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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 7) - 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
Net effect of exchange rate fluctuation  
United States of America, Dollars | Probable Scenario [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 8,196  
Net effect of exchange rate fluctuation 1,843  
United States of America, Dollars | Probable Scenario [Member] | Appreciation of Twenty Five Percentage On Brazil Real [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 10,245  
Net effect of exchange rate fluctuation 3,892  
United States of America, Dollars | Probable Scenario [Member] | Appreciation of fifty percentage on brazil real [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 12,294  
Net effect of exchange rate fluctuation 5,941  
United States of America, Dollars | Itaipu Binacional [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 243 268
United States of America, Dollars | Itaipu Binacional [Member] | Probable Scenario [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 313  
United States of America, Dollars | Itaipu Binacional [Member] | Probable Scenario [Member] | Appreciation of Twenty Five Percentage On Brazil Real [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 392  
United States of America, Dollars | Itaipu Binacional [Member] | Probable Scenario [Member] | Appreciation of fifty percentage on brazil real [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 470  
Loans and financings [Member] | United States of America, Dollars    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 6,110 R$ 5,882
Loans and financings [Member] | United States of America, Dollars | Probable Scenario [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 7,883  
Loans and financings [Member] | United States of America, Dollars | Probable Scenario [Member] | Appreciation of Twenty Five Percentage On Brazil Real [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed 9,853  
Loans and financings [Member] | United States of America, Dollars | Probable Scenario [Member] | Appreciation of fifty percentage on brazil real [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Net liabilities exposed R$ 11,824