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Post-employment Benefits (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]    
Post-employment benefits, balance at beginning R$ 1,484,243 R$ 1,070,037
Appropriation of actuarial calculation 134,044 128,652
Appropriation of pension and healthcare contributions 123,667 139,701
Adjustment related to actuarial gains (loss) (363,465) 379,126
Amortizations (219,780) (225,421)
Reclassification   (7,852)
Post-employment benefits, balance at ending R$ 1,158,709 R$ 1,484,243