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20. Employees benefits (Details Narrative)
R$ in Thousands
 12 Months Ended 36 Months Ended
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Participants
Dec. 31, 2016
BRL (R$)
Participants
Dec. 31, 2015
BRL (R$)
Dec. 31, 2017
BRL (R$)
SummaryOfEmployeeBenefitsLineItems [Line Items]          
Average gross payroll   7.70% 7.30%    
Net actuarial liability   R$ 388,461 R$ 753,170   R$ 388,461
Defined pension plan expense recorded in operating costs   35,156 60,263 R$ 68,412  
Defined pension plan expense recorded in selling expense   1,864 7,982 8,838  
Defined pension plan expense recorded in administrative expense   619 24,557 22,902  
Defined pension plan expense capitalized in assets   R$ 3,988 R$ 4,209 4,504  
Number of active participants | Participants   4,317 4,547    
Number of inactive participants | Participants   6,978 6,896    
Debentures issued   R$ 3,899 R$ 3,937   3,899
Asset's consolidated profitablilty   12.02% 15.99%    
Asset's profitability actuarial target   7.68% 12.44%    
Return of Ibovespa   26.86% 38.94%    
Contribution   R$ 19,220 R$ 10,750    
Contribution - participants   52,675 23,525    
Defined benefit obligation   2,319,841 2,465,721 2,252,204 2,319,841
Defined benefit obligation, operating costs   12,034     12,034
Defined benefit obligation in selling expense   1,744     1,744
Defined benefit obligation in administrative expense   3,245     3,245
Salaries, payroll charges and social contributions   94,352 83,687   R$ 94,352
Capitalized in assets   R$ 2,197      
Migration process, non-recurring contribution     30,891    
Migration process, previous balance     R$ 7,214    
Sabesprev Mais          
SummaryOfEmployeeBenefitsLineItems [Line Items]          
Active participants of Plan   9,328 9,453    
G0          
SummaryOfEmployeeBenefitsLineItems [Line Items]          
Active participants of Plan   10     13
Beneficiaries, retirees and survivors   2,294     2,200
Benefits payable R$ 186,991        
G1          
SummaryOfEmployeeBenefitsLineItems [Line Items]          
Contribution   R$ 48,742 R$ 24,288    
Contribution - participants   52,047 21,895    
Actuarial deficit   35,931 38,668    
Benefits payable   165,307      
Unfunded plan          
SummaryOfEmployeeBenefitsLineItems [Line Items]          
Net actuarial liability   2,543,877 2,512,080   R$ 2,543,877
Defined benefit obligation   R$ 2,543,877 R$ 2,512,080 R$ 2,166,942 R$ 2,543,877