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Financial instruments - Fair value hierarchy (Details) - At fair value - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 41,575,990 R$ 40,671,678
Financial liabilities 7,623,291 10,454,820
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,184,341 2,303,646
Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 14,912,594 16,046,835
Financial liabilities 7,623,291 10,454,820
Level 2 | At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
Level 2 | At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 24,479,055 22,321,197
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16,168,188 17,250,611
At fair value through profit or loss | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,255,594 1,203,776
At fair value through profit or loss | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 14,912,594 16,046,835
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 8,116,404 3,887,100
At fair value through profit or loss | Derivative financial instruments | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 8,116,404 3,887,100
At fair value through profit or loss | Marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 8,051,784 13,363,511
At fair value through profit or loss | Marketable securities | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,255,594 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 6,796,190 12,159,735
At fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 962,341 1,138,066
At fair value through other comprehensive income | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 928,747 1,099,870
At fair value through other comprehensive income | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 33,594 38,196
At fair value through other comprehensive income | Other investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 962,341 1,138,066
At fair value through other comprehensive income | Other investments | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 928,747  
At fair value through other comprehensive income | Other investments | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 33,594 38,196
Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 24,445,461 22,283,001
Financial assets at amortised cost, category [member] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 24,445,461 22,283,001
Financial assets at amortised cost, category [member] | Biological assets [domain]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 24,445,461 22,283,001
Financial assets at amortised cost, category [member] | Biological assets [domain] | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 24,445,461 R$ 22,283,001