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Schedule of changes in actuarial assets (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Unified Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair value of the plan's assets, beginning balance | R$ 7,568,268 | R$ 7,546,756
Return estimated for assets | 837,120 | 607,252
Contributions and distributions | 26,661 | 23,919
Benefits paid | (511,621) | (456,151)
Actuarial gain (losses) | (1,121,173) | (153,508)
Fair value of the plan's assets, ending balance | 6,799,255 |
Plan I I I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair value of the plan's assets, beginning balance | 3,629,780 | 3,137,754
Return estimated for assets | 133,837 | 224,591
Contributions and distributions | 136,730 | 136,708
Benefits paid | (233,908) | (203,341)
Actuarial gain (losses) | (319,235) | 334,068
Fair value of the plan's assets, ending balance | 3,347,204 |
Assistance Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair value of the plan's assets, beginning balance | 222,148 | 196,211
Return estimated for assets | 6,366 | 16,474
Contributions and distributions |  |
Benefits paid |  |
Actuarial gain (losses) | (31,605) | R$ 9,463
Fair value of the plan's assets, ending balance | R$ 196,909 |

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- Definition The amount of current net defined benefit asset. [Refer: Net defined benefit asset] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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