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INVESTMENTS - Equity securities without readily determinable fair values (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Investment income (loss)   ¥ (60) $ (9) ¥ (140) ¥ (164)    
Investment income recognized   (67) $ (11) (108) 477    
Impairment of equity securities with out readily determinable fair value   ¥ 0   ¥ 45      
Cjia Group              
Equity interest owned (as a percent)   16.00%   15.00%     17.00%
Amount invested in convertible note           ¥ 252  
Gain recognized on deemed disposal         9    
Investment income (loss)   ¥ (15)   ¥ 49 ¥ (45)    
Equity Method Investments   0          
Equity securities without readily determinable fair values:   168   183      
Cjia Group | Preferred Stock              
Equity securities without readily determinable fair values: | $             $ 45
OYO              
Percentage of equity interest acquired 1.00%            
Investment income recognized   ¥ 52          
Equity interest owned (as a percent)   1.00%          
Equity securities without readily determinable fair values:   ¥ 54   ¥ 66