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19 SHAREHOLDERS' EQUITY (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Number of common shares outstanding 1,387,524,047 1,387,524,047
Percent of total shares 100.00% 100.00%
Outstanding Shares [Member]    
Number of common shares outstanding 1,380,114,547 1,380,114,547
Percent of total shares 99.47% 99.47%
Percent of voting capital 100.00% 100.00%
Treasury Shares [Member]    
Number of common shares outstanding 7,409,500 7,409,500
Percent of total shares 0.53% 0.53%
Other Shareholders [Member]    
Number of common shares outstanding 380,192,687 358,246,471
Percent of total shares 27.40% 25.83%
Percent of voting capital 27.55% 25.95%
Vicunha Acos S.A. [Member]    
Number of common shares outstanding [1] 679,522,254 679,522,254
Percent of total shares [1] 48.97% 48.97%
Percent of voting capital [1] 49.24% 49.24%
Rio Iaco Participacoes S.A. [Member]    
Number of common shares outstanding [1] 58,193,503 58,193,503
Percent of total shares [1] 4.19% 4.19%
Percent of voting capital [1] 4.22% 4.22%
NYSE (ADRs) [Member]    
Number of common shares outstanding 262,206,103 284,152,319
Percent of total shares 18.90% 20.48%
Percent of voting capital 19.00% 20.59%
[1] Controlling group companies.