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5. MARKETABLE SECURITIES (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
WAM 2 years 3 months 4 days  
Fair value through other comprehensive income R$ 42,029 R$ 45,963
Fair value through profit and loss 329,202 413,788
Amortized cost 658,735 725,534
Current 314,158 418,182
Non-current [1] 344,577 307,352
Credit linked notes [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through other comprehensive income 19,285
Stocks [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through other comprehensive income 42,029 26,678
Financial treasury bills [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss 312,515 396,994
Investment Funds - FIDC BRF [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss 15,044 14,891
Investment funds [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss 21,371 20,301
Sovereign Bonds and Others [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Amortized cost [2] R$ 287,504 R$ 265,783
Available For Sale [member] | Credit linked notes [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency USD  
Average interest rate (p.a.) [3]  
Trading Securities [member] | Stocks [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency HKD  
Trading Securities [member] | Financial treasury bills [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
WAM [4] 3 years 4 months 20 days  
Currency R$  
Average interest rate (p.a.) [3] 1.90%  
Trading Securities [member] | Investment Funds - FIDC BRF [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
WAM [4] 2 years 11 months 16 days  
Currency R$  
Trading Securities [member] | Investment funds [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency ARS  
Held To Maturity [member] | Sovereign Bonds and Others [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
WAM [4] 2 years 3 months 29 days  
Currency [2] AOA  
Average interest rate (p.a.) [3] 3.82%  
[1] Maturity until December of 2023.
[2] It's comprised of private securities and sovereign securities of the Angola Government and are presented net of expected credit losses in the amount of R$9,894 (R$1,983 on December 31, 2019).
[3] Weighted average annual rate.
[4] Weighted average maturity in years.