transactions between related parties [line items]    
Maturities Indefinite  
Tax foreclosure R$ 196 457
Others 244 235
Total R$ 440 692
Guarantees [member] | Local currency [member] | CSN energia [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 11/26/2023 and indefinite  
Tax foreclosure 3,141
Others 1,920 1,920
Total R$ 1,920 5,061
Guarantees [member] | Local currency [member] | CSN mineracao [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 12/21/2024  
Borrowings R$ 846,749 1,184,048
Tax foreclosure
Others
Total R$ 846,749 1,184,048
Guarantees [member] | Local currency [member] | Estanho de rondonia [member]    
Disclosure of transactions between related parties [line items]    
Maturities 7/15/2022  
Borrowings R$ 1,154 1,902
Total R$ 1,154 1,902
Guarantees [member] | Local currency [member] | Minerios nacional s.a. [member]    
Disclosure of transactions between related parties [line items]    
Maturities Up to 09/10/2021  
Borrowings R$ 1,946 4,544
Tax foreclosure
Others
Total R$ 1,946 R$ 4,544