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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Loyalty Program (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting policies      
Net revenues ¥ 23,891 ¥ 21,882 ¥ 13,862
Minimum      
Accounting policies      
Estimated Membership Duration 2 years    
Maximum      
Accounting policies      
Estimated Membership Duration 5 years    
Loyalty program      
Accounting policies      
Net revenues ¥ 338 ¥ 288 ¥ 267