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ACQUISITIONS - Citigo acuquisition and Other acquisitions (Details) - CNY (¥)
¥ in Millions
5 Months Ended 9 Months Ended
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
CitiGo Hotels        
Acquisitions        
Percentage of ownership interest acquired 100.00%      
Aggregated consideration ¥ 783      
Cash consideration   ¥ 749    
Other acquisitions        
Acquisitions        
Cash consideration     ¥ 9 ¥ 51