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19. SHAREHOLDERS' EQUITY (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
Number of common shares outstanding 1,387,524,047 1,387,524,047
Percent of total shares 100.00% 100.00%
Common    
Number of common shares outstanding 1,357,133,047 1,357,133,047
Percent of total shares 97.81% 97.81%
Percent of voting capital 100.00% 100.00%
Treasury shares    
Number of common shares outstanding 30,391,000 30,391,000
Percent of total shares 2.19% 2.19%
Vicunha Acos S.A.    
Number of common shares outstanding 682,855,454 682,855,454
Percent of total shares 49.21% 49.21%
Percent of voting capital 50.32% 50.32%
Rio Iaco Participacoes S.A.    
Number of common shares outstanding 58,193,503 58,193,503
Percent of total shares 4.19% 4.19%
Percent of voting capital 4.29% 4.29%
CFL Participacoes S.A.    
Number of common shares outstanding 3,977,536 3,977,536
Percent of total shares 0.29% 0.29%
Percent of voting capital 0.29% 0.29%
Vicunha Textil S.A.    
Number of common shares outstanding 4,927,000 4,927,000
Percent of total shares 0.36% 0.36%
Percent of voting capital 0.36% 0.36%
Caixa Beneficente dos Empregados da CSN - CBS    
Number of common shares outstanding 20,143,031 20,143,031
Percent of total shares 1.45% 1.45%
Percent of voting capital 1.48% 1.48%
BNDES Participacoes S.A. - BNDESPAR    
Number of common shares outstanding 8,794,890 8,794,890
Percent of total shares 0.63% 0.63%
Percent of voting capital 0.65% 0.65%
NYSE (ADRs)    
Number of common shares outstanding 303,590,364 323,546,664
Percent of total shares 21.88% 23.32%
Percent of voting capital 22.37% 23.84%
BM&FBovespa    
Number of common shares outstanding 274,651,269 254,694,969
Percent of total shares 19.79% 18.36%
Percent of voting capital 20.24% 18.77%