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Post-employment benefits (Details Narrative) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Plan assets, at fair value R$ 21,490 R$ 23,754  
Medical inflation rate 4.00%    
Inflation rate 4.00%    
Discount rate 9.56% 10.34%  
Other comprehensive income R$ 4,736 R$ 4,004 R$ (5,740)
Plano De Beneficios I I [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities recognized 53    
Other comprehensive income 8    
Other income expenses 2    
Itau Unibanco Holding [Member]      
IfrsStatementLineItems [Line Items]      
Plan assets, at fair value 1 1  
Itau Unibanco Holding [Member] | Real Estate 2 [Member]      
IfrsStatementLineItems [Line Items]      
Plan assets, at fair value R$ 472 R$ 464