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18. Employee Benefits and Private Pension Plan (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Employee Benefits And Private Pension Plan Details 1    
Provision for post-employment benefits, opening R$ 144,751 R$ 126,595
Current service cost 7,664 3,636
Interest cost 15,754 14,538
Actuarial (gains) losses from changes in actuarial assumptions 36,120 11,818
Benefits paid directly by Company and its subsidiaries (11,368) (10,971)
Opening balance CBL S.A. (see Note 3.c) 44,478 0
Exchange rate from foreign subsidiaries 124 (865)
Provision for post-employment benefits, ending R$ 237,523 R$ 144,751