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DEBT - ADS Lending Arrangement (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
May 31, 2018
shares
Dec. 31, 2017
USD ($)
$ / shares
Debt Instrument [Line Items]            
ADS to ordinary share ratio         1  
ADS Lending Arrangement            
Debt Instrument [Line Items]            
Number of Loaned ADS lent 2,606,278          
ADS par value per share | $ / shares           $ 0.0004
ADS to ordinary share ratio         4  
Loand ADS outstanding   10,425,112 10,425,112 10,425,112    
Debt issuance costs ¥ 26         $ 4