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18. Deferred taxes and contributions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning R$ 1,252,416 R$ 1,183,942
Deferred tax liabilities, beginning 138,071 (1,055,700)
Deferred tax assets, net, beginning 186,345 128,242
Deferred tax asset, changes (198,313) 68,474
Deferred tax liabilities, changes (24,786) (10,371)
Deferred tax assets, net, changes (223,099) 58,103
Deferred tax assets, ending 1,054,103 1,252,416
Deferred tax liabilities, ending 130,182 138,071
Deferred tax assets, net, ending (36,754) 186,345
Provisions    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 524,129 480,378
Deferred tax asset, changes (41,266) 43,751
Deferred tax assets, ending 482,863 524,129
Actuarial gain/loss - G1 Plan    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 85,044 0
Deferred tax liabilities, beginning 0 (33,726)
Deferred tax asset, changes (85,044) 85,044
Deferred tax liabilities, changes (36,538) 33,726
Deferred tax assets, ending 0 85,044
Deferred tax liabilities, ending (36,538) 0
Pension obligations - G1    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 167,922 256,808
Deferred tax asset, changes (2,419) (88,886)
Deferred tax assets, ending 165,503 167,922
Donations of underlying asset on concession agreements    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 57,317 53,206
Deferred tax asset, changes (2,205) 4,111
Deferred tax assets, ending 55,112 57,317
Credit losses    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 266,757 213,171
Deferred tax asset, changes (67,694) 53,586
Deferred tax assets, ending 199,063 266,757
Other    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning 151,247 121,550
Deferred tax asset, changes 315 29,697
Deferred tax assets, ending 151,562 151,247
Temporary difference on concession of intangible asset    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax liabilities, beginning (492,341) (524,495)
Deferred tax liabilities, changes 32,164 32,154
Deferred tax liabilities, ending (460,177) (492,341)
Capitalization of borrowing costs    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax liabilities, beginning (374,512) (309,648)
Deferred tax liabilities, changes (40,867) (64,864)
Deferred tax liabilities, ending (415,379) (374,512)
Profit on supply to governmental entities    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax liabilities, beginning (92,365) (81,055)
Deferred tax liabilities, changes 15,660 (11,310)
Deferred tax liabilities, ending (76,705) (92,365)
Construction margin    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax liabilities, beginning (91,790) (94,921)
Deferred tax liabilities, changes 2,843 3,131
Deferred tax liabilities, ending (88,947) (91,790)
Borrowing costs    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax liabilities, beginning (15,063) (11,855)
Deferred tax liabilities, changes 1,952 (3,208)
Deferred tax liabilities, ending (13,111) (15,063)
Tax losses    
SummaryOfDeferredTaxesAndContributionsLineItems [Line Items]    
Deferred tax assets, beginning R$ 0 58,829
Deferred tax asset, changes   (58,829)
Deferred tax assets, ending   R$ 0