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SHARE-BASED COMPENSATION - Recognized share-based compensation expenses (Details) - CNY (¥)
¥ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Share-based compensation    
Recognized share-based compensation expenses ¥ 170 ¥ 61
Hotel operating costs    
Share-based compensation    
Recognized share-based compensation expenses 15 16
Selling and marketing expenses    
Share-based compensation    
Recognized share-based compensation expenses 3 3
General and administrative expenses    
Share-based compensation    
Recognized share-based compensation expenses ¥ 152 ¥ 42