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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Fair value |  |  |  |
Goodwill | ¥ 0 | $ 0 | ¥ 4 | ¥ 0
Property and equipment, impairment loss | 56 |  | 52 |
Operating lease right-of-use assets, impairment loss | 33 |  | 228 |
Intangible assets, impairment loss | ¥ 391 |  | ¥ 166 |
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net |
Long-term investment, impairment loss | ¥ 30 |  | ¥ 66 |
Assets held for sale, impairment loss | 27 |  | 0 |
Short term investments |  |  |  |
Equity securities with readily determinable fair values | 81 |  | 231 |
Long term investments |  |  |  |
Available-for-sale debt securities | 230 |  | 281 |
Convertible Debt |  |  |  |
Fair value |  |  |  |
Carrying amounts of convertible senior notes | 3,594 |  | 3,537 | 3,463
Fair value of convertible senior notes | 3,815 |  | 3,768 | ¥ 4,283
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Short term investments |  |  |  |
Equity securities with readily determinable fair values | 81 |  | 231 |
Long term investments |  |  |  |
Employee benefit plan assets | 5 |  | 17 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Long term investments |  |  |  |
Available-for-sale debt securities | 230 |  | 281 |
Non-recurring basis |  |  |  |
Fair value |  |  |  |
Property and equipment | 23 |  | 70 |
Operating lease right-of-use assets | 21 |  | 309 |
Intangible assets | 2,102 |  | 236 |
Long-term investments | 11 |  | 113 |
Assets held for sale | 1,795 |  |  |
Non-recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair value |  |  |  |
Property and equipment | 23 |  |  |
Operating lease right-of-use assets | 21 |  |  |
Intangible assets | 2,102 |  |  |
Long-term investments | 11 |  |  |
Assets held for sale | ¥ 1,795 |  |  |
Non-recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair value |  |  |  |
Property and equipment |  |  | 70 |
Operating lease right-of-use assets |  |  | 309 |
Intangible assets |  |  | 236 |
Long-term investments |  |  | ¥ 113 |
Revenue growth rate | Minimum |  |  |  |
Fair value |  |  |  |
Measurement input |  |  |  | 0.01
Revenue growth rate | Maximum |  |  |  |
Fair value |  |  |  |
Measurement input |  |  |  | 0.05
Royalty saving rate | Minimum |  |  |  |
Fair value |  |  |  |
Measurement input |  |  | 0.015 |
Royalty saving rate | Maximum |  |  |  |
Fair value |  |  |  |
Measurement input |  |  | 0.03 |
Discount rate | Minimum |  |  |  |
Fair value |  |  |  |
Measurement input | 0.0864 |  |  |
Discount rate | Maximum |  |  |  |
Fair value |  |  |  |
Measurement input | 0.15 |  |  |

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