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Schedule of guarantees (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Borrowings R$ 18,680,356 R$ 23,205,332
Tax foreclosure 12,824 35,692
Others 485,933 5,462
Total 19,179,113 23,246,486
Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 15,346,375 19,877,378
Others 479,795  
Total 15,826,170 19,877,378
Guarantees [member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,333,981 3,327,954
Tax foreclosure 12,824 35,692
Others 6,138 5,462
Total 3,352,943 3,369,108
Guarantees [member] | Foreign Currency [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Borrowings 2,750,000 3,825,000
Others 1,025  
Total 2,751,025 3,825,000
Guarantees [member] | Foreign Currency [Member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Others 75,000  
Total R$ 75,000  
Guarantees [member] | Transnordestina Logistica S A [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 09/19/2056 and Indefinite  
Borrowings R$ 2,486,926 2,478,105
Tax foreclosure 12,627 35,496
Others 3,384 3,298
Total R$ 2,502,937 2,516,899
Guarantees [member] | C S N Cimentos [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 11/26/2023 and indefinite  
Others R$ 33  
Total R$ 33  
Guarantees [member] | C S N Cimentos [Member] | Foreign Currency [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Others R$ 1,025  
Total R$ 1,025  
Guarantees [member] | Cia Siderurgica Nacional [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities 05/31/2025  
Others R$ 536  
Total R$ 536  
Guarantees [member] | Cia Metalurgica Prada [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Tax foreclosure R$ 197 196
Others 244 244
Total R$ 441 440
Guarantees [member] | C S N Energia [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 11/26/2023 and indefinite  
Others R$ 1,920 1,920
Total R$ 1,920 1,920
Guarantees [member] | C S N Mineracao [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 12/21/2024  
Borrowings R$ 846,284 846,749
Total R$ 846,284 846,749
Guarantees [member] | C B S [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities 06/30/2024  
Others R$ 21  
Total R$ 21  
Guarantees [member] | Estanho De Rondonia [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities 7/15/2022  
Borrowings R$ 771 1,154
Total R$ 771 1,154
Guarantees [member] | Minerios Nacional S A [Member] | Local Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 09/10/2021  
Borrowings   1,946
Total   1,946
Guarantees [member] | C S N Inova Ventures [Member] | Foreign Currency [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities 01/28/2028  
Borrowings R$ 1,300,000 1,300,000
Total R$ 1,300,000 1,300,000
Guarantees [member] | C S N Islands X I I [Member] | Foreign Currency [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities Perpetual  
Borrowings   1,000,000
Total   1,000,000
Guarantees [member] | C S N Resources [Member] | Foreign Currency [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities Up to 04/17/2026  
Borrowings R$ 1,450,000 1,525,000
Total R$ 1,450,000 R$ 1,525,000
Guarantees [member] | Lusosider Acos Planos [Member] | Foreign Currency [Member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Others R$ 75,000  
Total R$ 75,000