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30. EMPLOYEE BENEFITS (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Liabilities	R$ 758,426	R$ 912,184
Assets	13,819	13,714
Benefits of Pension Plans [member]
Disclosure of defined benefit plans [line items]
Present value of defined benefit obligation	3,645,822	3,581,460	R$ 3,087,433	R$ 3,077,849
Fair value of plan assets	(3,766,194)	(3,894,488)	(3,403,906)
Deficit(Surplus)	(120,372)	(313,028)	(316,473)
Restriction to actuarial assets due to recovery limitation	186,099	319,102	224,561
Liabilities (Assets), net	65,727	6,074	(91,912)
Liabilities	79,546	19,788	7,982
Assets	(13,819)	(13,714)	(99,894)
Net (assets) recognized in the balance sheet	R$ 65,727	R$ 6,074	R$ (91,912)

X

- Definition

The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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X

- 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
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X

- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

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- Definition

The amount of liabilites held by retirement benefit plans.

+ References

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- Definition

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- Definition

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