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Derivatives (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (85,413) R$ (52,475)
Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 0.50% 0.40%
Financial liabilities at fair value R$ (425) R$ (153)
Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 60.20% 63.80%
Financial liabilities at fair value R$ (51,394) R$ (35,741)
Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 24.10% 20.40%
Financial liabilities at fair value R$ (20,588) R$ (8,972)
Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 1.70% 5.30%
Financial liabilities at fair value R$ (1,450) R$ (2,982)
Derivative Liabilities [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 0.90% 0.50%
Financial liabilities at fair value R$ (795) R$ (149)
Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 12.60% 9.60%
Financial liabilities at fair value R$ (10,761) R$ (4,478)
Not later than one month [member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 12.60% 15.20%
Financial liabilities at fair value R$ (10,775) R$ (7,988)
Not later than one month [member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (203) (2)
Not later than one month [member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (3,187) (3,231)
Not later than one month [member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (3,902) (903)
Not later than one month [member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (1,435) (2,965)
Not later than one month [member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (2,048) R$ (887)
Later than one month and not later than three months [member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 8.40% 4.50%
Financial liabilities at fair value R$ (7,206) R$ (2,336)
Later than one month and not later than three months [member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (9) (4)
Later than one month and not later than three months [member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (1,889) (745)
Later than one month and not later than three months [member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (2,424) (775)
Later than one month and not later than three months [member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value  
Later than one month and not later than three months [member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (2,884) R$ (812)
Later than three months and not later than six months [member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 8.20% 7.30%
Financial liabilities at fair value R$ (6,973) R$ (3,829)
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (5) (4)
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (2,403) (1,245)
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (2,177) (1,542)
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value  
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (153) (1)
Later than three months and not later than six months [member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (2,235) R$ (1,037)
Later than six months and not later than one year [member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 18.30% 14.90%
Financial liabilities at fair value R$ (15,626) R$ (7,798)
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (1) (2)
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (3,665) (2,074)
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (10,224) (4,693)
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (2)  
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (58) (2)
Later than six months and not later than one year [member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (1,676) R$ (1,027)
Later than one year and not later than two years [member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 14.70% 14.40%
Financial liabilities at fair value R$ (12,566) R$ (7,553)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (15) (6)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (10,065) (6,476)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (1,065) (595)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (1)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (6) (32)
Later than one year and not later than two years [member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value R$ (1,415) R$ (443)
Later Than Two Years [Member] | Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 37.80% 43.70%
Financial liabilities at fair value R$ (32,267) R$ (22,971)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (192) (135)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (30,185) (21,970)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (796) (464)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (13) (16)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (578) (114)
Later Than Two Years [Member] | Derivative Liabilities [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value (503) (272)
Derivative Assets [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 92,439 R$ 55,251
% per maturity term 100.00% 100.00%
Derivative Assets [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 1,262 R$ 642
% per maturity term 1.40% 1.20%
Derivative Assets [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 15,232 R$ 10,327
% per maturity term 16.50% 18.70%
Derivative Assets [Member] | Not later than one month [member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 715 R$ 464
Derivative Assets [Member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 6,405 R$ 5,436
% per maturity term 6.90% 9.80%
Derivative Assets [Member] | Later than one month and not later than three months [member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 130 R$ 2
Derivative Assets [Member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 5,916 R$ 2,921
% per maturity term 6.40% 5.30%
Derivative Assets [Member] | Later than three months and not later than six months [member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 5 R$ 7
Derivative Assets [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 13,888 R$ 5,613
% per maturity term 15.00% 10.20%
Derivative Assets [Member] | Later than six months and not later than one year [member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 2 R$ 8
Derivative Assets [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 11,330 R$ 9,500
% per maturity term 12.30% 17.20%
Derivative Assets [Member] | Later than one year and not later than two years [member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 6 R$ 7
Derivative Assets [Member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 39,668 R$ 21,454
% per maturity term 42.90% 38.80%
Derivative Assets [Member] | Later Than Two Years [Member] | Swaps Other Companies [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 404 R$ 154
Derivative Assets [Member] | Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 55,428 R$ 37,957
% per maturity term 59.90% 68.70%
Derivative Assets [Member] | Swap contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 4,511 R$ 4,310
Derivative Assets [Member] | Swap contract [member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1,276 1,063
Derivative Assets [Member] | Swap contract [member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1,653 1,177
Derivative Assets [Member] | Swap contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 2,610 2,915
Derivative Assets [Member] | Swap contract [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 8,237 7,921
Derivative Assets [Member] | Swap contract [member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 37,141 20,571
Derivative Assets [Member] | Option Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 21,170 R$ 7,718
% per maturity term 22.90% 14.00%
Derivative Assets [Member] | Option Agreements [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 6,209 R$ 1,374
Derivative Assets [Member] | Option Agreements [Member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 2,371 3,095
Derivative Assets [Member] | Option Agreements [Member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1,892 675
Derivative Assets [Member] | Option Agreements [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 8,767 1,638
Derivative Assets [Member] | Option Agreements [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1,454 710
Derivative Assets [Member] | Option Agreements [Member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 477 226
Derivative Assets [Member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 1,739 R$ 3,274
% per maturity term 1.90% 5.90%
Derivative Assets [Member] | Forward contract [member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 1,568 R$ 3,129
Derivative Assets [Member] | Forward contract [member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 62 85
Derivative Assets [Member] | Forward contract [member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 87 32
Derivative Assets [Member] | Forward contract [member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 5 9
Derivative Assets [Member] | Forward contract [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value
Derivative Assets [Member] | Forward contract [member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 17 19
Derivative Assets [Member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 633 R$ 282
% per maturity term 0.70% 0.50%
Derivative Assets [Member] | Credit Derivatives [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 2 R$ 2
Derivative Assets [Member] | Credit Derivatives [Member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1  
Derivative Assets [Member] | Credit Derivatives [Member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 25 5
Derivative Assets [Member] | Credit Derivatives [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 26 11
Derivative Assets [Member] | Credit Derivatives [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 19 73
Derivative Assets [Member] | Credit Derivatives [Member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 560 191
Derivative Assets [Member] | Non Deliverable Forward [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 12,207 R$ 5,378
% per maturity term 13.20% 9.70%
Derivative Assets [Member] | Non Deliverable Forward [Member] | Not later than one month [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 2,227 R$ 1,048
Derivative Assets [Member] | Non Deliverable Forward [Member] | Later than one month and not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 2,565 1,191
Derivative Assets [Member] | Non Deliverable Forward [Member] | Later than three months and not later than six months [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 2,254 1,025
Derivative Assets [Member] | Non Deliverable Forward [Member] | Later than six months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 2,478 1,032
Derivative Assets [Member] | Non Deliverable Forward [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value 1,614 789
Derivative Assets [Member] | Non Deliverable Forward [Member] | Later Than Two Years [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value R$ 1,069 R$ 293
Derivative Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
% per maturity term 100.00% 100.00%