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23 Post-employment Benefits (Details 6) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | R$ 11,820,185 | R$ 11,074,608 |  |
Fair value of the plan assets | (11,420,196) | (10,880,721) |  |
Plan coverage status | 399,989 | 193,887 |  |
Unrecognized asset | 1,092,501 | 999,512 |  |
Total | 1,492,490 | 1,193,399 |  |
Unified Plan [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 6,760,824 | 6,638,462 | R$ 5,914,764 | R$ 5,352,894
Fair value of the plan assets | (7,568,268) | (7,546,756) | (6,290,841) |
Plan coverage status | (807,444) |  |  |
Unrecognized asset | 807,444 |  |  |
Total |  |  |  |
Plan III [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 3,344,723 | 3,046,536 | 2,145,661 | 1,734,568
Fair value of the plan assets | (3,629,780) | (3,137,754) | (2,178,236) |
Plan coverage status | (285,057) |  |  |
Unrecognized asset | 285,057 |  |  |
Total |  |  |  |
Assistance Plan [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total liabilities or partially covered | 1,714,638 | 1,389,610 | 1,140,605 | R$ 1,035,957
Fair value of the plan assets | (222,148) | R$ (196,211) | R$ (172,991) |
Plan coverage status | 1,492,490 |  |  |
Unrecognized asset |  |  |  |
Total | R$ 1,492,490 |  |  |

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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 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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