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24. Post-Employment Benefits (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Postemployment Benefits Details 2Abstract    
Post-employment benefits, beginning R$ 866,103 R$ 769,865
Appropriation of actuarial calculation 97,900 97,511
Pension and healthcare contributions 151,215 153,069
Adjustment related to actuarial gains (loss) 58,354 46,506
Amortizations (204,809) (200,848)
Post-employment benefits, ending R$ 968,763 R$ 866,103