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Provisions - Schedule of Possible Losses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Labour Provision [member]    
IfrsStatementLineItems [Line Items]    
Possible losses R$ 1,363 R$ 1,199
Customer Relations [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 346 231
Other Civil Actions [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 613 537
Civil Cases [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 959 768
Provision for taxes other than income tax [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 2,474 2,149
Regulatory [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 3,145 2,976
Other [member]    
IfrsStatementLineItems [Line Items]    
Possible losses 1,840 1,361
Possiblelosses [Member]    
IfrsStatementLineItems [Line Items]    
Possible losses R$ 9,781 R$ 8,453