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23 Post-employment Benefits (Details 7) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | R$ 11,074,608 |  |
Present value of net actuarial obligations, ending balance | 11,820,185 | R$ 11,074,608 |
Unified Plan [member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 6,638,462 | 5,914,764 | R$ 5,352,894
Cost of services | 578 | 560 | 589
Cost of interest | 405,371 | 477,732 | 533,201
Benefits paid | (456,151) | (435,454) | (414,256)
Actuarial (gain) losses | 172,564 | 680,860 | 442,336
Present value of net actuarial obligations, ending balance | 6,760,824 | 6,638,462 | 5,914,764
Plan III [member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 3,046,536 | 2,145,661 | 1,734,568
Cost of services | 2,018 | 4,098 | 9,604
Cost of interest | 183,866 | 128,075 | 195,991
Benefits paid | (203,342) | (174,427) | (133,281)
Actuarial (gain) losses | 315,645 | 943,129 | 338,779
Present value of net actuarial obligations, ending balance | 3,344,723 | 3,046,536 | 2,145,661
Assistance Plan [member] |  |  |
Actuarial Obligations [Roll Forward] |  |  |
Present value of net actuarial obligations, beginning balance | 1,389,610 | 1,140,605 | 1,035,957
Cost of services | 20,854 | 14,306 | 11,633
Cost of interest | 85,561 | 106,004 | 102,916
Benefits paid | (74) | (30) | (7)
Actuarial (gain) losses | 218,687 | 128,725 | (9,894)
Present value of net actuarial obligations, ending balance | R$ 1,714,638 | R$ 1,389,610 | R$ 1,140,605

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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 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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