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23. SHAREHOLDERS' EQUITY (Details) - shares
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]    
Number of common shares outstanding 1,387,524,047 1,387,524,047
Percent of total shares 100.00% 100.00%
Outstanding shares [member]    
Disclosure of classes of share capital [line items]    
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]    
Disclosure of classes of share capital [line items]    
Number of common shares outstanding 7,409,500 7,409,500
Percent of total shares 0.53% 0.53%
Vicunha acos s.a [member]    
Disclosure of classes of share capital [line items]    
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 laco participacoes s.a. [member]    
Disclosure of classes of share capital [line items]    
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]    
Disclosure of classes of share capital [line items]    
Number of common shares outstanding 248,763,533 262,206,103
Percent of total shares 17.93% 18.90%
Percent of voting capital 18.02% 19.00%
Other shareholders [member]    
Disclosure of classes of share capital [line items]    
Number of common shares outstanding 393,635,257 380,192,687
Percent of total shares 28.37% 27.40%
Percent of voting capital 28.52% 27.55%
[1] Controlling group companies.