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ACQUISITIONS - Citigo acquisition and Other acquisitions (Details)
¥ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Apr. 30, 2021
CNY (¥)
Dec. 31, 2023
CNY (¥)
item
Dec. 31, 2022
CNY (¥)
item
Dec. 31, 2021
CNY (¥)
item
Acquisitions          
Number of individual companies acquired | item     0    
CitiGo Hotels          
Acquisitions          
Percentage of ownership interest acquired   100.00%      
Aggregated consideration   ¥ 783      
Cash consideration ¥ 749   ¥ 33    
Other acquisitions          
Acquisitions          
Cash consideration       ¥ 9 ¥ 51
Number of hotels acquired | item       7 3