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INVESTMENTS - Equity securities without readily determinable fair values (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Sep. 30, 2017
Investment income (loss) ¥ (140) $ (21) ¥ (164) ¥ (97)        
Covid 19                
Impairment of equity securities with out readily determinable fair value ¥ 45              
Cjia Group                
Equity interest owned (as a percent) 15.00%     17.00% 17.00%   23.00%  
Convertible notes term             60 months  
Original value of convertible notes invested             ¥ 52  
Amount invested in convertible note           ¥ 200    
Gain recognized on deemed disposal     9     ¥ 40    
Consideration for purchase of investments | $         $ 45      
Investment income (loss) ¥ (49)   ¥ (45) ¥ (38)        
Equity Method Investments ¥ 0              
OYO                
Equity interest owned (as a percent)               1.00%