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SHARE-BASED COMPENSATION - Plan (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2015
Aug. 31, 2010
Sep. 30, 2009
Oct. 31, 2008
Jun. 30, 2007
Feb. 28, 2007
Share options                  
Share based compensation                  
Granted (in shares) 0 0 0            
Incentive Award Plans                  
Share based compensation                  
Vesting period 10 years                
Incentive Award Plans | Maximum                  
Share based compensation                  
Share-based payment award, contractual term 10 years                
Incentive Award Plans | Share options                  
Share based compensation                  
Share-based payment award, option granted (in shares) 245,776,690                
Incentive Award Plans | Restricted stocks                  
Share based compensation                  
Share-based payment award, nonvested restricted stocks (in shares) 243,059,070                
Incentive Award Plans | Second anniversary of the stated vesting commencement date                  
Share based compensation                  
Share-based payment award, vesting percentage 50.00%                
Incentive Award Plans | Vesting ratably over the following two years                  
Share based compensation                  
Share-based payment award, vesting percentage 50.00%                
Vesting period 2 years                
2007 Global Share Plan                  
Share based compensation                  
Share-based payment award, maximum number of incentive award available (in shares)                 100,000,000
2008 Global Share Plan                  
Share based compensation                  
Share-based payment award, maximum number of incentive award available (in shares)             70,000,000 30,000,000  
2009 Global Share Plan                  
Share based compensation                  
Share-based payment award, maximum number of incentive award available (in shares)       430,000,000 150,000,000 30,000,000