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Financial instruments - Fair value hierarchy (Details) - At fair value - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 40,671,678 R$ 35,999,928
Financial liabilities 10,454,820 2,436,072
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 10,454,820 2,436,072
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 10,454,820 2,436,072
Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,203,776  
Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16,046,835 17,697,740
Financial liabilities 10,454,820 2,436,072
Level 2 | At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 10,454,820 2,436,072
Level 2 | At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 10,454,820 2,436,072
Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 23,421,067 18,302,188
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 17,250,611 17,697,740
At fair value through profit or loss | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,203,776  
At fair value through profit or loss | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16,046,835 17,697,740
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 3,887,100 4,430,454
At fair value through profit or loss | Derivative financial instruments | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 3,887,100 4,430,454
At fair value through profit or loss | Marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 13,363,511 13,267,286
At fair value through profit or loss | Marketable securities | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,203,776  
At fair value through profit or loss | Marketable securities | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 12,159,735 13,267,286
At fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,138,066 23,606
At fair value through other comprehensive income | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,138,066 23,606
At fair value through other comprehensive income | Other investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,138,066 23,606
At fair value through other comprehensive income | Other investments | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,138,066 23,606
Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 22,283,001 18,278,582
Financial assets at amortised cost, category [member] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 22,283,001 18,278,582
Financial assets at amortised cost, category [member] | Biological assets [domain]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 22,283,001 18,278,582
Financial assets at amortised cost, category [member] | Biological assets [domain] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 22,283,001 R$ 18,278,582