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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | R$ 1,054,103 | R$ 1,252,416 | R$ 1,183,942
Deferred tax liabilities, beginning | (1,090,857) | (1,066,071) | (1,055,700)
Deferred tax assets (liabilities) net, beginning | (36,754) | 186,345 | 128,242
Deferred tax asset, changes | (120,288) | (198,313) | 68,474
Deferred tax liabilities, changes | (104,200) | (24,786) | (10,371)
Deferred tax assets, net, changes | (224,488) | (223,099) | 58,103
Deferred tax assets, ending | 933,815 | 1,054,103 | 1,252,416
Deferred tax liabilities, ending | (1,195,057) | (1,090,857) | (1,066,071)
Deferred tax assets (liabilities) net, ending | (261,242) | (36,754) | 186,345
Provisions |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | 482,863 | 524,129 |
Deferred tax asset, changes | (145,030) | (41,266) |
Deferred tax assets, ending | 337,833 | 482,863 | 524,129
Pension obligations - G1 |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | 165,503 | 167,922 |
Deferred tax asset, changes | (8,459) | (2,419) |
Deferred tax assets, ending | 157,044 | 165,503 | 167,922
Donations of underlying asset on concession agreements |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | 55,112 | 57,317 |
Deferred tax asset, changes | (981) | (2,205) |
Deferred tax assets, ending | 54,131 | 55,112 | 57,317
Credit losses |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | 199,063 | 266,757 |
Deferred tax asset, changes | (1,143) | (67,694) |
Deferred tax assets, ending | 197,920 | 199,063 | 266,757
Other |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning | 151,562 | 151,247 |
Deferred tax asset, changes | 35,325 | 315 |
Deferred tax assets, ending | 186,887 | 151,562 | 151,247
Temporary difference on concession of intangible asset |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax liabilities, beginning | (460,177) | (492,341) |
Deferred tax liabilities, changes | 26,335 | 32,164 |
Deferred tax liabilities, ending | (433,842) | (460,177) | (492,341)
Capitalization of borrowing costs |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax liabilities, beginning | (415,379) | (374,512) |
Deferred tax liabilities, changes | (5,599) | (40,867) |
Deferred tax liabilities, ending | (420,978) | (415,379) | (374,512)
Profit on supply to governmental entities |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax liabilities, beginning | (76,705) | (92,365) |
Deferred tax liabilities, changes | (130,273) | 15,660 |
Deferred tax liabilities, ending | (206,978) | (76,705) | (92,365)
Actuarial gain/loss - G1 Plan |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax assets, beginning |  | 85,044 |
Deferred tax liabilities, beginning | (36,538) | 0 |
Deferred tax asset, changes |  | (85,044) |
Deferred tax liabilities, changes | 108 | (36,538) |
Deferred tax assets, ending |  |  | 85,044
Deferred tax liabilities, ending | (36,430) | (36,538) | 0
Construction margin |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax liabilities, beginning | (88,947) | (91,790) |
Deferred tax liabilities, changes | 2,783 | 2,843 |
Deferred tax liabilities, ending | (86,164) | (88,947) | (91,790)
Borrowing costs |  |  |
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items] |  |  |
Deferred tax liabilities, beginning | (13,111) | (15,063) |
Deferred tax liabilities, changes | 2,446 | 1,952 |
Deferred tax liabilities, ending | R$ (10,665) | R$ (13,111) | R$ (15,063)

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_o&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_56&doctype=Standard -URIDate 2018-03-16 + Details
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