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Schedule of guarantees of the debtor balance on loans and financings (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Borrowings R$ 11,364 R$ 15,020 R$ 14,777 R$ 14,772
Promissory Notes And Sureties [member]        
IfrsStatementLineItems [Line Items]        
Borrowings 7,177      
Guarantee And Receivables [Member]        
IfrsStatementLineItems [Line Items]        
Borrowings 3,094      
Receivables [member]        
IfrsStatementLineItems [Line Items]        
Borrowings 36      
Shares [member]        
IfrsStatementLineItems [Line Items]        
Borrowings 52      
Unsecured [member]        
IfrsStatementLineItems [Line Items]        
Borrowings R$ 1,005