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Schedule of changes in actuarial liabilities (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |
Present value of net actuarial obligations, beginning balance | R$ 11,820,184 |
Present value of net actuarial obligations, ending balance | 10,973,812 | R$ 11,820,184
Unified Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Present value of net actuarial obligations, beginning balance | 6,760,824 | 6,638,462
Cost of services | 252 | 578
Cost of interest | 481,656 | 405,371
Benefits paid | (511,621) | (456,151)
Actuarial (gain) losses | (585,510) | 172,564
Present value of net actuarial obligations, ending balance | 6,145,601 | 6,760,824
Plan I I I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Present value of net actuarial obligations, beginning balance | 3,344,723 | 3,046,536
Cost of services | 2,006 | 2,018
Cost of interest | 246,256 | 183,866
Benefits paid | (233,908) | (203,342)
Actuarial (gain) losses | (21,984) | 315,645
Present value of net actuarial obligations, ending balance | 3,337,093 | 3,344,723
Assistance Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Present value of net actuarial obligations, beginning balance | 1,714,637 | 1,389,610
Cost of services | 7,368 | 20,854
Cost of interest | 125,132 | 85,561
Benefits paid |  | (74)
Actuarial (gain) losses | (356,019) | 218,686
Present value of net actuarial obligations, ending balance | R$ 1,491,118 | R$ 1,714,637

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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 2021-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
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