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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details)
¥ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2023
CNY (¥)
Jun. 30, 2022
CNY (¥)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Fair value        
Total equity securities with readily determinable fair values ¥ 83     ¥ 1,788
Property and equipment 11     218
Intangible assets       170
Long-term investments 2     27
Operating lease right-of-use assets 67     76
Operating lease right-of-use assets 28,865   $ 3,981 28,970
Goodwill 5,327   $ 735 5,195
Long-lived asset impairment loss 78 ¥ 91    
Fair value change of available-for-sale debt securities 27 ¥ 0    
Convertible Debt        
Fair value        
Long-term bank borrowings, current portion 3,601      
Carrying amounts of convertible senior notes 3,601     3,463
Fair value of convertible senior notes 4,096     4,283
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair value        
Total equity securities with readily determinable fair values 83     1,788
Employee benefit plan assets 14     13
Recurring basis | Significant Unobservable Inputs (Level 3)        
Fair value        
Available-for-sale debt securities 323     296
Non-recurring basis        
Fair value        
Property and equipment 24     38
Intangible assets       388
Long-term investments 8     11
Operating lease right-of-use assets 150     336
Non-recurring basis | Significant Unobservable Inputs (Level 3)        
Fair value        
Property and equipment 24     38
Intangible assets       388
Long-term investments 8     11
Operating lease right-of-use assets ¥ 150     ¥ 336