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Retirement plans liabilities (Details 12) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of defined benefit plans [line items]    
Contractual service margin R$ (675,194)  
Insurance liabilities [Member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin (220,806)  
Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 494,630 R$ 331,714
Not later than one year [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 6,544  
Not later than one year [member] | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 50,949 8,223
0-1 year    
Disclosure of defined benefit plans [line items]    
Contractual service margin 7,240  
0-1 year | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 45,984 7,877
Later than two years and not later than three years [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 6,149  
Later than two years and not later than three years [member] | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 41,113 7,615
Later than three years and not later than four years [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 4,939  
Later than three years and not later than four years [member] | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 35,647 7,019
Later than four years and not later than five years [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 5,215  
Later than four years and not later than five years [member] | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 30,324 6,150
Later than five years [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin 87,821  
Later than five years [member] | Insurance liabilities [Member] | Insurance contracts issued [member]    
Disclosure of defined benefit plans [line items]    
Contractual service margin R$ 290,613 R$ 294,830