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Taxes (Details 6) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]      
Income before IRPJ and CSLL R$ 2,489,724 R$ 942,888 R$ 4,580,425
(-) Equity in income (307,808) (478,577) (366,315)
Income after IRPJ and CSLL 2,181,916 464,311 4,214,110
IRPJ and CSLL (34%) (741,851) (157,866) (1,432,797)
Tax effects on:      
Interest on equity (JSCP) 325,720 329,800 223,380
Dividends 453 250 437
Non deductible expenses (22,701) (25,172) (24,679)
Tax incentives 9,905 11,492 40,011
Unrecognized tax loss and negative basis of CSLL (24,345) (29,870) (29,002)
Difference between tax bases of deemed profit and taxable profit 18,844 35,677 49,638
Effect of non taxable monetary variation (Selic) on undue tax payments 87,207 100,282
Others (7,289) 16,506 (5,512)
Current IRPJ and CSLL (371,104) (368,035) (372,180)
Deferred IRPJ and CSLL  R$ 17,047 R$ 649,134 R$ (806,344)
Effective rate - % 16.20% (60.50%) 28.00%