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21. Employees benefits (Details 8) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | R$ 1,477,643 | R$ 1,611,138 |
Equities | 249,740 | 199,362 |
Structured investments | 431,828 | 113,363 |
Other | 9,225 | 7,517 |
Fair value of plan's assets | 2,168,436 | 1,931,380 | R$ 1,712,551
NTNBs |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 1,225,738 | 1,064,935 |
NTNCs |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 163,966 | 146,495 |
Government bonds in own portfolio |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 1,389,704 | 1,211,430 |
Fixed income fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 87,939 | 260,352 |
Private credit investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 0 | 135,454 |
Debentures |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 0 | 3,902 |
Stocks investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Equities | 249,740 | 195,459 |
Shares |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Equities | 0 | 3,903 |
Equity investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | 121,043 | 86,193 |
Real estate investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | 0 | 27,170 |
Multimarket investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | R$ 310,875 | R$ 0 |

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