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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Share-based compensation and Treasury shares (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
segment
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
shares
Share-based compensation        
Recognized share-based compensation expenses ¥ 109 ¥ 122 ¥ 110  
Number of operating segments | segment 2      
Treasury shares        
Aggregate treasury shares (in shares) | shares 30,974,040 30,967,640   30,974,040
Cash consideration paid for ordinary shares repurchased ¥ 107 ¥ 107   $ 17
Hotel operating costs        
Share-based compensation        
Recognized share-based compensation expenses 39 42 35  
Selling and marketing expenses        
Share-based compensation        
Recognized share-based compensation expenses 4 4 3  
General and administrative expenses        
Share-based compensation        
Recognized share-based compensation expenses ¥ 66 ¥ 76 ¥ 72