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EQUITY - Common and preferred shares outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
EQUITY      
Shares exercise period, excluding public offerings 30 days    
Shares exercise period for public offering 10 days    
Common shares      
EQUITY      
Authorized capital 1,500,000,000    
Reconciliations of common and preferred outstanding shares      
Balance at beginning of the year 571,929,945 571,929,945 571,929,945
Balance at end of period 571,929,945 571,929,945 571,929,945
Preferred shares      
EQUITY      
Authorized capital 3,000,000,000    
Reconciliations of common and preferred outstanding shares      
Balance at beginning of the year 1,129,231,487 1,127,010,827 1,124,233,755
Exercise of stock options 4,585,414 2,220,660 2,777,072
Balance at end of period 1,133,816,901 1,129,231,487 1,127,010,827