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27. EMPLOYEE BENEFITS (Details 8)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Plan covering 35% of the average salary | Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18 21
Average life expectancy in years of employees who are 40 (in years) 40 43
Plan covering 35% of the average salary | Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18 23
Average life expectancy in years of employees who are 40 (in years) 40 47
Average salary supplementation plan | Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18.74 20.45
Average life expectancy in years of employees who are 40 (in years) 40.6 42.69
Average salary supplementation plan | Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 22.23 23.02
Average life expectancy in years of employees who are 40 (in years) 45.37 46.29
Milenio Plan | Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 21 21
Average life expectancy in years of employees who are 40 (in years) 43 43
Milenio Plan | Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 23 23
Average life expectancy in years of employees who are 40 (in years) 47 47