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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

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_v&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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