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Trade receivables (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Trade Receivables      
Write-offs R$ (685,581) R$ (703,325) R$ (636,366)
(Losses)/reversal with state entities - related parties (1,208) (903) 2,738
(Losses)/reversal with the private sector / government entities (41,793) (21,103) (209,360)
Recoveries 170,793 72,411 60,931
Amount recorded expense (Note 31)   R$ (557,789) R$ (652,920) R$ (782,057)