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26. EMPLOYEE BENEFITS (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits Details 4      
Cost of current service R$ 1,285 R$ 1,244 R$ 1,807
Interest cost 322,359 311,361 293,533
Expected return on plan assets (360,013) (345,521) (322,460)
Interest on the asset ceiling effect 26,843 22,189 18,422
Total [1] (9,526) (10,727) (8,698)
Total unrecognized costs (income) [1] 6 7 4
Total (income) recognized in the income statement (9,532) (10,734) (8,702)
Total (income), net [1] R$ (9,526) R$ (10,727) R$ (8,698)
[1] Effect of the limit of IAS 19 Employee Benefits.