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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 6) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed R$ 6,353 R$ 6,150
United States of America, Dollars    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 6,353 6,150
United States of America, Dollars | Loans and financings [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 6,110 5,882
United States of America, Dollars | Itaipu Binacional [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 243 268
Foreign currency risk [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 1,576 1,588
Foreign currency risk [Member] | Loans and financings [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 1,516 1,518
Foreign currency risk [Member] | Itaipu Binacional [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed R$ 60 R$ 70