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Risk and Capital Management (Details 19)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]    
Account balance R$ 21,748 R$ 20,924
N T N C Government Securities [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 5,966 R$ 5,154
DV01 (0.0319) (0.0305)
N T N B Government Securities [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 6,832 R$ 6,094
DV01 (0.0701) (0.0624)
N T N F Government Securities [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 257 R$ 205
DV01 (0.0014) (0.0011)
L T N Government Securities [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 277 R$ 166
DV01 (0.0005) (0.0001)
Indexed To I G P M [Member]    
IfrsStatementLineItems [Line Items]    
Account balance   R$ 7
DV01   (0.0002)
Indexed To I P C A [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 404 R$ 355
DV01 (0.0039) (0.0036)
Indexed To P R E [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 30 R$ 23
Indexed To P Y G [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 76 R$ 30
DV01 (0.0001) (0.0001)
Shares Held For Trading [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 630 R$ 947
DV01 0.06 0.09
Postfixed Assets [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 3,776 R$ 6,048
Under Agreements To Resell [Member]    
IfrsStatementLineItems [Line Items]    
Account balance R$ 3,500 R$ 1,895