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Obligations for pension and similar liabilities (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Post Employment Plans [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of plan assets at the beginning of the year R$ 26,158,640 R$ 27,328,362 R$ 27,316,715
Interest Income (Expenses) 2,645,046 2,363,706 2,386,330
Remeasurement Real gain loss on actuarial assets excluding interest expenses net (1,338,149) (1,200,878) (99,752)
Contributions 646,952 2,388,681 212,719
By the Bank 644,411 2,386,461 210,367
By plan participants 2,541 2,220 2,352
Other Similar Obligations, Benefits paid (2,822,774) (4,721,231) (2,487,650)
Fair value of plan assets at the end of the year 25,289,715 26,158,640 27,328,362
Other Similar Obligations [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of plan assets at the beginning of the year 5,008,751 5,570,354 4,945,407
Interest Income (Expenses) 528,476 491,611 471,759
Remeasurement Real gain loss on actuarial assets excluding interest expenses net 37,761 (772,305) 387,599
Contributions 182,652 177,614 173,335
By the Bank 182,652 177,614  
Other Similar Obligations, Benefits paid (503,933) (458,523) (407,746)
Fair value of plan assets at the end of the year R$ 5,253,707 R$ 5,008,751 R$ 5,570,354