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Schedule of share repurchase programs of subsidiary CSN Mineracao (Details)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
R$ / shares
shares
IfrsStatementLineItems [Line Items]  
Sale of shares | shares 105,407,300
Treasury balance | R$ R$ 651,017,574
First Program [Member]  
IfrsStatementLineItems [Line Items]  
Boards authorization Mar. 24, 2021
Authorized quantity | shares 58,415,015
Description of program period rom 3/25/2021 to 9/24/2021
Repurchase average buyback price R$ 6.1451
Minimum buyback price 5.5825
Maximum buyback price R$ 6.7176
Sale of shares | shares 52,940,500
Treasury balance | R$ R$ 325,324,667
Second Program [Member]  
IfrsStatementLineItems [Line Items]  
Boards authorization Nov. 03, 2021
Authorized quantity | shares 53,000,000
Description of program period from 11/04/2021 to 9/24/2022
Repurchase average buyback price R$ 6.2076
Minimum buyback price 5.0392
Maximum buyback price R$ 6.1208
Sale of shares | shares 52,466,800
Treasury balance | R$ R$ 325,692,908