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INVESTMENTS - Equity-method investments (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2019
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2016
Equity-method investments            
Investment income (loss)   ¥ (140) $ (21) ¥ (164) ¥ (97)  
Other than Temporary Impairment Losses, Investments   92   10 0  
Covid 19 | Equity-method investments            
Equity-method investments            
Other than Temporary Impairment Losses, Investments   47        
AAPC LUB            
Equity-method investments            
Investment income (loss)   21   47 43  
Proceeds from Dividends Received   0   39 60  
Equity Method Investments   490   469    
Percentage of equity interest acquired           28.00%
Hotel related funds            
Equity-method investments            
Investment income (loss)   (16)   11 (28)  
Equity Method Investments   476   507    
Maximum potential loss, in loss of value of interests in investments   476        
China Hospitality JV            
Equity-method investments            
Investment income (loss)   (12)   (2) ¥ (11)  
Equity Method Investments   103   ¥ 115    
Percentage of equity interest acquired         20.00%  
Zleep            
Equity-method investments            
Investment income (loss)   (23)        
Equity Method Investments   ¥ 88        
Percentage of equity interest acquired 51.00%