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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Change in plan assets (Details) - Post-employment health care benefit - Plan assets - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EMPLOYEE BENEFITS
Fair value of the plan assets at the beginning of the year	R$ 0	R$ 0
Contributions from sponsors	17,159	12,572	R$ 12,463
Contributions from participants	1,496	1,556	2,212
Payment of benefits	(18,655)	(14,128)	(14,675)
Fair value of plan assets at the end of the year	R$ 0	R$ 0	R$ 0

X

- Definition

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

+ References

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- 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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- 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

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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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