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14 Contract assets (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Contract Assets R$ 7,969,164 [1] R$ 7,617,714 R$ 7,407,948 R$ 10,387,715
Transfers of works to intangible assets (3,688,414) [2] (3,328,317) (6,168,710)  
Additions 3,984,158 [3] 3,532,283 R$ 3,188,943  
Right of use of leased assets 589,130 640,415    
Leases [IAS17] [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Right of use of leased assets 276,893 R$ 276,893    
Sao Bernardo do Campo [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Contract Assets 496,000      
Additions 228,000      
Sao paulo [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Contract Assets 3,727,000      
Transfers of works to intangible assets 1,414,000      
Additions 1,676,000      
Praia Grande [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Contract Assets 527,000      
Transfers of works to intangible assets 115,000      
Additions 284,000      
Guarulhos [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Transfers of works to intangible assets 173,000      
Cotia [member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Transfers of works to intangible assets R$ 117,000      
[1] The largest works are located in the municipalities of Sao Paulo, Praia Grande and Sao Bernardo do Campo, in the amounts of R$ 3,727 million, R$ 527 million and R$ 496 million, respectively.
[2] The largest transfers of the period are located in the municipalities of Sao Paulo, Guarulhos, Cotia and Praia Grande, in the amounts of R$ 1,414 million, R$ 173 million, R$ 117 million and R$ 115 million, respectively.
[3] The largest additions of the period are located in the municipalities of Sao Paulo, Praia Grande and Sao Bernardo do Campo, in the amounts of R$ 1,676 million, R$ 284 million and R$ 228 million, respectively.