v3.26.1
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details)
¥ in Millions
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Fair value      
Property and equipment, impairment loss ¥ 136 ¥ 56  
Operating lease right-of-use assets, impairment loss 31 33  
Land use rights, impairment loss 13    
Intangible assets, impairment loss ¥ 2 ¥ 391  
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Operating Income (Expense), Net Other Operating Income (Expense), Net  
Long-term investment, impairment loss ¥ 47 ¥ 30  
Assets held for sale, impairment loss 13 27  
Short term investments      
Equity securities with readily determinable fair values 69 81  
Long term investments      
Available-for-sale debt securities 175 230  
Convertible Debt      
Long term investments      
Carrying amounts of convertible senior notes 3,514 3,594 ¥ 3,537
Fair value of convertible senior notes 4,587 3,815 ¥ 3,768
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Short term investments      
Equity securities with readily determinable fair values 69 81  
Long term investments      
Employee benefit plan assets 8 5  
Recurring basis | Significant Unobservable Inputs (Level 3)      
Long term investments      
Available-for-sale debt securities 175 230  
Non-recurring basis      
Fair value      
Property and equipment 13 23  
Operating lease right-of-use assets 47 21  
Intangible assets   2,102  
Long-term investment 175 11  
Assets held for sale 583 1,795  
Non-recurring basis | Significant Unobservable Inputs (Level 3)      
Fair value      
Property and equipment 13 23  
Operating lease right-of-use assets 47 21  
Intangible assets   2,102  
Long-term investment 175 11  
Assets held for sale ¥ 583 ¥ 1,795  
Minimum | Measurement Input, Long-Term Revenue Growth Rate      
Long term investments      
Measurement input     0.01
Minimum | Measurement Input, Royalty Saving Rate      
Long term investments      
Measurement input   0.015  
Minimum | Measurement Input, Discount Rate      
Long term investments      
Measurement input 0.092    
Maximum | Measurement Input, Long-Term Revenue Growth Rate      
Long term investments      
Measurement input     0.02
Maximum | Measurement Input, Royalty Saving Rate      
Long term investments      
Measurement input   0.03  
Maximum | Measurement Input, Discount Rate      
Long term investments      
Measurement input 0.12