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Derivatives (Details 4) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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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

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