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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Fair value        
Subtotal ¥ 231   ¥ 1,788  
Impairment charge of intangible assets 166   170  
Goodwill, Impairment Loss 4 $ 1    
Property and equipment, impairment loss 52   218  
Long-term investment, impairment loss 66   27  
Operating lease right-of-use assets, impairment loss 228   76  
Convertible Debt        
Fair value        
Long-term bank borrowings, current portion 3,537      
Carrying amounts of convertible senior notes 3,537   3,463 ¥ 6,186
Fair value of convertible senior notes 3,768   4,283 ¥ 6,681
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair value        
Subtotal 231   1,788  
Employee benefit plan assets 17   13  
Recurring basis | Significant Unobservable Inputs (Level 3)        
Fair value        
Available-for-sale debt securities 281   296  
Non-recurring basis        
Fair value        
Property and equipment 70   38  
Operating lease right-of-use assets 309   336  
Intangible assets 236   388  
Long-term investments 113   11  
Non-recurring basis | Significant Other Observable Inputs (Level 2)        
Fair value        
Property and equipment 70      
Operating lease right-of-use assets 309      
Intangible assets 236      
Long-term investments ¥ 113      
Non-recurring basis | Significant Unobservable Inputs (Level 3)        
Fair value        
Property and equipment     38  
Operating lease right-of-use assets     336  
Intangible assets     388  
Long-term investments     ¥ 11  
Revenue growth rate | Minimum        
Fair value        
Measurement input 0.01   0.01 0.01
Revenue growth rate | Maximum        
Fair value        
Measurement input 0.04   0.04 0.04
Royalty saving rate | Minimum        
Fair value        
Measurement input 0.015   0.015 0.015
Royalty saving rate | Maximum        
Fair value        
Measurement input 0.03   0.03 0.03
Discount rate | Minimum        
Fair value        
Measurement input 0.0911   0.0911 0.0911
Discount rate | Maximum        
Fair value        
Measurement input 0.12   0.12 0.12