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30. EMPLOYEE BENEFITS (Details 15) - Post-employment Healthcare Benefits [member]
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Male [member]      
Disclosure of defined benefit plans [line items]      
Average life expectancy of employees (in years) 20.24 20.24 19.55
Average life expectancy in years of employees who are 40 (in years) 42.74 42.74 41.59
Female [member]      
Disclosure of defined benefit plans [line items]      
Average life expectancy of employees (in years) 20.24 20.24 22.17
Average life expectancy in years of employees who are 40 (in years) 42.74 42.74 45.30