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Trade receivables (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Trade Receivables      
Balance at beginning of the year R$ 1,280,088 R$ 1,157,619 R$ 1,042,015
Losses 209,360 182,547 176,776
Recoveries (60,931) (60,078) (61,172)
Balance at the end of the year 1,428,517 1,280,088 1,157,619
Write-offs (636,366) (508,055) (329,512)
(Losses)/reversal with state entities - related parties 2,738 (13,206) 290
(Losses) with the private sector / government entities (209,360) (182,547) (176,776)
Recoveries 60,931 60,078 61,172
Amount recorded expense (Note 29) R$ (782,057) R$ (643,730) R$ (444,826)