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15 Judicial Deposits (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Judicial deposits R$ 504,190 R$ 528,290
Civil [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 60,233 68,625
Civil [Member] | Customers [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 1,897 1,861
Civil [Member] | Easements [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 5,076 3,280
Civil [Member] | Civil [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 53,260 63,484
Others [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 7,368 5,334
Taxes Claims [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 351,402 369,423
Labor Claims [Member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits R$ 85,187 R$ 84,908