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Financial instruments - Fair value hierarchy (Details) - At fair value - BRL (R$)
R$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 38,532,746 R$ 35,999,928
Financial liabilities 5,732,329 2,436,072
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,732,329 2,436,072
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,732,329 2,436,072
Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 18,699,634 17,697,740
Financial liabilities 5,732,329 2,436,072
Level 2 | At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,732,329 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 5,732,329 2,436,072
Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 19,833,112 18,302,188
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 18,699,634 17,697,740
At fair value through profit or loss | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 18,699,634 17,697,740
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 3,884,621 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 3,884,621 4,430,454
At fair value through profit or loss | Marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 14,815,013 13,267,286
At fair value through profit or loss | Marketable securities | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 14,815,013 13,267,286
At fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 31,364 23,606
At fair value through other comprehensive income | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 31,364 23,606
At fair value through other comprehensive income | Other investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 31,364 23,606
At fair value through other comprehensive income | Other investments | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 31,364 23,606
Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 19,801,748 18,278,582
Financial assets at amortised cost, category [member] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 19,801,748 18,278,582
Financial assets at amortised cost, category [member] | Biological assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 19,801,748 18,278,582
Financial assets at amortised cost, category [member] | Biological assets [member] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 19,801,748 R$ 18,278,582