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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 5) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed R$ (8,191) R$ (6,353)
Foreign currency risk [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed (1,577) (1,576)
Foreign currency risk [member] | Loans and financings [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed (1,514) (1,516)
Foreign currency risk [member] | Suppliers (itaipu binacional) [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed (63) (60)
Local Currency [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed (8,191) (6,353)
Local Currency [member] | Loans and financings [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed (7,866) (6,110)
Local Currency [member] | Suppliers (itaipu binacional) [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed R$ (325) R$ (243)