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14. FINANCIAL INSTRUMENTS (Details 16) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Other operating income and expenses R$ (5,224,682) R$ (4,631,236) R$ 83,332
Other comprehensive income (3,154,442) 105,537 R$ (2,713,844)
Foreign exchange risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Liabilities current (8,722)    
Liabilities non-current (97,535)    
Total (106,257)    
Other operating income and expenses (283,149)    
Other comprehensive income (825)    
Financial income (expenses), net (132,319) 4,986  
Foreign exchange risk [member] | Exchange rate swap dollar x euro [member]      
Disclosure of detailed information about financial instruments [line items]      
Liabilities current (7,829)    
Total (7,829)    
Financial income (expenses), net (9,070) 783  
Foreign exchange risk [member] | Exchange rate swap GBP x euro [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial income (expenses), net (602)  
Foreign exchange risk [member] | Exchange rate swap CDI x dollar [member]      
Disclosure of detailed information about financial instruments [line items]      
Liabilities non-current (97,535)    
Total (97,535)    
Financial income (expenses), net (106,143) 4,203  
Foreign exchange risk [member] | Iron ore derivative [member]      
Disclosure of detailed information about financial instruments [line items]      
Liabilities current (893)    
Total (893)    
Other operating income and expenses (283,149)    
Other comprehensive income (825)    
Financial income (expenses), net R$ (16,504)