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14. FINANCIAL INSTRUMENTS (Details 13) - 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 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)
Exchange variation 3,336  
Foreign exchange risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Appreciation asset position 501,066    
Appreciation liability position (606,430)    
Fair value market amoount receivable / payable (105,364)    
Other income and expenses (283,149)    
Other comprehensive income (825)    
Exchange variation R$ (16,504)    
Foreign exchange risk [member] | 09/02/2020 (settled) [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Other income and expenses R$ (31,678)    
Exchange variation R$ (136)    
Foreign exchange risk [member] | 10/02/2020 (settled) [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Other income and expenses R$ (132,997)    
Exchange variation R$ (9,051)    
Foreign exchange risk [member] | 11/04/2020 (settled) [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Other income and expenses R$ (85,164)    
Exchange variation R$ (7,301)    
Foreign exchange risk [member] | 12/02/2020 (settled) [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Other income and expenses R$ (33,310)    
Exchange variation R$ 52    
Foreign exchange risk [member] | 2/2/2021 [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Appreciation asset position R$ 486,852    
Appreciation liability position (493,925)    
Fair value market amoount receivable / payable (7,073)    
Other comprehensive income (6,888)    
Exchange variation R$ (185)    
Foreign exchange risk [member] | Between one and five years [member]      
Disclosure of detailed information about financial instruments [line items]      
Notional  Platts     
Appreciation asset position R$ 527,684    
Appreciation liability position (521,504)    
Fair value market amoount receivable / payable 6,180    
Other comprehensive income 6,063    
Exchange variation R$ 117