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INVESTMENTS - Equity securities without readily determinable fair values (Details)
€ in Millions, ¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
CNY (¥)
INVESTMENTS            
Equity securities without readily determinable fair values:   ¥ 257   ¥ 293    
Investment loss (income)   (321) $ (47) 188   ¥ (284)
Impairment of equity securities with out readily determinable fair value   7   0    
Preferred shares            
INVESTMENTS            
Equity securities without readily determinable fair values:   138        
Cjia/Cjia Group            
INVESTMENTS            
Equity securities without readily determinable fair values:   ¥ 138   ¥ 168    
Commerz Real Institute            
INVESTMENTS            
Consideration for purchase of investments | €         € 12  
OYO            
INVESTMENTS            
Equity interest owned (as a percent)   1.00%   1.00%    
Percentage of equity interest acquired 1.00%          
Equity securities without readily determinable fair values:   ¥ 54   ¥ 54    
Investment loss (income)       ¥ 52