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18. Deferred taxes and contributions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | R$ 1,054,103 | R$ 1,252,416 | R$ 1,183,942 |
Deferred tax liabilities | 130,182 | 138,071 | (1,055,700) |
Deferred tax assets (liabilities), net | (36,754) | 186,345 | 128,242 | R$ 209,478
Provisions |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 482,863 | 524,129 | 480,378 |
Actuarial gain/loss - G1 Plan |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 0 | 85,044 | 0 |
Deferred tax liabilities | (36,538) | 0 | (33,726) |
Pension obligations - G1 |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 165,503 | 167,922 | 256,808 |
Donations of underlying asset on concession agreements |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 55,112 | 57,317 | 53,206 |
Credit losses |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 199,063 | 266,757 | 213,171 |
Other |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax assets | 151,562 | 151,247 | 121,550 |
Temporary difference on concession of intangible asset |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (460,177) | (492,341) | (524,495) |
Capitalization of borrowing costs |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (415,379) | (374,512) | (309,648) |
Profit on supply to governmental entities |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (76,705) | (92,365) | (81,055) |
Construction margin |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | (88,947) | (91,790) | (94,921) |
Borrowing costs |  |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |  |
Deferred tax liabilities | R$ (13,111) | R$ (15,063) | R$ (11,855) |

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