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35 Financial Instruments (Details 10) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Less: Cash and cash equivalents R$ (3,222,768) R$ (2,941,727)
Net income 3,909,750  
Deferred IRPJ and CSLL 24,896  
Provision for IRPJ and CSLL 1,260,469  
Depreciation and amortization 1,009,912  
Capital Management Risk [member]    
Disclosure of detailed information about financial instruments [line items]    
Loans and financing 3,188,531 3,142,383
Debentures 6,757,481 8,429,710
Less: Cash and cash equivalents (3,222,768) (2,941,727)
Less: Bonds and securities (current) (1,465) (3,112)
Less: Bonds and securities (noncurrent) - debt contract guarantees (175,901) (121,617)
Less: Collaterals and escrow accounts STN (133,521) (98,433)
Adjusted net debt 6,412,357 8,407,204
Net income 3,834,172 2,062,869
Equity in earnings of investees (193,547) (106,757)
Deferred IRPJ and CSLL 24,896 205,771
Provision for IRPJ and CSLL 1,260,469 433,555
Financial expenses (income), net (866,271) (488,486)
Depreciation and amortization 1,009,913 1,093,836
Adjusted ebitda R$ 5,069,632 R$ 4,177,760
Adjusted net debt / Ebitda (in R$ per share) R$ 1.26 R$ 2.01