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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 12)
R$ in Millions
Dec. 31, 2019
BRL (R$)
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 22,763
Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 20,683
Not Later Than One Month [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,839
Not Later Than One Month [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 53
Later Than One Month and Not Later Than Three Months [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,447
Later Than One Month and Not Later Than Three Months [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,154
Later Than Three Months And Not Later Than One Year [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,572
Later Than Three Months And Not Later Than One Year [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,571
Later Than One Year and Not Later Than Five Years [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,535
Later Than One Year and Not Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 15,350
Later Than Five Years [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,555
Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,555
Deficit Of The Pension Plan [member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 981
Deficit Of The Pension Plan [member] | Not Later Than One Month [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 5
Deficit Of The Pension Plan [member] | Later Than One Month and Not Later Than Three Months [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 11
Deficit Of The Pension Plan [member] | Later Than Three Months And Not Later Than One Year [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 123
Deficit Of The Pension Plan [member] | Later Than One Year and Not Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 212
Deficit Of The Pension Plan [member] | Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 630
Debt Agreed With Pension Plan [member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 704
Debt Agreed With Pension Plan [member] | Not Later Than One Month [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 12
Debt Agreed With Pension Plan [member] | Later Than One Month and Not Later Than Three Months [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 24
Debt Agreed With Pension Plan [member] | Later Than Three Months And Not Later Than One Year [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 111
Debt Agreed With Pension Plan [member] | Later Than One Year and Not Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 557
Debt Agreed With Pension Plan [member] | Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk
Onerous Concessions [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 24
Onerous Concessions [Member] | Later Than Three Months And Not Later Than One Year [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2
Onerous Concessions [Member] | Later Than One Year and Not Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 9
Onerous Concessions [Member] | Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 13
Suppliers [Member] | Fixed Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,080
Suppliers [Member] | Not Later Than One Month [Member] | Fixed Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,786
Suppliers [Member] | Later Than One Month and Not Later Than Three Months [Member] | Fixed Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 293
Suppliers [Member] | Later Than Three Months And Not Later Than One Year [Member] | Fixed Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1
Loans, Financings and Debentures [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 18,974
Loans, Financings and Debentures [Member] | Not Later Than One Month [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 36
Loans, Financings and Debentures [Member] | Later Than One Month and Not Later Than Three Months [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,119
Loans, Financings and Debentures [Member] | Later Than Three Months And Not Later Than One Year [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,335
Loans, Financings and Debentures [Member] | Later Than One Year and Not Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 14,572
Loans, Financings and Debentures [Member] | Later Than Five Years [Member] | Floating Interest Rate [Member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 1,912