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20. Employees benefits (Details 3) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employees Benefits Details 3
Fair value of the plan’s assets, beginning of the year	R$ 1,712,551	R$ 1,586,930
Expected return on the plan assets	183,689	201,779	R$ 205,981
Expected Company’s contributions	48,742	23,046
Expected participants’ contributions	52,675	23,525
Benefits paid	(118,360)	(123,347)
Actuarial gains/(losses) included in other comprehensive income (loss)	52,083	192,458	(136,389)
Effect of the plan migration – early reduction/curtailment	0	(191,840)
Fair value of the plan’s assets, end of the year	1,931,380	1,712,551	R$ 1,586,930
(Deficit)/Surplus	R$ 388,461	R$ 753,170

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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]]

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The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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

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