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11 Related-Party Balances and Transactions (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2015
Disclosure of transactions between related parties [line items]      
Accounts receivable, current R$ 168,054 R$ 192,906 R$ 696,283
Accounts receivable, noncurrent 638,591 657,990  
Total receivables from shareholders 806,645 850,896  
Interest on capital payable to related parties 116,180 401,963  
Reimbursement for benefits GESP 2015 [member]      
Disclosure of transactions between related parties [line items]      
Accounts receivable, current 75,377 68,888  
Accounts receivable, noncurrent 634,288 647,107  
Sanitation services [member]      
Disclosure of transactions between related parties [line items]      
Accounts receivable, current 109,078 131,851  
Total receivables from shareholders 74,254 103,317  
Allowance for losses [member]      
Disclosure of transactions between related parties [line items]      
Accounts receivable, current (39,127) (39,417)  
Reimbursement for retirement and pension benefits paid [member]      
Disclosure of transactions between related parties [line items]      
Accounts receivable, current 22,726 31,584  
Total receivables from shareholders 732,391 747,579  
Agreement for the installment payment of sanitation services [member]      
Disclosure of transactions between related parties [line items]      
Accounts receivable, noncurrent R$ 4,303 R$ 10,883