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15 Intangible assets (Details Narrative)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Municipalities
Dec. 31, 2019
BRL (R$)
Municipalities
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Summary of intangible assets [Line Items]        
Intangible assets R$ 34,405,575 R$ 32,325,447 R$ 29,012,460 R$ 33,466,132
Contract asset 7,969,164 [1] 7,617,714 7,407,948 R$ 10,387,715
Program contracts commitments, current 162,541 273,932    
Program contracts commitments, noncurrent 68,939 103,321    
Capitalized interest and inflation adjustment R$ 238,330 R$ 233,251 488,502  
Percentage of revenue 44.58% 44.48%    
Construction margin R$ (86,477) R$ (65,172) (63,013)  
Discount rate on intangible asset 8.20% 8.20%    
Expropriations R$ 33,136 R$ 34,681 R$ 106,429  
Intangible assets related to PPP ALTO TIETE 287,645 348,586    
Intangible assets related to PPP Sao Lourenco R$ 3,065,445 R$ 3,235,008    
Intangible assets, discount rate for adjustment - PPP 7.80%      
Amortization average rate 4.70% 4.20%    
Right of use operating expense R$ 3,157      
Right of use selling expense 8,736      
Right of use administrative expense 1,950      
Performance Agreements [member]        
Summary of intangible assets [Line Items]        
Intangible assets 265,940 R$ 127,410    
Contract asset R$ 306,738 R$ 51,650    
Sao paulo [member]        
Summary of intangible assets [Line Items]        
Number of municipalities | Municipalities 375 372    
Percentage of revenue 7.50%      
Sao paulo [member] | Services agreement [member]        
Summary of intangible assets [Line Items]        
Percentage of revenue 13.00%      
Alto Tiete Production System [member]        
Summary of intangible assets [Line Items]        
Monthly assigned funds from tariffs R$ 12,064      
Sao Lourenco Production System [member]        
Summary of intangible assets [Line Items]        
Monthly assigned funds from tariffs R$ 34,380      
[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.