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Provisions, contingent assets and contingent liabilities (Details 1) - 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
Provision for taxes other than income tax [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 6,579 6,214
(-) Provisions guaranteed by indemnity clause (79) (75)
Subtotal 6,500 6,139
Adjustment / Interest (1) 543 382
Changes in the period reflected in income (274) 373
Increase 61 722
Reversal (335) (349)
Payment (129) (394)
Subtotal 6,640 6,500
(+) Provisions guaranteed by indemnity clause 83 79
Closing balance 6,723 6,579
Non-current R$ 6,723 R$ 6,579