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Shareholders equity - Distribution of results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of classes of share capital [line items]    
Result Absorption R$ (7,074,198) R$ 14,084,848
Reserve Balances 13,039,124 35,402,942
Realization of deemed cost, net of taxes    
Disclosure of classes of share capital [line items]    
Result Absorption (79,385) (100,705)
Tax incentives    
Disclosure of classes of share capital [line items]    
Result Absorption 321,671 118,959
Reserve Balances R$ 1,319,908 998,237
Legal Reserve    
Disclosure of classes of share capital [line items]    
Reserve as Percentage of Share Capital 20.00%  
Result Absorption   443,010
Reserve Balances R$ 1,847,109 1,847,109
Capital increase reserve    
Disclosure of classes of share capital [line items]    
Reserve as Percentage of Share Capital 80.00%  
Result Absorption   10,911,226
Reserve Balances R$ 2,807,632 15,670,952
Special statutory reserve    
Disclosure of classes of share capital [line items]    
Reserve as Percentage of Share Capital 20.00%  
Result Absorption   1,212,358
Reserve Balances R$ 1,847,109 1,887,576
Investment reserve    
Disclosure of classes of share capital [line items]    
Result Absorption (7,315,184)  
Reserve Balances 5,157,140 14,972,324
Other capital reserves    
Disclosure of classes of share capital [line items]    
Reserve Balances 60,226 26,744
Unclaimed dividend forfeited    
Disclosure of classes of share capital [line items]    
Result Absorption (1,300)  
Interest on own capital    
Disclosure of classes of share capital [line items]    
Result Absorption R$ 1,500,000