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14. Contract asset (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning R$ 10,387,715    
Additions 3,188,943 R$ 0 R$ 0
Contract renewal 0    
Transfers of works [1] (6,168,710)    
Contract assets, ending 7,407,948 10,387,715  
Agreements - equity value      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 1,303,552    
Additions 367,199    
Contract renewal (284,856)    
Transfers of works [1] (475,481)    
Contract assets, ending 910,414 1,303,552  
Agreements - economic value      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 233,361    
Additions 111,703    
Contract renewal 0    
Transfers of works [1] (96,676)    
Contract assets, ending 248,388 233,361  
Program contracts      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 1,809,257    
Additions 806,554    
Contract renewal 284,856    
Transfers of works [1] (676,695)    
Contract assets, ending 2,223,972 1,809,257  
Services contracts - São Paulo      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 6,733,732    
Additions 1,788,210    
Contract renewal 0    
Transfers of works [1] (4,867,158)    
Contract assets, ending 3,654,784 6,733,732  
Software license      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 533    
Additions 52,183    
Contract renewal 0    
Transfers of works [1] (52,700)    
Contract assets, ending 16 533  
Inventories      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 298,340    
Additions 63,075    
Contract renewal 0    
Transfers of works [1] 0    
Contract assets, ending 361,415 298,340  
Advance to suppliers      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets, beginning 8,940    
Additions 19    
Contract renewal 0    
Transfers of works [1] 0    
Contract assets, ending R$ 8,959 R$ 8,940  
[1] Work in progress transferred from contract asset to intangible asset.