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23 Post-employment Benefits (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Post-Employment Benefits [Roll Forward]    
Post-employment benefits, balance at beginning R$ 1,194,936 R$ 968,763
Appropriation of actuarial calculation 94,349 99,578
Appropriation of pension and healthcare contributions 130,129 138,974
Adjustment related to actuarial gains (loss) 271,343 186,628
Amortizations (197,143) (199,007)
Post-employment benefits, balance at ending R$ 1,493,614 R$ 1,194,936