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ACQUISITIONS - Citigo acquisition and Other acquisitions (Details)
€ in Millions, ¥ in Millions
12 Months Ended
Apr. 30, 2021
CNY (¥)
Jan. 02, 2020
EUR (€)
item
Jan. 02, 2020
CNY (¥)
item
Dec. 31, 2022
CNY (¥)
item
Dec. 31, 2021
CNY (¥)
item
Dec. 31, 2020
CNY (¥)
item
CitiGo Hotels            
Acquisitions            
Percentage of ownership interest acquired 100.00%          
Aggregated consideration ¥ 783          
Cash consideration         ¥ 749  
Other acquisitions            
Acquisitions            
Cash consideration       ¥ 9 ¥ 51 ¥ 26
Number of hotels acquired | item       7 3 3
Deutsche Hospitality            
Acquisitions            
Percentage of ownership interest acquired   100.00% 100.00%      
Aggregated consideration   € 720 ¥ 5,624      
Number of brands in which entity is operating | item   5 5