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Financial instruments - Sensitivity analysis – exposure to interest rates – derivative financial instruments (Details) - Interest rate risk [member]
R$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
BRL (R$)
Dec. 31, 2024
BRL (R$)
Possible 25%    
Disclosure of detailed information about financial instruments [line items]    
Sensitivity Analysis, Interest Rate, Percentage of Increase (Decrease) 25.00% 25.00%
Possible 25% | CDI | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities R$ (943,363) R$ (943,363)
Possible 25% | CDI | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (91,012) (91,012)
Possible 25% | SOFR | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities R$ (136,036) R$ (136,036)
Remote 50%    
Disclosure of detailed information about financial instruments [line items]    
Sensitivity Analysis, Interest Rate, Percentage of Increase (Decrease) 50.00% 50.00%
Remote 50% | CDI | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities R$ (1,868,091) R$ (1,868,091)
Remote 50% | CDI | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (178,459) (178,459)
Remote 50% | SOFR | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (261,559) (261,559)
Probable (base value) | CDI | Derivative options    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (4,328,970) (4,328,970)
Probable (base value) | CDI | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (1,843,087) (1,843,087)
Probable (base value) | SOFR | Derivative swaps    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities R$ (1,843,087) R$ (1,843,087)