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Other operating income (expenses) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]      
Recovery of expenses R$ 52,600 R$ 128,895 R$ 135,662
Provision reversal 3,434 1,462 1,143
Scrap sales 16,416 16,226 12,763
Provision for civil and tax risks 146,423 (102,539) 33,311
Other employees benefits (18,265) (19,519) (52,521)
Insurance claims costs (18,878) (22,366) (35,102)
Gains (losses) on the disposal and write-off of non-financial assets (1) 63,229 (3,985) 141,211
Demobilization expenses (277) 1,398 (6,814)
Expenses with investigations (1,112) (588,774) (9,003)
Expected credit losses in other receivables (1,481) 102 (579)
Other 8,423 43,830 (8,808)
 Other operating income (expenses), net R$ 250,512 R$ (545,270) R$ 211,263