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27. EMPLOYEE BENEFITS (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 4Abstract
Cost of current service	R$ 1,169	R$ 1,285
Interest cost	304,132	322,359
Expected return on plan assets	(327,830)	(360,013)
Interest on the asset ceiling effect	16,340	26,843
Total	(6,189)	(9,526)
Total unrecognized costs / (income) (*)	0	6
Total costs / (income) recognized in the income statement	(6,189)	(9,532)
Total costs / (income), net (*)	R$ (6,189)	R$ (9,526)

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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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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), net defined benefit liability (asset)]

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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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