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32 Operating Costs and Expenses (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating costs and expenses [line items]      
Personnel and management R$ 1,601,895 R$ 1,325,382 R$ 1,357,785
Provisions for performance and profit sharing [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 481,681 155,544 91,526
Personnel [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 1,098,279 1,143,978 1,238,891
Personnel [member] | Salaries and management fees [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 696,837 746,415 794,966
Personnel [member] | Social charges on payroll [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 227,485 241,025 261,459
Personnel [member] | Meal and education allowance [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 107,052 113,021 113,177
Personnel [member] | Voluntary retirement program [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 66,905 43,517 69,289
Management [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 21,935 25,860 27,368
Management [member] | Salaries and management fees [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 18,465 19,867 21,422
Management [member] | Social charges on payroll [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management 3,233 5,745 5,695
Management [member] | Other expenses [member]      
Disclosure of operating costs and expenses [line items]      
Personnel and management R$ 237 R$ 248 R$ 251