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Retirement plans liabilities (Details 9) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]      
Assets R$ 396,528,353 R$ 347,456,760  
Securities - Brazilian sovereign bonds (Note 7A) 365,169,005 321,697,974  
Other assets 10,769,686 10,657,119  
Liabilities 372,980,645 327,409,523  
Equity 5,513,199 3,359,259 R$ 4,449,215
Other comprehensive income 343,906 (1,155,581) 549,824
P&L 5,169,293 4,514,840 R$ 3,899,391
Insurance and reinsurance contracts [Member]      
Disclosure of defined benefit plans [line items]      
Assets 328,216 154,229  
Securities - Brazilian sovereign bonds (Note 7A) 321,448 152,058  
Other assets 6,768 2,171  
Liabilities 316,763 119,582  
Insurance liabilities 316,763 119,582  
Equity 11,453 34,647  
Other comprehensive income (8,188) 30,255  
P&L R$ 19,641 R$ 4,392