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26. EMPLOYEE BENEFITS (Details 14) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [line items]      
Actuarial gain (loss) on obligation R$ 166,540 R$ 393,743 R$ (137,859)
Total cost of actuarial losses and (gains) [1] 32,031 8,016 5,661
Post-employment healthcare benefits      
Disclosure of defined benefit plans [line items]      
Actuarial gain (loss) on obligation 170,445 210,257 (97,501)
Total cost of actuarial losses and (gains) R$ 170,445 R$ 210,257 R$ (97,501)
[1] Actuarial (gain)/loss results from the fluctuation in the investments comprised in the CBS's asset portfolio.