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26. EMPLOYEE BENEFITS (Details 8)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
BD Plan | Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) [1] 20.45 20.45
Average life expectancy in years of employees who are 40 (in years) [1] 42.69 42.69
BD Plan | Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) [1] 23.02 23.02
Average life expectancy in years of employees who are 40 (in years) [1] 46.29 46.29
Milenio Plan | Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) [1] 19.55 19.55
Average life expectancy in years of employees who are 40 (in years) [1] 41.59 41.59
Milenio Plan | Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) [1] 22.17 22.17
Average life expectancy in years of employees who are 40 (in years) [1] 45.30 45.30
[1] The BD Plan is part of the 35% and Average Salary Supplementation Plan and the Milenio Plan is part of the Mixed Supplementary Benefit Plan.