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Derivatives (Details 4) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments R$ 73,103 R$ 39,006
Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 59,799 33,341
Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 411 193
Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 12,893 5,472
Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 10,014 3,086
Below Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 63,089 35,920
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 42,500 12,710
Not later than one year [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 40,664 12,168
Not later than one year [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 78 1
Not later than one year [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,758 541
Not later than one year [member] | Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,222 55
Not later than one year [member] | Below Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 41,278 12,655
Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 11,940 13,661
Later than one year and not later than three years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 8,678 11,355
Later than one year and not later than three years [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 141 69
Later than one year and not later than three years [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 3,121 2,237
Later than one year and not later than three years [member] | Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 1,544 1,291
Later than one year and not later than three years [member] | Below Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 10,396 12,370
Later than three years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 18,192 12,528
Later than three years and not later than five years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 10,284 9,745
Later than three years and not later than five years [member] | Government Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 192 123
Later than three years and not later than five years [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 7,716 2,660
Later than three years and not later than five years [member] | Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 7,153 1,706
Later than three years and not later than five years [member] | Below Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 11,039 10,822
Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 471 107
Later than five years [member] | Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 173 73
Later than five years [member] | Private Entities [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 298 34
Later than five years [member] | Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 95 34
Later than five years [member] | Below Investment Grade [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 376 73
Credit Default Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 37,066 20,268
Credit Default Swaps [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 6,463 1,141
Credit Default Swaps [Member] | Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 11,940 6,492
Credit Default Swaps [Member] | Later than three years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 18,192 12,528
Credit Default Swaps [Member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 471 107
Total Returns Swap [Member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments 36,037 18,738
Total Returns Swap [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments R$ 36,037 11,569
Total Returns Swap [Member] | Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Maximum potential amount of future payments   R$ 7,169