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Taxes (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets R$ 61,668 R$ 59,259
Realization / reversal (17,527) (20,331)
Increase 26,065 22,740
Ending balance, deferred tax assets 70,206 61,668
Beginning balance, deferred tax liabilities 8,537 7,970
Realization / reversal (2,515) (2,631)
Increase 5,928 3,198
Ending balance, deferred tax liabilities 11,950 8,537
Cash flow hedges [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 108 342
Realization / reversal (234)
Increase 284
Ending balance, deferred tax assets 392 108
Reflected In Income [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 58,714 55,806
Realization / reversal (17,283) (19,135)
Increase 23,205 22,043
Ending balance, deferred tax assets 64,636 58,714
Beginning balance, deferred tax liabilities 7,148 7,111
Realization / reversal (2,368) (2,300)
Increase 4,285 2,337
Ending balance, deferred tax liabilities 9,065 7,148
Provision For Expected Loss [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 37,658 34,160
Realization / reversal (6,430) (9,142)
Increase 10,552 12,640
Ending balance, deferred tax assets 41,780 37,658
Related To Income Tax And Social Contribution Tax Carryforwards [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 2,325 2,496
Realization / reversal (385) (547)
Increase 529 376
Ending balance, deferred tax assets 2,469 2,325
Provision For Profit Sharing [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 2,794 2,635
Realization / reversal (2,794) (2,635)
Increase 3,258 2,794
Ending balance, deferred tax assets 3,258 2,794
Provision For Devaluation Of Securities With Permanent Impairment [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 1,006 812
Realization / reversal (1,006) (812)
Increase 1,738 1,006
Ending balance, deferred tax assets 1,738 1,006
Provision [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 5,869 5,734
Realization / reversal (2,354) (2,224)
Increase 2,762 2,359
Ending balance, deferred tax assets 6,277 5,869
Civil Lawsuits [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 1,227 1,230
Realization / reversal (730) (781)
Increase 742 778
Ending balance, deferred tax assets 1,239 1,227
Labor Claims [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 2,867 3,010
Realization / reversal (1,509) (1,328)
Increase 1,816 1,185
Ending balance, deferred tax assets 3,174 2,867
Tax And Social Security [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 1,775 1,494
Realization / reversal (115) (115)
Increase 204 396
Ending balance, deferred tax assets 1,864 1,775
Legal Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 279 464
Realization / reversal (15) (207)
Increase 111 22
Ending balance, deferred tax assets 375 279
Adjustments Of Operations Carried Out On Futures Settlement Market [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 171
Realization / reversal (171)
Increase 787
Ending balance, deferred tax assets 787
Beginning balance, deferred tax liabilities 416 42
Realization / reversal (416) (42)
Increase 416
Ending balance, deferred tax liabilities 416
Adjustment To Fair Value Of Financial Assets At Fair Value Through Profit Or Loss [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 755 804
Realization / reversal (755) (804)
Increase 245 755
Ending balance, deferred tax assets 245 755
Beginning balance, deferred tax liabilities 1,450 1,554
Realization / reversal (1,450) (1,554)
Increase 3,538 1,450
Ending balance, deferred tax liabilities 3,538 1,450
Provision Related To Health Insurance Operations [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 395 400
Realization / reversal (30) (5)
Increase
Ending balance, deferred tax assets 365 395
Other Items Reflected In Income [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 7,633 8,130
Realization / reversal (3,514) (2,588)
Increase 3,223 2,091
Ending balance, deferred tax assets 7,342 7,633
Beginning balance, deferred tax liabilities 2,825 3,184
Realization / reversal (455) (574)
Increase 272 215
Ending balance, deferred tax liabilities 2,642 2,825
Reflected In Stockholder Equity [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 2,954 3,453
Realization / reversal (244) (1,196)
Increase 2,860 697
Ending balance, deferred tax assets 5,570 2,954
Beginning balance, deferred tax liabilities 1,389 859
Realization / reversal (147) (331)
Increase 1,643 861
Ending balance, deferred tax liabilities 2,885 1,389
Adjustment To Fair Value Of Financial Assets At Fair Value Through Other Comprehensive Income [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 2,022 2,546
Realization / reversal (244) (962)
Increase 2,490 438
Ending balance, deferred tax assets 4,268 2,022
Beginning balance, deferred tax liabilities 1,381 854
Realization / reversal (143) (331)
Increase 1,643 858
Ending balance, deferred tax liabilities 2,881 1,381
Other Items Reflected In Income Stockholder Equity [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax assets 824 565
Realization / reversal
Increase 86 259
Ending balance, deferred tax assets 910 824
Depreciation In Excess Finance Lease [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax liabilities 130 141
Realization / reversal (23) (11)
Increase
Ending balance, deferred tax liabilities 107 130
Adjustment Of Escrow Deposits And Provisions [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax liabilities 1,572 1,439
Realization / reversal (9) (92)
Increase 191 225
Ending balance, deferred tax liabilities 1,754 1,572
Post Employment Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax liabilities 15 17
Realization / reversal (15) (17)
Increase 260 15
Ending balance, deferred tax liabilities 260 15
Taxation Of Results Abroad Capital Gains [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax liabilities 740 734
Realization / reversal (10)
Increase 24 16
Ending balance, deferred tax liabilities 764 740
Post Employment Benefits 1 [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance, deferred tax liabilities 8 5
Realization / reversal (4)
Increase 3
Ending balance, deferred tax liabilities R$ 4 R$ 8