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30. EMPLOYEE BENEFITS (Details 16)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
General mortality table Millennium Plan: AT-2012 segregated by gender Plan 35%: AT-2000 Male aggravated by 15% Supplementation: AT-2000 aggravated by 10% segregated by gender Millennium Plan: AT-2000 smoothed down by 10% segregated by gender Plan 35%: AT-2000 Male aggravated by 15% Supplementation: AT-2000 aggravated by 10% segregated by gender
Inflation rate 3.32% 3.61%
Post-employment Healthcare Benefits [member]    
Disclosure of defined benefit plans [line items]    
General mortality table AT 2000 segregated by gender AT 2000 segregated by gender
Actuarial nominal discount rate 6.53% 6.78%
Inflation rate 3.32% 3.61%
Real increase in medical costs based on age (Aging Factor) 0,5% - 3,00% real per year 0,5% - 3,00% real per year
Nominal increase medical costs growth rate 4.10% 6.98%