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INVESTMENTS - Equity securities with readily determinable fair values (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
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Dec. 31, 2020
USD ($)
shares
Equity securities with readily determinable fair values          
Equity securities with readily determinable fair value ¥ 3,903 ¥ 2,908     $ 598
Accor          
Equity securities with readily determinable fair values          
Number of ordinary shares acquired | shares 8,737,987 282,787 10,782,131 2,309,981  
Number of ordinary shares sold | shares 1,003,654 4,904,222      
Gain (loss) realized ¥ (21) ¥ 52      
Number of shares held in investment | shares 16,205,010       16,205,010
Unrealized gain from fair value   351      
Unrealized losses from fair value ¥ 253        
Equity securities with readily determinable fair value ¥ 3,849 2,770      
Accor | Maximum          
Equity securities with readily determinable fair values          
Investment in equity securities (in percentage) 7.00%       7.00%
Other marketable securities          
Equity securities with readily determinable fair values          
Unrealized losses from fair value ¥ 12 35 ¥ 120    
Equity securities with readily determinable fair value ¥ 54 ¥ 138