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23 Post-employment benefits (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-Employment Benefits [Roll Forward]    
Post-employment benefits, balance at beginning R$ 968,763 R$ 866,103
Appropriation of actuarial calculation 99,578 97,900
Appropriation of pension and healthcare contributions 138,974 151,215
Adjustment related to actuarial gains (loss) 186,628 58,354
Amortizations (199,007) (204,809)
Post-employment benefits, balance at ending R$ 1,194,936 R$ 968,763