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21. Employees benefits (Details Narrative)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Participants
Dec. 31, 2017
BRL (R$)
Participants
Dec. 31, 2016
BRL (R$)
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Average gross payroll   7.30% 7.70%  
Net actuarial liability   R$ (363,902) R$ (388,461)  
Defined pension plan expense recorded in operating costs   7,530 35,156 R$ 60,263
Defined pension plan expense recorded in selling expense   1,133 1,864 7,982
Defined pension plan expense recorded in administrative expense   704 619 24,557
Defined pension plan expense capitalized in assets   R$ 1,955 R$ 3,988 4,209
Number of active participants | Participants   4,056 4,317  
Number of inactive participants | Participants   7,149 6,978  
Asset's consolidated profitablilty   11.75% 12.02%  
Asset's profitability actuarial target   9.12% 7.68%  
Return of Ibovespa   15.03% 26.86%  
Contribution   R$ 20,762 R$ 19,220  
Contribution - participants   36,336 52,675  
Defined benefit obligation   2,532,338 2,319,841 2,465,721
Defined benefit obligation, operating costs   13,227    
Defined benefit obligation in selling expense   1,820    
Defined benefit obligation in administrative expense   3,599    
Salaries, payroll charges and social contributions   110,464 R$ 94,352  
Capitalized in assets   R$ 2,115    
Migration process, non-recurring contribution       30,891
Migration process, previous balance       7,214
Sabesprev Mais        
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Active participants of Plan   9,586 9,328  
G0        
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Active participants of Plan   10 10  
Beneficiaries, retirees and survivors   2,038 2,294  
Benefits payable R$ 188,328      
G1        
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Contribution   R$ 36,199 R$ 48,742  
Contribution - participants   36,336 52,047  
Actuarial deficit   26,672 16,832  
Benefits payable   177,516    
Unfunded plan        
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Net actuarial liability   (2,606,107) (2,543,877)  
Defined benefit obligation   R$ 2,606,107 R$ 2,543,877 R$ 2,512,080