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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 3)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
FinancialInstrumentsAndRiskManagementLineItems [Line Items]        
Unrealized gain/loss Carrying amount   R$ 2,360 R$ 922  
Unrealized gain/loss fair value   2,949 1,691  
TOTAL CURRENT   15,456 10,354 [1] R$ 27,796
Non-current asset   R$ 2,426 1,456  
Over the counter [member]        
FinancialInstrumentsAndRiskManagementLineItems [Line Items]        
Assets [2] US$ exchange variation + Rate (9.25% p.y.) US$ exchange variation + Rate (9.25% p.y.)    
Liability [2] Local currency + R$ 150.49% of CDI Local currency + R$ 150.49% of CDI    
Maturity period Interest: Half-yearly Principal: Dec. 2024 Interest: Half-yearly Principal: Dec. 2024    
Trade market Over the counter Over the counter    
Unrealized gain/loss Carrying amount   R$ 1,772 814  
Unrealized gain/loss fair value   R$ 2,110 1,235  
Over the counter [member] | USD        
FinancialInstrumentsAndRiskManagementLineItems [Line Items]        
Notional amount | $ [3] $ 1,000      
Over the counter one [member]        
FinancialInstrumentsAndRiskManagementLineItems [Line Items]        
Assets [2] US$ exchange variation + Rate (9.25% p.y.) US$ exchange variation + Rate (9.25% p.y.)    
Liability [2] Local currency + R$125.52% of CDI Local currency + R$125.52% of CDI    
Maturity period Interest: Half-yearly Principal: Dec. 2024 Interest: Half-yearly Principal: Dec. 2024    
Trade market Over the counter Over the counter    
Unrealized gain/loss Carrying amount   R$ 588 108  
Unrealized gain/loss fair value   R$ 839 R$ 456  
Over the counter one [member] | USD        
FinancialInstrumentsAndRiskManagementLineItems [Line Items]        
Notional amount | $ [3] $ 500      
[1] See note 2.8.
[2] For the US$1 billion Eurobond issued on December 2017 (i) for the principal, a call spread was contracted, with floor at R$ 3.25/US$ and ceiling at R$ 5.00/US$ and (ii) a swap was contracted for the total interest, for a coupon of 9.25% p.a. at an average rate equivalent to 150.49% of the CDI. For the additional US$500 issuance of the same Eurobond issued on July 2018 (1) a call spread was contracted for the principal, with floor at R$ 3.85/US$ and ceiling at R$ 5.00/US$ and (2) a swap was contracted for the interest, resulting in a coupon of 9.25% p.a. with an average rate equivalent to 125.52% of the CDI rate The upper limit for the exchange rate in the hedge instrument contracted by the Company for the principal of the Eurobonds is R$ 5.00/US$. The instrument matures in December 2024. If the USD/BRL exchange rate is still over R$ 5.00 in December 2024, the company will disburse, on that date, the difference between the upper limit of the protection range and the spot dollar on that date. The Company is monitoring the possible risks and impacts associated with the dollar being valued above R$ 5.00, and assessing various strategies for mitigating the foreign exchange risk up to the maturity date of the transaction. The hedge instrument fully protects the payment of six-monthly interest, independently of the USD/BRL exchange rate.
[3] In millions of US$.