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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Concession 1  
Disclosure of detailed information about service concession arrangements [line items]  
Concession name Sepetiba Tecon S.A. (TECON)
Net book value R$ 347,000
Classification in balance sheet Fixed assets and intangible (Software)
Concession 2  
Disclosure of detailed information about service concession arrangements [line items]  
Concession name Tecar (CSN Mineração)
Net book value R$ 1,616,000
Classification in balance sheet Fixed assets and intangible (Software)
Concession 3  
Disclosure of detailed information about service concession arrangements [line items]  
Concession name FTL - Ferrovia Transnordestina Logística S.A. (FTL)
Net book value R$ 227,000
Classification in balance sheet Fixed assets
Concession 4  
Disclosure of detailed information about service concession arrangements [line items]  
Concession name Transnordestina logística S.A. (TLSA)
Net book value R$ 8,439,000
Classification in balance sheet Investment