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Determination of fair value (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
BRL (R$)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
Disclosure of financial assets [line items]      
Investments in associates measured at fair value R$ 1,521,675 R$ 1,546,278  
Increase (decrease) in fair value due to change in discount rate by 100 bps, asset R$ 15,217    
Disclosure of financial liabilities [line items]      
Weighted average discount rate 0.1347    
Reasonably possible increase (decrease) in variable, percent 1.00%    
Increase (decrease) in fair value due to change in discount rate, liability R$ 1,651    
Beginning balance [Member]      
Disclosure of financial assets [line items]      
Investment funds   0 R$ 0
Securities of fair value   371,760 0
Investments in associates measured at fair value   1,546,278 1,450,704
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value   116,777 R$ 571,723
Realized and unrealized gains (losses) [Member]      
Disclosure of financial assets [line items]      
Investment funds 0 0  
Securities of fair value 72,544 108,837  
Investments in associates measured at fair value (75,564) (91,212)  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value 0 (12,424)  
Purchases [Member]      
Disclosure of financial assets [line items]      
Investment funds 0 0  
Securities of fair value 0 197,302  
Investments in associates measured at fair value 51,739 0  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value 112,338 106,053  
Payments [Member]      
Disclosure of financial assets [line items]      
Investment funds 0 0  
Securities of fair value 0 0  
Investments in associates measured at fair value 0 0  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value (119,182) (498,576)  
Disposals      
Disclosure of financial assets [line items]      
Investment funds 0 0  
Securities of fair value 0 0  
Investments in associates measured at fair value (1,111) (33,126)  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value 0 0  
Net transfers [Member]      
Disclosure of financial assets [line items]      
Investment funds 277,131 0  
Securities of fair value 0 65,613  
Investments in associates measured at fair value 0 207,390  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value 0 0  
Others [Member]      
Disclosure of financial assets [line items]      
Investment funds 0 0  
Securities of fair value 0 8  
Investments in associates measured at fair value 333 12,522  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value (2,774) (49,999)  
Ending balance [Member]      
Disclosure of financial assets [line items]      
Investment funds 277,131 0  
Securities of fair value 444,304 371,760  
Investments in associates measured at fair value 1,521,675 1,546,278  
Disclosure of financial liabilities [line items]      
Other financial liabilities at fair value R$ 107,159 R$ 116,777