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Schedule of comparison between book value and fair value of financial instruments (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Financial liabilities R$ (19,754,027) R$ (17,851,998)
Financial liabilities, at fair value (27,142,392) (20,614,154)
[custom:FinancialLiabilitiesAtFairValueOne-0] R$ (20,039,107) (19,252,869)
B R Fbonds B R F S A B R F S B Z 5 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2022  
Financial liabilities R$ (396,802) (367,714)
Financial liabilities, at fair value R$ (409,454) (389,611)
B R Fbonds B R F S A B R F S B Z 4 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2024  
Financial liabilities R$ (1,653,847) (1,538,086)
Financial liabilities, at fair value R$ (1,726,951) (1,659,891)
B R Fbonds B R F S A B R F S B Z 3 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2023  
Financial liabilities R$ (1,303,821) (1,207,468)
Financial liabilities, at fair value R$ (1,337,246) (1,275,598)
B R Fbonds B R F S A B R F S B Z 2 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2022  
Financial liabilities R$ (1,072,454) (1,081,404)
Financial liabilities, at fair value R$ (1,076,964) (1,105,478)
B R Fbonds B R F S A B R F S B Z 478 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2030  
Financial liabilities R$ (3,914,280) (3,951,539)
Financial liabilities, at fair value R$ (3,993,593) (4,333,054)
B R Fbonds B R F S A B R F S B Z 534 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2050  
Financial liabilities R$ (4,423,083) (4,106,115)
Financial liabilities, at fair value R$ (4,521,103) (4,705,851)
Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2026  
Financial liabilities R$ (823,946) (771,138)
Financial liabilities, at fair value R$ (821,444) (778,016)
Debentures One [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2030  
Financial liabilities R$ (2,351,363) (2,250,867)
Financial liabilities, at fair value R$ (2,382,298) (2,225,796)
Debentures Two [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2031  
Financial liabilities R$ (1,034,706)  
Financial liabilities, at fair value R$ (915,353)  
B R F Gmb Hbonds B R F S A B R F S B Z 4 [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings, maturity 2026  
Financial liabilities R$ (2,779,725) (2,577,667)
Financial liabilities, at fair value R$ (2,854,701) R$ (2,779,574)