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23 Post-employment benefits (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | R$ 238,326 | R$ 243,750 | R$ 237,597
Management [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 1,560 | 1,725 | 1,690
Pension Plans [Member] | Management [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 1,450 | 1,598 | 1,500
Healthcare Plan [Member] | Management [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 110 | 127 | 190
Employees [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 236,766 | 242,025 | 235,907
Employees [Member] | Pension Plans [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 72,067 | 78,209 | 78,680
Employees [Member] | Healthcare Plan - Post Employment [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 99,578 | 97,866 | 97,511
Employees [Member] | Healthcare Plan - Active Employees [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | 87,515 | 86,580 | 81,617
Employees [Member] | Transfers To Construction In Progress [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits | R$ (22,394) | R$ (20,630) | R$ (21,901)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_5&doctype=Standard -URIDate 2019-03-27 + Details
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