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9. INVESTMENTS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]        
Assets R$ 47,327,524 R$ 45,209,970    
Shareholders' equity 10,013,440 8,288,229 R$ 7,384,521 R$ 7,091,288
Fair Value Allocation 271,116 271,116    
Profit (loss) for the year (5,200,583) (111,229) R$ 853,058  
Classified as available for sale        
Usiminas 2,250,623 2,200,459    
Panatlantica 28,566 21,974    
Classified as available for sale 2,279,189 2,222,433    
Others investments        
Others investments 112 76    
Total Investments R$ 5,359,497 R$ 5,228,879    
Joint Venture/Joint Operation 1        
Disclosure of fair value measurement of assets [line items]        
Joint venture and joint operation name MRS Logística S.A.      
Number of common shares held by CSN 126,716,070      
Direct equity interest, joint venture and joint operation 37.27% 37.27%    
Assets R$ 3,125,912 R$ 3,039,761    
Liabilities 1,693,200 1,714,729    
Shareholders' equity 1,878,095 1,782,162    
Profit (loss) for the year R$ 194,403 R$ 171,905    
Joint Venture/Joint Operation 2        
Disclosure of fair value measurement of assets [line items]        
Joint venture and joint operation name CBSI - Companhia Brasileira de Serviços de Infraestrutura      
Number of common shares held by CSN 1,876,146      
Direct equity interest, joint venture and joint operation 50.00% 50.00%    
Assets R$ 25,941 R$ 16,005    
Liabilities 19,997 13,654    
Shareholders' equity 5,944 2,351    
Profit (loss) for the year R$ 4,501 R$ 1,785    
Joint Venture/Joint Operation 3        
Disclosure of fair value measurement of assets [line items]        
Joint venture and joint operation name Transnordestina Logística S.A.      
Number of common shares held by CSN 24,168,304      
Direct equity interest, joint venture and joint operation 46.30% 46.28%    
Assets R$ 4,065,604 R$ 3,806,380    
Liabilities 2,883,851 2,604,198    
Shareholders' equity 1,181,753 1,202,182    
Fair Value Allocation 271,116 271,116    
Profit (loss) for the year (20,429) (21,357)    
Joint Venture/Joint Operation        
Disclosure of fair value measurement of assets [line items]        
Assets 7,217,457 6,862,146    
Liabilities 4,597,048 4,332,581    
Shareholders' equity 3,065,792 2,986,695    
Fair Value Allocation 271,116 271,116    
Profit (loss) for the year R$ 178,475 R$ 152,333    
Associate 1        
Disclosure of fair value measurement of assets [line items]        
Associate name Arvedi Metalfer do Brasil      
Number of common shares held by CSN 46,994,971      
Direct equity interest, associate 20.00% 20.00%    
Assets R$ 40,712 R$ 43,653    
Liabilities 26,308 23,978    
Shareholders' equity 14,404 19,675    
Profit (loss) for the year (5,087) (4,368)    
Associate        
Disclosure of fair value measurement of assets [line items]        
Assets 40,712 43,653    
Liabilities 26,308 23,978    
Shareholders' equity 14,404 19,675    
Profit (loss) for the year R$ (5,087) R$ (4,368)