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24. Post-Employment Benefits (Details 9) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfNetPeriodicPlanCostsGainsLineItems [Line Items]
Cost of current service	R$ 18,964
Estimated cost of interest	711,795
Expected return on plan assets	(786,455)
Expected employee contributions	(2,262)
Costs (income or loss)	(57,958)	R$ (38,360)	R$ (29,679)	R$ (59,584)
Unified Plan
DisclosureOfNetPeriodicPlanCostsGainsLineItems [Line Items]
Cost of current service	560	589	329	203
Estimated cost of interest	477,731	533,201	563,257	601,259
Expected return on plan assets	(584,972)
Expected employee contributions	(213)
Costs (income or loss)	(106,894)
Plan III
DisclosureOfNetPeriodicPlanCostsGainsLineItems [Line Items]
Cost of current service	4,098	9,604	10,502	10,174
Estimated cost of interest	128,060	195,991	176,878	170,531
Expected return on plan assets	(180,750)
Expected employee contributions	(2,049)
Costs (income or loss)	(50,641)
Assistance Plan
DisclosureOfNetPeriodicPlanCostsGainsLineItems [Line Items]
Cost of current service	14,306	11,633	9,225	44,942
Estimated cost of interest	106,004	R$ 102,916	R$ 105,987	R$ 108,465
Expected return on plan assets	(20,733)
Expected employee contributions	0
Costs (income or loss)	R$ 99,577

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- References

No definition available.

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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 2018-01-01
-Paragraph 141
-Subparagraph c
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_iii&doctype=Standard
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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)]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
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-Paragraph 141
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The amount of employee contributions to retirement benefit plans.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph b
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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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-Name IAS
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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

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