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4. Changes in accounting practices and disclosures (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets        
Cash and cash equivalents R$ 3,029,191 R$ 2,283,047 R$ 1,886,221 R$ 1,639,214
Trade receivables 1,843,333 1,672,595    
Accounts receivable from related parties 174,148 180,773    
Inventories 65,596 85,671    
Restricted cash 31,900 18,822    
Recoverable taxes 380,703 276,585    
Other receivables 77,371 56,592    
Total current assets 5,602,242 4,574,085    
Noncurrent assets        
Trade receivables 209,083 215,910    
Accounts receivable from related parties 669,102 634,387    
Escrow deposits 152,018 122,686    
Water National Agency - ANA 49,136 70,487    
Other receivables 103,310 113,123    
Investments 44,587 36,932 31,096  
Investment properties 47,620 57,652 57,968 56,957
Contract asset 7,407,948 0    
Intangible assets 29,012,460 33,466,132 31,246,788 28,513,626
Property, plant and equipment 267,612 255,050 R$ 302,383 R$ 325,076
Total noncurrent assets 37,962,876 34,972,359    
Total assets R$ 43,565,118 39,546,444    
Previously Reported        
Current assets        
Cash and cash equivalents   2,283,047    
Trade receivables   1,672,595    
Accounts receivable from related parties   180,773    
Inventories   85,671    
Restricted cash   18,822    
Recoverable taxes   276,585    
Other receivables   56,592    
Total current assets   4,574,085    
Noncurrent assets        
Trade receivables   215,910    
Accounts receivable from related parties   634,387    
Escrow deposits   122,686    
Water National Agency - ANA   70,487    
Other receivables   113,123    
Investments   36,932    
Investment properties   57,652    
Contract asset   0    
Intangible assets   33,466,132    
Property, plant and equipment   255,050    
Total noncurrent assets   34,972,359    
Total assets   39,546,444    
Impact of IFRS 15        
Current assets        
Cash and cash equivalents   0    
Trade receivables   0    
Accounts receivable from related parties   0    
Inventories   0    
Restricted cash   0    
Recoverable taxes   0    
Other receivables   0    
Total current assets   0    
Noncurrent assets        
Trade receivables   0    
Accounts receivable from related parties   0    
Escrow deposits   0    
Water National Agency - ANA   0    
Other receivables   0    
Investments   0    
Investment properties   0    
Contract asset   10,387,715    
Intangible assets   (10,387,715)    
Property, plant and equipment   0    
Total noncurrent assets   0    
Total assets   0    
As Adjusted        
Current assets        
Cash and cash equivalents   2,283,047    
Trade receivables   1,672,595    
Accounts receivable from related parties   180,773    
Inventories   85,671    
Restricted cash   18,822    
Recoverable taxes   276,585    
Other receivables   56,592    
Total current assets   4,574,085    
Noncurrent assets        
Trade receivables   215,910    
Accounts receivable from related parties   634,387    
Escrow deposits   122,686    
Water National Agency - ANA   70,487    
Other receivables   113,123    
Investments   36,932    
Investment properties   57,652    
Contract asset   10,387,715    
Intangible assets   23,078,417    
Property, plant and equipment   255,050    
Total noncurrent assets   34,972,359    
Total assets   R$ 39,546,444