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24. Post-Employment Benefits (Details 10)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Increase by 1%  
Sensitivity of long-term interest rate  
Impacts on the obligations of the pension R$ (382,458)
Impacts on the obligations of healthcare program (182,573)
Sensitivity of growth rate of the medical costs  
Impacts on the obligations of healthcare program 79,801
Impact on cost of service for the following financial year of healthcare program 82
Sensitivity of the service cost  
Impacts on the obligations of the pension (64)
Impacts on the obligations of healthcare program (2,260)
Decrease in 1%  
Sensitivity of long-term interest rate  
Impacts on the obligations of the pension 587,106
Impacts on the obligations of healthcare program 182,573
Sensitivity of growth rate of the medical costs  
Impacts on the obligations of healthcare program (74,557)
Impact on cost of service for the following financial year of healthcare program (918)
Sensitivity of the service cost  
Impacts on the obligations of the pension 98
Impacts on the obligations of healthcare program R$ 2,260