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23 Post-employment benefits (Details 7) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | R$ 9,201,030 |  |
Present value of net actuarial obligations, ending balance | 11,074,608 | R$ 9,201,030 |
Unified Plan [Member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 5,914,764 | 5,352,894 | R$ 4,951,078
Cost of services | 560 | 589 | 329
Cost of interest | 477,732 | 533,201 | 563,257
Benefits paid | (435,454) | (414,256) | (406,023)
Actuarial (gain) losses | 680,860 | 442,336 | 244,253
Present value of net actuarial obligations, ending balance | 6,638,462 | 5,914,764 | 5,352,894
Plan III [Member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 2,145,661 | 1,734,568 | 1,565,121
Cost of services | 4,098 | 9,604 | 10,502
Cost of interest | 128,075 | 195,991 | 176,878
Benefits paid | (174,427) | (133,281) | (122,841)
Actuarial (gain) losses | 943,129 | 338,779 | 104,908
Present value of net actuarial obligations, ending balance | 3,046,536 | 2,145,661 | 1,734,568
Assistance Plan [Member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 1,140,605 | 1,035,957 | 933,914
Cost of services | 14,306 | 11,633 | 9,225
Cost of interest | 106,004 | 102,916 | 105,987
Benefits paid | (30) | (7) | (7)
Actuarial (gain) losses | 128,725 | (9,894) | (13,162)
Present value of net actuarial obligations, ending balance | R$ 1,389,610 | R$ 1,140,605 | R$ 1,035,957

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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 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + Details
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