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19 Deferred taxes and contributions (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | R$ 905,258 | R$ 933,815 | R$ 1,054,103
Deferred income tax liabilities, beginning | (1,339,254) | (1,195,057) | (1,090,857)
Deferred tax assets (liabilities) net, beginning | (433,996) | (261,242) | (36,754)
Deferred tax asset, changes | 26,478 | (28,557) | (120,288)
Deferred tax liabilities, changes | 86,802 | (144,197) | (104,200)
Deferred tax assets, net, changes | 113,280 | (172,754) | (224,488)
Deferred income tax assets, ending | 931,736 | 905,258 | 933,815
Deferred income tax liabilities, ending | (1,252,452) | (1,339,254) | (1,195,057)
Deferred tax assets (liabilities) net, ending | (320,716) | (433,996) | (261,242)
Provisions [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | 366,673 | 337,833 | 482,863
Deferred tax asset, changes | 69,772 | 28,840 | (145,030)
Deferred income tax assets, ending | 436,445 | 366,673 | 337,833
Pension obligations - G1 [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | 157,998 | 157,044 | 165,503
Deferred tax asset, changes | (3,500) | 954 | (8,459)
Deferred income tax assets, ending | 154,498 | 157,998 | 157,044
Donations of underlying asset on concession agreements [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | 51,818 | 54,131 | 55,112
Deferred tax asset, changes | (1,676) | (2,313) | (981)
Deferred income tax assets, ending | 50,142 | 51,818 | 54,131
Credit losses [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | 145,622 | 197,920 | 199,063
Deferred tax asset, changes | 10,097 | (52,298) | (1,143)
Deferred income tax assets, ending | 155,719 | 145,622 | 197,920
Deferred taxes other [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax assets, beginning | 183,147 | 186,887 | 151,562
Deferred tax asset, changes | (48,215) | (3,740) | 35,325
Deferred income tax assets, ending | 134,932 | 183,147 | 186,887
Temporary difference on concession of intangible asset [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (408,732) | (433,842) | (460,177)
Deferred tax liabilities, changes | 20,057 | 25,110 | 26,335
Deferred income tax liabilities, ending | (388,675) | (408,732) | (433,842)
Capitalization of borrowing costs [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (409,236) | (420,978) | (415,379)
Deferred tax liabilities, changes | 19,025 | 11,742 | (5,599)
Deferred income tax liabilities, ending | (390,211) | (409,236) | (420,978)
Profit on supply to governmental entities [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (372,289) | (206,978) | (76,705)
Deferred tax liabilities, changes | 15,776 | (165,311) | (130,273)
Deferred income tax liabilities, ending | (356,513) | (372,289) | (206,978)
Actuarial gain/loss - G1 Plan [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (54,222) | (36,430) | (36,538)
Deferred tax liabilities, changes | 5,243 | (17,792) | 108
Deferred income tax liabilities, ending | (48,979) | (54,222) | (36,430)
Construction margin [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (83,399) | (86,164) | (88,947)
Deferred tax liabilities, changes | 34,556 | 2,765 | 2,783
Deferred income tax liabilities, ending | (48,843) | (83,399) | (86,164)
Borrowing costs [member] |  |  |
Summary of deferred taxes and contributions [Line Items] |  |  |
Deferred income tax liabilities, beginning | (11,376) | (10,665) | (13,111)
Deferred tax liabilities, changes | (7,855) | (711) | 2,446
Deferred income tax liabilities, ending | R$ (19,231) | R$ (11,376) | R$ (10,665)

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