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15 Judicial Deposits (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Judicial deposits R$ 486,746 R$ 504,190
Labor Claims [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 72,263 85,187
Taxes Claims [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 346,659 351,402
Civil [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 67,641 60,233
Civil [member] | Customers [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 3,479 1,897
Civil [member] | Easements [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 7,156 5,076
Civil [member] | Civil [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits 57,006 53,260
Others [member]    
Disclosure of fair value measurement of assets [line items]    
Judicial deposits R$ 183 R$ 7,368