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SHARE-BASED COMPENSATION - Recognized share-based compensation expenses (Details) - CNY (¥)
¥ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Recognized share-based compensation expenses ¥ 61 ¥ 48
Hotel operating costs    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Recognized share-based compensation expenses 16 18
Selling and marketing expenses    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Recognized share-based compensation expenses 3 2
General and administrative expenses    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Recognized share-based compensation expenses ¥ 42 ¥ 28