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Derivatives (Details 2) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Futures contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount R$ 868,983 R$ 844,005
Futures contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 205,732 257,896
Futures contract [member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 342,884 282,162
Futures contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 113,961 98,490
Futures contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 206,406 205,457
Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 2,844,414 2,396,474
Swap contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 442,179 363,159
Swap contract [member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 391,153 529,896
Swap contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 329,901 232,080
Swap contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 1,681,181 1,271,339
Option contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 2,325,428 1,648,851
Option contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 845,197 1,043,317
Option contract [member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 289,010 201,220
Option contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 1,139,192 371,901
Option contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 52,029 32,413
Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 5,273 6,022
Forward contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 1,535 3,291
Forward contract [member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 758 977
Forward contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 2,963 1,738
Forward contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 17 16
Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 100,812 53,033
Credit Derivatives [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 7,044 3,919
Credit Derivatives [Member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 21,839 827
Credit Derivatives [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 17,740 8,228
Credit Derivatives [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 54,189 40,059
N D F Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 632,408 316,620
N D F Non Deliverable Forward [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 159,559 116,815
N D F Non Deliverable Forward [Member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 235,623 110,717
N D F Non Deliverable Forward [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 113,305 51,623
N D F Non Deliverable Forward [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 123,921 37,465
Other Derivative Financial Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 18,128 8,415
Other Derivative Financial Instruments [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 5,245 218
Other Derivative Financial Instruments [Member] | Later than one month and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 3,139 706
Other Derivative Financial Instruments [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount 782 873
Other Derivative Financial Instruments [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet - notional amount R$ 8,962 R$ 6,618