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35. Financial Instruments (Details 6) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments Details 7Abstract        
Loans and financing R$ 4,047,307 R$ 3,759,505    
Debentures 7,518,131 6,070,978 R$ 4,790,809  
Ordinary financing of taxes with the federal tax authorities   0    
Endorsment and securities   0    
Less: Cash and cash equivalents (1,948,409) (1,040,075) (982,073) R$ (1,480,727)
Less: Bonds and securities (current) (124,862) 1,341    
Collaterals and escrow accounts   0    
Less: Bonds and securities - held for sale and held for trading (noncurrent) 119,574 112,604    
Less: Collaterals and escrow accounts STN 89,555 75,665    
Adjusted net debt 9,283,038 8,600,798    
Net income 1,444,004 1,118,255 874,472  
Equity in earnings of investees 135,888 (101,739)    
Deferred IRPJ and CSLL (68,072) (105,257) (69,632)  
Provision for IRPJ and CSLL 580,065 379,943 589,322  
Financial expenses (income), net (438,050) 748,440    
Depreciation and amortization 749,179 731,599 R$ 708,296  
Adjusted ebitda R$ 3,007,338 R$ 2,771,241    
Adjusted net debt / Ebitda R$ 3.09 R$ 3.10