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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) - CNY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Fair value |  |
Property and equipment, impairment loss | ¥ 6 | ¥ 56
Operating lease right-of-use assets, impairment loss | ¥ 23 | 33
Intangible assets, impairment loss |  | ¥ 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 |  | ¥ 30
Assets held for sale, impairment loss | ¥ 9 | 27
Short term investments |  |
Equity securities with readily determinable fair values | 67 | 81
Long term investments |  |
Available-for-sale debt securities | 235 | 230
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Short term investments |  |
Equity securities with readily determinable fair values | 67 | 81
Long term investments |  |
Employee benefit plan assets | 5 | 5
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Long term investments |  |
Available-for-sale debt securities | 235 | 230
Non-recurring basis |  |
Fair value |  |
Property and equipment | 12 | 23
Operating lease right-of-use assets | 45 | 21
Intangible assets |  | 2,102
Long-term investment |  | 11
Assets held for sale | 888 | 1,795
Non-recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair value |  |
Property and equipment | 12 | 23
Operating lease right-of-use assets | 45 | 21
Intangible assets |  | 2,102
Long-term investment |  | 11
Assets held for sale | ¥ 888 | ¥ 1,795

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