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Derivatives (Details 6) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments R$ 34,156 R$ 15,447
Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 28,988 11,882
Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 280 196
Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 4,888 3,369
Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,944 516
Below Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 32,212 14,931
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 18,534 7,291
Not later than one year [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 17,195 6,144
Not later than one year [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 91 33
Not later than one year [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,248 1,114
Not later than one year [member] | Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 218 194
Not later than one year [member] | Below Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 18,316 7,097
Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 6,368 3,566
Later than one year and not later than three years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 4,543 1,792
Later than one year and not later than three years [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 73 102
Later than one year and not later than three years [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,752 1,672
Later than one year and not later than three years [member] | Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 850 253
Later than one year and not later than three years [member] | Below Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 5,518 3,313
Later than three years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 9,176 4,590
Later than three years and not later than five years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 7,172 3,946
Later than three years and not later than five years [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 116 61
Later than three years and not later than five years [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,888 583
Later than three years and not later than five years [member] | Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 876 69
Later than three years and not later than five years [member] | Below Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 8,300 4,521
Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 78  
Later than five years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 78  
Later than five years [member] | Below Investment grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 78  
Credit default swaps [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 18,156 9,837
Credit default swaps [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 2,534 1,681
Credit default swaps [member] | Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 6,368 3,566
Credit default swaps [member] | Later than three years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 9,176 4,590
Credit default swaps [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 78  
Total Returns Swap [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 16,000 5,610
Total Returns Swap [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments R$ 16,000 R$ 5,610