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19 Deferred taxes and contributions (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets R$ 931,736 R$ 905,258 R$ 933,815 R$ 1,054,103
Total deferred tax liabilities (1,252,452) (1,339,254) (1,195,057) (1,090,857)
Deferred tax assets (liabilities), net (320,716) (433,996) (261,242) (36,754)
Provisions [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets 436,445 366,673 337,833 482,863
Pension obligations - G1 [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets 154,498 157,998 157,044 165,503
Donations of underlying asset on concession agreements [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets 50,142 51,818 54,131 55,112
Credit losses [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets 155,719 145,622 197,920 199,063
Deferred taxes other [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax assets 134,932 183,147 186,887 151,562
Temporary difference on concession of intangible asset [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities (388,675) (408,732) (433,842) (460,177)
Capitalization of borrowing costs [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities (390,211) (409,236) (420,978) (415,379)
Profit on supply to governmental entities [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities (356,513) (372,289) (206,978) (76,705)
Actuarial gain/loss - G1 Plan [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities (48,979) (54,222) (36,430) (36,538)
Construction margin [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities (48,843) (83,399) (86,164) (88,947)
Borrowing costs [member]        
Summary of deferred taxes and contributions [Line Items]        
Total deferred tax liabilities R$ (19,231) R$ (11,376) R$ (10,665) R$ (13,111)