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Provisions, contingent assets and contingent liabilities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Opening balance R$ 19,744  
Closing balance 19,209 R$ 19,744
Legal proceedings provision [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 3,203 3,231
(-) Provisions guaranteed by indemnity clause (205) (207)
Subtotal 2,998 3,024
Adjustment / Interest 122 129
Changes in the period reflected in income 1,487 1,340
Increase 2,062 1,913
Reversal (575) (573)
Payment / Transfer (1,569) (1,495)
Subtotal 3,038 2,998
(+) Provisions guaranteed by indemnity clause 169 205
Closing balance 3,207 3,203
Current 1,535 1,499
Non-current 1,672 1,704
Labor Provision [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance 7,821 8,186
(-) Provisions guaranteed by indemnity clause (962) (952)
Subtotal 6,859 7,234
Adjustment / Interest 515 288
Changes in the period reflected in income 3,539 2,373
Increase 3,958 2,729
Reversal (419) (356)
Payment / Transfer (3,371) (3,036)
Subtotal 7,542 6,859
(+) Provisions guaranteed by indemnity clause 671 962
Closing balance 8,213 7,821
Current 3,443 2,922
Non-current 4,770 4,899
Miscellaneous other provisions [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 2,141 1,844
Subtotal 2,141  
Adjustment / Interest   1,844
Changes in the period reflected in income 325 332
Increase 325 363
Reversal   (31)
Payment / Transfer (1,400) (35)
Subtotal 1,066 2,141
Closing balance 1,066 2,141
Current 115 2,141
Non-current 951  
Civil Labor And Other Provisions [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance 13,165 13,261
(-) Provisions guaranteed by indemnity clause (1,167) (1,159)
Subtotal 11,998 12,102
Adjustment / Interest 637 417
Changes in the period reflected in income 5,351 4,045
Increase 6,345 5,005
Reversal (994) (960)
Payment / Transfer (6,340) (4,566)
Subtotal 11,646 11,998
(+) Provisions guaranteed by indemnity clause 840 1,167
Closing balance 12,486 13,165
Current 5,093 6,562
Non-current R$ 7,393 R$ 6,603