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23 Post-employment benefits (Details 6) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | R$ 11,074,608 | R$ 9,201,030 |  |
Fair value of the plan assets | (10,880,721) | (8,642,068) |  |
Plan coverage status | 193,887 | 558,962 |  |
Unrecognized asset | 999,512 | 408,652 |  |
Total | 1,193,399 | 967,614 |  |
Unified Plan [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 6,638,462 | 5,914,764 | R$ 5,352,894 | R$ 4,951,078
Fair value of the plan assets | (7,546,756) | (6,290,841) | (5,834,572) |
Plan coverage status | (908,294) |  |  |
Unrecognized asset | 908,294 |  |  |
Total |  |  |  |
Plan III [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 3,046,536 | 2,145,661 | 1,734,568 | 1,565,121
Fair value of the plan assets | (3,137,754) | (2,178,236) | (1,821,055) |
Plan coverage status | (91,218) |  |  |
Unrecognized asset | 91,218 |  |  |
Total |  |  |  |
Assistance Plan [Member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 1,389,610 | 1,140,605 | 1,035,957 | R$ 933,914
Fair value of the plan assets | (196,211) | R$ (172,991) | R$ (170,923) |
Plan coverage status | 1,193,399 |  |  |
Unrecognized asset |  |  |  |
Total | R$ 1,193,399 |  |  |

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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 deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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