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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2024
Fair value    
Property and equipment ¥ 52 ¥ 22
Operating lease right-of-use assets 228 14
Intangible assets 166  
Long-term investments 66  
Goodwill 4  
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair value    
Subtotal 231 219
Employee benefit plan assets 17 17
Recurring basis | Significant Unobservable Inputs (Level 3)    
Fair value    
Available-for-sale debt securities 281 248
Non-recurring basis    
Fair value    
Property and equipment 70 13
Operating lease right-of-use assets 309 10
Intangible assets 236  
Long-term investments 113  
Non-recurring basis | Significant Unobservable Inputs (Level 3)    
Fair value    
Property and equipment 70 13
Operating lease right-of-use assets 309 ¥ 10
Intangible assets 236  
Long-term investments ¥ 113