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24. Post-Employment Benefits (Details 6) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfActuarialEvaluationLineItems [Line Items]        
Total liabilities or partially covered R$ 9,201,030 R$ 8,123,419    
Fair value of the plan assets (8,642,068) (7,826,550)    
Plan coverage status 558,962 296,869    
Unrecognized asset 408,652 568,165    
Total 967,614 865,034    
Unified Plan        
DisclosureOfActuarialEvaluationLineItems [Line Items]        
Total liabilities or partially covered 5,914,764 5,352,894 R$ 4,951,078 R$ 4,174,885
Fair value of the plan assets (6,290,841) (5,834,572) (5,478,802) (4,487,550)
Plan coverage status (376,077)      
Unrecognized asset 376,077      
Total 0      
Plan III        
DisclosureOfActuarialEvaluationLineItems [Line Items]        
Total liabilities or partially covered 2,145,661 1,734,568 1,565,121 1,170,528
Fair value of the plan assets (2,178,236) (1,821,055) (1,793,516) (1,162,969)
Plan coverage status (32,575)      
Unrecognized asset 32,575      
Total 0      
Assistance Plan        
DisclosureOfActuarialEvaluationLineItems [Line Items]        
Total liabilities or partially covered 1,140,605 1,035,957 933,914 756,282
Fair value of the plan assets (172,991) R$ (170,923) R$ (165,301) R$ (162,630)
Plan coverage status 967,614      
Unrecognized asset 0      
Total R$ 967,614