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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 |  |

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