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Shareholders equity - Other reserves (Details) - BRL (R$)
R$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disclosure of classes of share capital [line items]        
Equity at beginning of period     R$ 32,415,575 R$ 44,810,300
Exchange rate variations on conversion of financial information of the subsidiaries abroad R$ 7,256 R$ 20,218 (105,804) 22,272
Equity at end of period 43,271,305 40,614,195 43,271,305 40,614,195
Other reserves        
Disclosure of classes of share capital [line items]        
Equity at beginning of period     1,348,796 1,538,296
Equity at end of period R$ 945,642 R$ 1,526,009 R$ 945,642 R$ 1,526,009