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15. Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning R$ 33,466,132 R$ 31,246,788 R$ 28,513,626
Transfers to contract assets [1] (10,387,715)    
Additions 1,144,728 3,490,298 3,855,831
Contract renewal 0 0 0
Reversal of estimated losses   13,380 (10,198)
Transfers of works [2] 6,168,710    
Transfers (1,471) (9,374) 12,572
Write-offs and disposals (24,866) (24,412) (14,808)
Amortization (1,353,058) (1,250,548) (1,110,235)
Intangible assets, ending 29,012,460 33,466,132 31,246,788
Agreements - equity value      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 7,141,614 7,482,955 7,287,630
Transfers to contract assets [1] (1,427,046)    
Additions 93 374,775 391,545
Contract renewal (1,935,780) (531,818) (9,587)
Reversal of estimated losses   2,078 (1,335)
Transfers of works [2] 499,002    
Transfers (5,268) 1,663 1,014
Write-offs and disposals (1,406) (2,795) (6,233)
Amortization (197,865) (185,244) (180,079)
Intangible assets, ending 4,073,344 7,141,614 7,482,955
Agreements - economic value      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 1,433,937 1,381,652 1,353,020
Transfers to contract assets [1] (233,361)    
Additions 373 142,429 106,307
Contract renewal 0 0 0
Reversal of estimated losses   8 (8)
Transfers of works [2] 114,442    
Transfers 88 2,604 6
Write-offs and disposals (1,031) (1,163) (110)
Amortization (82,439) (91,593) (77,563)
Intangible assets, ending 1,232,009 1,433,937 1,381,652
Program contracts      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 7,595,066 6,576,021 6,288,575
Transfers to contract assets [1] (2,019,461)    
Additions 928,818 772,278 553,126
Contract renewal 1,935,780 531,818 9,587
Reversal of estimated losses   4,834 (4,360)
Transfers of works [2] 681,742    
Transfers 3,011 (1,784) 2,023
Write-offs and disposals (7,616) (6,606) (5,571)
Amortization (339,411) (281,495) (267,359)
Intangible assets, ending 8,777,929 7,595,066 6,576,021
Program contracts - commitments      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 910,375 823,216 850,530
Transfers to contract assets [1] 0    
Additions 206,946 121,313 5,762
Contract renewal 0 0 0
Reversal of estimated losses   0 0
Transfers of works [2] 0    
Transfers 0 0 0
Write-offs and disposals 0 0 0
Amortization (37,770) (34,154) (33,076)
Intangible assets, ending 1,079,551 910,375 823,216
Services contracts - Sao Paulo      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 15,917,015 14,552,707 12,367,017
Transfers to contract assets [1] (6,707,847)    
Additions 3,724 1,976,079 2,697,724
Contract renewal 0 0 0
Reversal of estimated losses   6,460 (4,495)
Transfers of works [2] 4,818,734    
Transfers 12 (18,346) 9,696
Write-offs and disposals (14,813) (13,848) (2,894)
Amortization (625,373) (586,037) (514,341)
Intangible assets, ending 13,391,452 15,917,015 14,552,707
Software license      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 468,125 430,237 366,854
Transfers to contract assets [1] 0    
Additions 4,774 103,424 101,367
Contract renewal 0 0 0
Reversal of estimated losses   0 0
Transfers of works [2] 54,790    
Transfers 686 6,489 (167)
Write-offs and disposals 0 0 0
Amortization (70,200) (72,025) (37,817)
Intangible assets, ending R$ 458,175 R$ 468,125 R$ 430,237
[1] Work in progress transferred to contract asset due to adoption of IFRS 15, as of January 1, 2018, as described in Note 4.1.
[2] Work in progress transferred from contract asset to intangible asset.