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SHARE-BASED COMPENSATION - Recognized share-based compensation expenses (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Recognized share-based compensation expenses ¥ 143 ¥ 87 ¥ 109
Hotel operating costs      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Recognized share-based compensation expenses 31 33 39
Selling and marketing expenses      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Recognized share-based compensation expenses 6 4 4
General and administrative expenses      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Recognized share-based compensation expenses ¥ 106 ¥ 50 ¥ 66