v3.26.1
Property, plant and equipment - Summary (Details) - BRL (R$)
R$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance R$ 64,296,187 R$ 64,986,040
Additions 1,817,608 4,578,826
Write-offs (71,199) (426,152)
Depreciation (2,354,131) (4,845,176)
Transfers and other 6,515 2,649
Ending balance 63,694,980  
Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 16,720,186 16,775,348
Additions 3,080
Write-offs (50,059) (64,222)
Depreciation
Transfers and other (1,430) 5,980
Ending balance R$ 16,668,697  
Buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Average rate % 3.44%  
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance R$ 9,929,884 9,522,593
Additions 262
Write-offs (3,154) (54,566)
Depreciation (232,237) (434,875)
Transfers and other 136,332 896,470
Ending balance R$ 9,830,825  
Machinery, equipment and facilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Average rate % 7.20%  
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance R$ 34,178,753 34,280,498
Additions 229,652 649,533
Write-offs (15,387) (152,457)
Depreciation (1,998,685) (4,123,031)
Transfers and other 2,214,169 3,524,210
Ending balance 34,608,502  
Work in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,764,799 3,510,535
Additions 1,587,554 3,880,270
Write-offs
Depreciation
Transfers and other (2,476,946) (4,626,006)
Ending balance R$ 1,875,407  
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Average rate % 19.81%  
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance R$ 702,565 897,066
Additions 402 45,681
Write-offs (2,599) (154,907)
Depreciation (123,209) (287,270)
Transfers and other 134,390 201,995
Ending balance 711,549  
Accumulated cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 102,257,419 98,731,202
Ending balance 103,309,478  
Accumulated cost | Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 16,720,186 16,775,348
Ending balance 16,668,697  
Accumulated cost | Buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 14,589,194 13,816,631
Ending balance 14,713,150  
Accumulated cost | Machinery, equipment and facilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 66,353,229 62,822,096
Ending balance 68,163,440  
Accumulated cost | Work in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,764,799 3,510,535
Ending balance 1,875,407  
Accumulated cost | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,830,011 1,806,592
Ending balance 1,888,784  
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (37,961,232) (33,745,162)
Ending balance (39,614,498)  
Accumulated depreciation | Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance
Ending balance  
Accumulated depreciation | Buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (4,659,310) (4,294,038)
Ending balance (4,882,325)  
Accumulated depreciation | Machinery, equipment and facilities    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (32,174,476) (28,541,598)
Ending balance (33,554,938)  
Accumulated depreciation | Work in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance
Ending balance  
Accumulated depreciation | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,127,446) R$ (909,526)
Ending balance R$ (1,177,235)