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Provision for judicial liabilities - Roll-forward and changes in the provision for probable losses, net of judicial deposits (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
BRL (R$)
item
Dec. 31, 2024
BRL (R$)
item
Probable losses    
Disclosure of other provisions [line items]    
Balance provision at the beginning for the period R$ 3,105,168,000 R$ 3,112,877,000
Payments (164,996,000) (156,097,000)
Reversal (185,208,000) (129,252,000)
Additions 123,510,000 239,750,000
Monetary adjustment 53,066,000 37,890,000
Provision Balance 2,931,540,000 3,105,168,000
Judicial deposits (113,277,000) (178,418,000)
Balance provision at the end for the period 2,818,263,000 2,926,750,000
Probable losses | Taxes and social security (1)    
Disclosure of other provisions [line items]    
Balance provision at the beginning for the period 407,964,000 468,839,000
Payments (71,660,000) (60,081,000)
Reversal (53,512,000) (9,540,000)
Additions 5,498,000 4,689,000
Monetary adjustment 15,926,000 4,057,000
Provision Balance 304,216,000 407,964,000
Judicial deposits (3,653,000) (66,746,000)
Balance provision at the end for the period 300,563,000 341,218,000
Probable losses | Labor    
Disclosure of other provisions [line items]    
Balance provision at the beginning for the period 353,926,000 349,058,000
Payments (85,489,000) (89,221,000)
Reversal (57,176,000) (89,941,000)
Additions 104,951,000 162,456,000
Monetary adjustment 20,887,000 21,574,000
Provision Balance 337,099,000 353,926,000
Judicial deposits (91,177,000) (91,596,000)
Balance provision at the end for the period 245,922,000 262,330,000
Probable losses | Civil, environment and real estate    
Disclosure of other provisions [line items]    
Balance provision at the beginning for the period 215,553,000 139,435,000
Payments (7,847,000) (6,795,000)
Reversal (54,442,000) (1,951,000)
Additions 13,061,000 72,605,000
Monetary adjustment 16,253,000 12,259,000
Provision Balance 182,578,000 215,553,000
Judicial deposits (18,447,000) (20,076,000)
Balance provision at the end for the period 164,131,000 195,477,000
Probable losses | Classes of contingent liabilities [domain]    
Disclosure of other provisions [line items]    
Balance provision at the beginning for the period 2,127,725,000 2,155,545,000
Payments
Reversal (20,078,000) (27,820,000)
Additions
Monetary adjustment
Provision Balance 2,107,647,000 2,127,725,000
Balance provision at the end for the period R$ 2,107,647,000 R$ 2,127,725,000
Possible losses and remote losses | Taxes and social security (1)    
Disclosure of other provisions [line items]    
Number of Administrative Proceedings and Lawsuits | item 56 58
Possible losses and remote losses | Labor    
Disclosure of other provisions [line items]    
Number of Lawsuits | item 1,172 1,178
Possible losses and remote losses | Civil, environment and real estate    
Disclosure of other provisions [line items]    
Number of Lawsuits | item 71 97
Possible losses and remote losses | Civil, environment and real estate | Fibria    
Disclosure of other provisions [line items]    
Loss Contingency, Estimate of Possible Loss R$ 132,808,000 R$ 197,141
Possible losses and remote losses | Tax contingent liability [member] | Fibria    
Disclosure of other provisions [line items]    
Loss Contingency, Estimate of Possible Loss R$ 1,974,839,000 R$ 2,448,564