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19. Deferred taxes and contributions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | R$ 933,815 | R$ 1,054,103 | R$ 1,252,416 | R$ 1,183,942
Deferred tax liabilities | (1,195,057) | (1,090,857) | (1,066,071) | (1,055,700)
Deferred tax assets (liabilities), net | (261,242) | (36,754) | 186,345 | R$ 128,242
Provisions |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 337,833 | 482,863 | 524,129 |
Pension obligations - G1 |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 157,044 | 165,503 | 167,922 |
Donations of underlying asset on concession agreements |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 54,131 | 55,112 | 57,317 |
Credit losses |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 197,920 | 199,063 | 266,757 |
Other |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 186,887 | 151,562 | 151,247 |
Temporary difference on concession of intangible asset |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (433,842) | (460,177) | (492,341) |
Capitalization of borrowing costs |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (420,978) | (415,379) | (374,512) |
Profit on supply to governmental entities |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (206,978) | (76,705) | (92,365) |
Actuarial gain/loss - G1 Plan |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets |  |  | 85,044 |
Deferred tax liabilities | (36,430) | (36,538) | 0 |
Construction margin |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (86,164) | (88,947) | (91,790) |
Borrowing costs |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | R$ (10,665) | R$ (13,111) | R$ (15,063) |

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