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20 PAYMENT TO SHAREHOLDERS (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
May 29, 2019
Dec. 31, 2019
PaymentToShareholdersLineItems [Line Items]    
Dividend R$ 898,332 R$ 1,855,289
Interest on equity   65,020
Total   1,920,309
Controlling Shareholders [Member]    
PaymentToShareholdersLineItems [Line Items]    
Dividend   1,309,983
Total   1,309,983
Non-Controlling Shareholders [Member]    
PaymentToShareholdersLineItems [Line Items]    
Dividend [1]   545,306
Interest on equity [1]   65,020
Total [1]   R$ 610,326
[1] Refers to dividends and interest on equity distributed to minority shareholders of CSN Mineracao.