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Schedule of changes in net liabilities (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Net liabilities at December 31, 2020 | R$ 6,843 | R$ 6,709 | R$ 4,989
Expense recognized in Statement of income | 501 | 491 | 464
Contributions paid | (422) | (367) | (343)
Actuarial gains (losses) | (302) | 10 | 1,599
Past service cost (1) | (415) |  |
Net liabilities at December 31, 2021 | 6,205 | 6,843 | 6,709
Current liabilities | 305 |  |
Non-currentliabilities | 6,538 |  |
Pension Plans And Retirement Supplement Plans [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net liabilities at December 31, 2020 | 2,909 | 2,972 | 2,170
Expense recognized in Statement of income | 200 | 206 | 197
Contributions paid | (236) | (211) | (200)
Actuarial gains (losses) | (203) | (58) | 805
Past service cost (1) |  |  |
Net liabilities at December 31, 2021 | 2,670 | 2,909 | 2,972
Health Plan [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net liabilities at December 31, 2020 | 3,319 | 3,102 | 2,344
Expense recognized in Statement of income | 253 | 236 | 222
Contributions paid | (173) | (143) | (131)
Actuarial gains (losses) | 70 | 124 | 667
Past service cost (1) |  |  |
Net liabilities at December 31, 2021 | 3,469 | 3,319 | 3,102
Dental Plan [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net liabilities at December 31, 2020 | 64 | 61 | 48
Expense recognized in Statement of income | 6 | 5 | 5
Contributions paid | (3) | (3) | (2)
Actuarial gains (losses) | (1) | 1 | 10
Past service cost (1) |  |  |
Net liabilities at December 31, 2021 | 66 | 64 | 61
life insurance [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net liabilities at December 31, 2020 | 551 | 574 | 427
Expense recognized in Statement of income | 42 | 44 | 40
Contributions paid | (10) | (10) | (10)
Actuarial gains (losses) | (168) | (57) | 117
Past service cost (1) | (415) |  |
Net liabilities at December 31, 2021 |  | R$ 551 | R$ 574
Current liabilities | 347 |  |
Non-currentliabilities | R$ 5,858 |  |

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [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 c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2021-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [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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