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26. EMPLOYEE BENEFITS (Details 15) - Post-employment healthcare benefits
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Male    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 19.55 19.55
Average life expectancy in years of employees who are 40 (in years) 41.59 41.59
Female    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 22.17 22.17
Average life expectancy in years of employees who are 40 (in years) 45.30 45.30