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Provision for judicial liabilities - Roll-forward and changes in the provision for probable losses, net of judicial deposits (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2024
BRL (R$)
item
Dec. 31, 2024
BRL (R$)
item
Dec. 31, 2023
BRL (R$)
item
Probable losses      
Disclosure of other provisions [line items]      
Balance provision at the beginning for the period R$ 3,112,877,000 R$ 3,112,877,000 R$ 3,440,154,000
Payments   (156,097,000) (41,903,000)
Reversal   (129,252,000) (620,907,000)
Additions   239,750,000 270,681,000
Monetary adjustment   37,890,000 64,852,000
Provision Balance   3,105,168,000 3,112,877,000
Judicial deposits   (178,418,000) (252,468,000)
Balance provision at the end for the period   2,926,750,000 2,860,409,000
Probable losses | Fibria      
Disclosure of other provisions [line items]      
Reversal due to a change in probability, cancellation and/or due to settlement     372,541,000
Probable losses | Taxes and social security (1)      
Disclosure of other provisions [line items]      
Balance provision at the beginning for the period 468,839,000 468,839,000 419,915,000
Payments   (60,081,000) (1,717,000)
Reversal   (9,540,000) (18,035,000)
Additions   4,689,000 37,656,000
Monetary adjustment   4,057,000 31,020,000
Provision Balance   407,964,000 468,839,000
Judicial deposits   (66,746,000) (154,469,000)
Balance provision at the end for the period   341,218,000 314,370,000
Probable losses | Labor      
Disclosure of other provisions [line items]      
Balance provision at the beginning for the period 349,058,000 349,058,000 255,805,000
Payments   (89,221,000) (37,172,000)
Reversal   (89,941,000) (101,375,000)
Additions   162,456,000 211,690,000
Monetary adjustment   21,574,000 20,110,000
Provision Balance   353,926,000 349,058,000
Judicial deposits   (91,596,000) (82,305,000)
Balance provision at the end for the period   262,330,000 266,753,000
Probable losses | Civil, environment and real estate      
Disclosure of other provisions [line items]      
Balance provision at the beginning for the period 139,435,000 139,435,000 118,729,000
Payments   (6,795,000) (3,014,000)
Reversal   (1,951,000) (11,337,000)
Additions   72,605,000 21,335,000
Monetary adjustment   12,259,000 13,722,000
Provision Balance   215,553,000 139,435,000
Judicial deposits   (20,076,000) (15,694,000)
Balance provision at the end for the period   195,477,000 123,741,000
Probable losses | Classes of contingent liabilities [domain]      
Disclosure of other provisions [line items]      
Balance provision at the beginning for the period R$ 2,155,545,000 2,155,545,000 2,645,705,000
Payments  
Reversal   (27,820,000) (490,160,000)
Additions  
Monetary adjustment  
Provision Balance   2,127,725,000 2,155,545,000
Balance provision at the end for the period   R$ 2,127,725,000 R$ 2,155,545,000
Possible losses and remote losses | Taxes and social security (1)      
Disclosure of other provisions [line items]      
Number of Administrative Proceedings and Lawsuits | item 32 58  
Possible losses and remote losses | Labor      
Disclosure of other provisions [line items]      
Number of Lawsuits | item   1,178 1,241
Possible losses and remote losses | Civil, environment and real estate      
Disclosure of other provisions [line items]      
Number of Lawsuits | item   97 76
Possible losses and remote losses | Civil, environment and real estate | Fibria      
Disclosure of other provisions [line items]      
Loss Contingency, Estimate of Possible Loss   R$ 133,281,000 R$ 140,470
Possible losses and remote losses | Tax contingent liability [member] | Fibria      
Disclosure of other provisions [line items]      
Loss Contingency, Estimate of Possible Loss   R$ 1,994,444,000 R$ 2,015,075