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21. EQUITY (Details) - shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EquityAbstractLineItems [Line Items]      
Outstanding shares 807,707,162 811,759,800 811,416,022
Ordinary shares [member]      
EquityAbstractLineItems [Line Items]      
Outstanding shares 812,473,246 812,473,246 812,473,246
Treasury shares [member]      
EquityAbstractLineItems [Line Items]      
Outstanding shares (4,766,084) (713,446) (1,057,224)