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26. EMPLOYEE BENEFITS (Details 5) - BRL (R$) R$ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits Details 5
Actuarial losses and (gains)		R$ 166,540	R$ 393,743	R$ (137,859)
Return on plan assets (less interest income)		(36,627)	(427,523)	147,728
Change in the asset's limit (excluding the interest revenue)		(97,882)	41,796	(4,208)
Total	[1]	32,031	8,016	5,661
Actuarial losses and (gains) recognized in other comprehensive income		32,037	8,023	5,665
Unrecognized actuarial (gains)		(6)	(7)	(4)
Total cost of actuarial losses and (gains)	[1]	R$ 32,031	R$ 8,016	R$ 5,661
[1] Actuarial (gain)/loss results from the fluctuation in the investments comprised in the CBS's asset portfolio.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2017-01-01
-Paragraph 141
-Subparagraph c
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. 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]]

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