XML 141 R127.htm IDEA: XBRL DOCUMENT v3.21.1
19 Deferred taxes and contributions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
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)