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21. EQUITY (Details 4) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EquityAbstractLineItems [Line Items]      
Shares at the beginning of the period 811,759,800 811,416,022 811,139,545
Purchase of treasury shares (4,836,000)
Delivery of restricted shares 783,362 343,778 276,477
Shares at the end of the period 807,707,162 811,759,800 811,416,022
Treasury shares [member]      
EquityAbstractLineItems [Line Items]      
Shares at the beginning of the period 713,446 1,057,224 1,333,701
Purchase of treasury shares 4,836,000    
Delivery of restricted shares (783,362) (343,778) (276,477)
Shares at the end of the period 4,766,084 713,446 1,057,224