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29. Provisions for Legal Claims and Contingent Liabilities (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of contingent liabilities [line items]    
Contingent liabilities R$ 3,052,690 R$ 3,123,508
Tax    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 568,512 858,082
Labors    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 311,777 360,322
Employee benefits    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 19,099 20,262
Civil    
Disclosure of contingent liabilities [line items]    
Contingent liabilities 1,286,466 1,091,122
Regulatory    
Disclosure of contingent liabilities [line items]    
Contingent liabilities R$ 866,836 R$ 793,720