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8. INVESTMENTS (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of fair value measurement of assets [line items]        
Assets R$ 45,209,970 R$ 44,153,623    
Shareholders' equity 8,288,229 7,384,521 R$ 7,091,288 R$ 5,734,975
Profit (loss) for the year (111,229) 853,058 R$ 1,215,964  
Classified as available for sale        
Usiminas 2,200,459 1,353,664    
Panatlantica 21,974 20,604    
Classified as available for sale 2,222,433 1,374,268    
Classification of investments in the balance sheet        
Investments in assets 22,894,885 22,703,508    
Investment with short term liabilites R$ (1,366,480) R$ (1,019,299)    
Subsidiary 1        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name CSN Islands VII Corp.      
Number of common shares held by CSN 20,001,000      
Direct equity interest, subsidiary 100.00% 100.00%    
Assets R$ 5,242,890 R$ 6,436,140    
Liabilities 5,421,043 6,228,374    
Shareholders' equity (178,153) 207,766    
Profit (loss) for the year R$ (385,919) 167,767    
Subsidiary 2        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [1] CSN Islands IX Corp.      
Profit (loss) for the year [1]   R$ (388)    
Subsidiary 3        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name CSN Islands XI Corp.      
Number of common shares held by CSN 50,000      
Direct equity interest, subsidiary 100.00% 100.00%    
Assets R$ 2,514,894 R$ 2,530,563    
Liabilities 2,557,398 2,509,866    
Shareholders' equity (42,504) 20,697    
Profit (loss) for the year R$ (63,201) R$ (1,295)    
Subsidiary 4        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name CSN Islands XII Corp.      
Number of common shares held by CSN 1,540      
Direct equity interest, subsidiary 100.00% 100.00%    
Assets R$ 2,166,682 R$ 2,244,240    
Liabilities 3,312,505 3,263,539    
Shareholders' equity (1,145,823) (1,019,299)    
Profit (loss) for the year R$ (126,524) R$ 75,787    
Subsidiary 5        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [2] CSN Minerals S.L.U.      
Direct equity interest, subsidiary [2]   100.00%    
Assets [2]   R$ 3,833,669    
Liabilities [2]   9,840    
Shareholders' equity [2]   3,823,829    
Profit (loss) for the year [2] R$ 331,897 R$ (927,265)    
Subsidiary 6        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [2] CSN Export Europe, S.L.U.      
Direct equity interest, subsidiary [2]   100.00%    
Assets [2]   R$ 666,362    
Liabilities [2]   30,077    
Shareholders' equity [2]   636,285    
Profit (loss) for the year [2] R$ 22,600 R$ (185,057)    
Subsidiary 7        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [2] CSN Metals S.L.U.      
Direct equity interest, subsidiary [2]   100.00%    
Assets [2]   R$ 636,408    
Liabilities [2]   20,668    
Shareholders' equity [2]   615,740    
Profit (loss) for the year [2] R$ 23,188 R$ (175,236)    
Subsidiary 8        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [2] CSN Americas S.L.U.      
Direct equity interest, subsidiary [2]   100.00%    
Assets [2]   R$ 1,492,678    
Liabilities [2]   4,445    
Shareholders' equity [2]   1,488,233    
Profit (loss) for the year [2] R$ 193,652 R$ (220,412)    
Subsidiary 9        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [2] CSN Steel S.L.U.      
Number of common shares held by CSN [2] 22,042,688      
Direct equity interest, subsidiary [2] 100.00% 100.00%    
Assets [2] R$ 6,905,164 R$ 2,537,179    
Liabilities [2] 322,963 1,585,977    
Shareholders' equity [2] 6,582,201 951,202    
Profit (loss) for the year [2] R$ 108,427 R$ 323,043    
Subsidiary 10        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Sepetiba Tecon S.A.      
Number of common shares held by CSN 254,015,052      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 459,647 R$ 441,214    
Liabilities 160,402 165,172    
Shareholders' equity 299,245 276,042    
Profit (loss) for the year R$ 29,768 R$ 22,794    
Subsidiary 11        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Minérios Nacional S.A.      
Number of common shares held by CSN 66,393,587      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 105,586 R$ 74,738    
Liabilities 65,290 28,038    
Shareholders' equity 40,296 46,700    
Profit (loss) for the year R$ (13,600) (12,548)    
Subsidiary 12        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Fair Value - Minérios Nacional      
Shareholders' equity R$ 2,123,507 R$ 2,123,507    
Subsidiary 13        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Estanho de Rondônia S.A.      
Number of common shares held by CSN 121,861,697      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 46,005 R$ 32,816    
Liabilities 41,032 21,552    
Shareholders' equity 4,973 11,264    
Profit (loss) for the year R$ (6,291) R$ (13,061)    
Subsidiary 14        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Companhia Metalúrgica Prada      
Number of common shares held by CSN 313,651,399      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 655,748 R$ 769,337    
Liabilities 485,915 620,509    
Shareholders' equity 169,833 148,828    
Profit (loss) for the year R$ (29,258) R$ (45,783)    
Subsidiary 15        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name CSN Mineração S.A.      
Number of common shares held by CSN 158,419,480      
Direct equity interest, subsidiary 87.52% 87.52%    
Assets R$ 14,273,290 R$ 13,039,767    
Liabilities 5,620,137 4,943,090    
Shareholders' equity 8,653,153 8,096,677    
Profit (loss) for the year R$ 767,568 R$ 580,146    
Subsidiary 16        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name CSN Energia S.A.      
Number of common shares held by CSN 43,149      
Direct equity interest, subsidiary 99.99% 100.00%    
Assets R$ 146,130 R$ 109,290    
Liabilities 55,030 39,654    
Shareholders' equity 91,100 69,636    
Profit (loss) for the year R$ 56,987 R$ 26,240    
Subsidiary 17        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name FTL - Ferrovia Transnordestina Logística S.A.      
Number of common shares held by CSN 395,302,149      
Direct equity interest, subsidiary 90.78% 90.78%    
Assets R$ 419,388 R$ 484,218    
Liabilities 138,888 126,334    
Shareholders' equity 280,500 357,884    
Profit (loss) for the year R$ (77,384) R$ (11,376)    
Subsidiary 18        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Companhia Florestal do Brasil      
Number of common shares held by CSN 41,673,302      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 34,910 R$ 35,206    
Liabilities 3,734 5,179    
Shareholders' equity 31,176 30,027    
Profit (loss) for the year R$ (1,499) R$ (2,215)    
Subsidiary 19        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Nordeste Logística      
Number of common shares held by CSN 99,999      
Direct equity interest, subsidiary 99.99% 99.99%    
Assets R$ 80 R$ 81    
Liabilities 55 55    
Shareholders' equity 25 26    
Profit (loss) for the year R$ (1) R$ (74)    
Subsidiary 20        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name [3] CGPAR - Construção Pesada S.A.      
Direct equity interest, subsidiary [3]   100.00%    
Assets [3]   R$ 40,889    
Liabilities [3]   27,558    
Shareholders' equity [3]   13,331    
Profit (loss) for the year [3] R$ 723 5,887    
Subsidiary 21        
Disclosure of fair value measurement of assets [line items]        
Subsidiary name Fair value fixed assets - CGPAR      
Shareholders' equity   53,949    
Profit (loss) for the year R$ (3,940) (3,940)    
Subsidiary Total        
Disclosure of fair value measurement of assets [line items]        
Profit (loss) for the year R$ 827,193 R$ (396,986)    
Joint Venture/Joint Operation 1        
Disclosure of fair value measurement of assets [line items]        
Joint venture and joint operation name Itá Energética S.A.      
Number of common shares held by CSN 253,606,846      
Direct equity interest, subsidiary 48.75%      
Direct equity interest, joint venture and joint operation   48.75%    
Assets R$ 265,476 R$ 282,383    
Liabilities 18,104 27,728    
Shareholders' equity 247,372 254,655    
Profit (loss) for the year R$ 10,789 R$ 8,591    
Joint Venture/Joint Operation 2        
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 26,611,282      
Number of preferred shares held by CSN 2,673,312      
Direct equity interest, subsidiary 18.64%      
Direct equity interest, joint venture and joint operation   18.64%    
Assets R$ 1,520,264 R$ 1,411,526    
Liabilities 857,581 795,903    
Shareholders' equity 662,683 615,623    
Profit (loss) for the year R$ 85,974 R$ 77,828    
Joint Venture/Joint Operation 3        
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, subsidiary 50.00%      
Direct equity interest, joint venture and joint operation   50.00%    
Assets R$ 16,005 R$ 13,574    
Liabilities 13,654 11,517    
Shareholders' equity 2,351 2,057    
Profit (loss) for the year R$ 1,785 R$ 2,953    
Joint Venture/Joint Operation 4        
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, subsidiary 46.28%      
Direct equity interest, joint venture and joint operation   49.02%    
Assets R$ 3,806,380 R$ 3,786,556    
Liabilities 2,604,198 2,566,315    
Shareholders' equity 1,202,182 1,220,241    
Profit (loss) for the year R$ (21,357) (52,127)    
Joint Venture/Joint Operation 5        
Disclosure of fair value measurement of assets [line items]        
Joint venture and joint operation name Fair Value allocated to TLSA in loss of control      
Shareholders' equity R$ 271,116 271,116    
Joint Venture/Joint Operation        
Disclosure of fair value measurement of assets [line items]        
Assets 5,608,125 5,494,039    
Liabilities 3,493,537 3,401,463    
Shareholders' equity 2,385,704 2,363,692    
Profit (loss) for the year R$ 77,191 R$ 37,245    
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, subsidiary 20.00%      
Direct equity interest, associate   20.00%    
Assets R$ 43,653 R$ 53,101    
Liabilities 23,978 48,258    
Shareholders' equity 19,675 4,843    
Profit (loss) for the year (4,368) 1,372    
Associate        
Disclosure of fair value measurement of assets [line items]        
Assets 43,653 53,101    
Liabilities 23,978 48,258    
Shareholders' equity 19,675 4,843    
Profit (loss) for the year (4,368) 1,372    
Subsidiary        
Disclosure of fair value measurement of assets [line items]        
Assets 32,970,414 35,404,795    
Liabilities 18,184,392 19,629,927    
Shareholders' equity 16,909,529 17,952,324    
Profit (loss) for the year 827,193 (396,986)    
Shareholders' Equity        
Others investments        
Revenue from subsidiares inventories (72,473) (74,459)    
Others 63,537 63,541    
Others investments (8,936) (10,918)    
Total Investments 21,528,405 21,684,209    
Classification of investments in the balance sheet        
Investments 21,528,405 21,684,209    
Profit (loss) for the year        
Others investments        
Revenue from subsidiares inventories 1,985 7,583    
Others (165) (19,557)    
Others investments 1,820 (11,974)    
Total Investments 901,836 (370,343)    
Classification of investments in the balance sheet        
Investments R$ 901,836 R$ (370,343)    
[1] Empresa liquidada em 2016
[2] Fusao das empresas pela controlada CSN Steel S.L.U. em dezembro 2017
[3] Empresa vendida em julho de 2017, para a controlada CSN Mineracao