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27. EMPLOYEE BENEFITS (Details 16)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
General mortality table Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender. 35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed)
Disability mortality table Winklevoss - 1% Winklevoss - 1%
Inflation 4.75% 5.00%
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 9.62% 10.34%
Inflation 4.75% 5.00%
Real increase in medical costs based on age (Aging Factor) 0.5% - 3.00%real a.a 0.5% - 3.00%real a.a
Nominal increase medical costs growth rate 8.15% 8.41%
Average medical cost 1054.65 1,001.69