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24. Post-Employment Benefits (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 968,763 R$ 866,103 R$ 769,865
Post-employment benefits, current 58,478 53,225  
Post-employment benefits, noncurrent 910,285 812,878  
Pension plans      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,149 1,069  
Healthcare plans      
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 967,614 R$ 865,034