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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Change in obligation (Details) - Post-employment health care benefit - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EMPLOYEE BENEFITS
Cost of service	R$ 4,144	R$ 4,441	R$ 4,481
Interest expense	11,082	12,162	15,494
Present value of the defined benefit obligations
EMPLOYEE BENEFITS
Obligation at the beginning of the year	316,364	305,447	446,842
Cost of service	4,144	4,441	4,481
Interest expense	11,082	12,162	15,494
Past service cost	(40,740)	5,769	(75,787)
Contributions from participants	1,496	1,556	2,212
Payment of benefits	(18,655)	(14,230)	(14,799)
Gain (loss) on remeasurement	(40,841)	(14,452)	(3,673)
Exchange variations	40,109	15,671	(69,323)
Obligation at the end of the year	R$ 272,959	R$ 316,364	R$ 305,447

X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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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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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: 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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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]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and gains (losses) arising from settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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