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26. EMPLOYEE BENEFITS (Details 16)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]    
General mortality table 35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed) Milenium Plan, 35% and Average Salary Supplementation Plans: AT 2000 segregated by gender (10% smoothed)
Disability mortality table Winklevoss - 1% Winklevoss - 1%
Inflation 5.00% 5.50%
Post-employment healthcare benefits    
Disclosure of defined benefit plans [line items]    
General mortality table AT 2000 segregated by gender AT 2000 segregated by gender
Disability mortality table Winklevoss with death probabilities reduced by 1% in all ages Winklevoss with death probabilities reduced by 1% in all ages
Actuarial nominal discount rate 10.34% 11.73%
Inflation 5.00% 5.50%
Nominal increase in medical cost based on age 0.5% - 3.00%real a.a 0.5% - 3.00%real a.a
Nominal medical costs growth rate 8.41% 8.93%
Average medical cost 1,001.69 698,57