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21. Employees benefits (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employees Benefits Details 2Abstract |  |  |
Defined benefit obligation, beginning of the year | R$ 2,532,338 | R$ 2,319,841 | R$ 2,465,721
Current service cost |  | 13,905 | 17,582
Interest cost | R$ 224,429 | 213,201 | 260,409
Actuarial (gains)/losses recorded as other comprehensive income |  | 114,188 | (305,511)
Benefits paid |  | (128,797) | (118,360)
Defined benefit obligation, end of the year |  | R$ 2,532,338 | R$ 2,319,841

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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