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5. Risk Management (Details 6) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents R$ 3,029,191 R$ 2,283,047 R$ 1,886,221 R$ 1,639,214
Restricted cash 31,900 18,822    
Trade receivables 2,052,416 1,888,505    
Water National Agency - ANA 49,136 70,487    
Borrowings and financing 13,152,796 12,100,966 R$ 11,964,143  
Services payable 454,022 408,275    
Public-Private Partnership - PPP 6,803,620      
Carrying amount        
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents 3,029,191 2,283,047    
Restricted cash 31,900 18,822    
Trade receivables 2,052,416 1,888,505    
Water National Agency - ANA 49,136 70,487    
Other receivables 180,681 169,715    
Borrowings and financing 13,152,796 12,100,966    
Accounts payables to suppliers and contractors 465,993 344,947    
Services payable 454,022 408,275    
Program contract commitments 373,009 239,500    
Public-Private Partnership - PPP 3,413,124 3,071,416    
Fair value        
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents 3,029,191 2,283,047    
Restricted cash 31,900 18,822    
Trade receivables 2,052,416 1,888,505    
Water National Agency - ANA 49,136 70,487    
Other receivables 180,681 169,715    
Borrowings and financing 13,116,684 11,967,909    
Accounts payables to suppliers and contractors 465,993 344,947    
Services payable 454,022 408,275    
Program contract commitments 373,009 239,500    
Public-Private Partnership - PPP R$ 3,413,124 R$ 3,071,416