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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) - CNY (¥) ¥ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2024
Fair value |  |
Property and equipment | ¥ 52 | ¥ 22
Operating lease right-of-use assets | 228 | 14
Intangible assets | 166 |
Long-term investments | 66 |
Goodwill | 4 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair value |  |
Subtotal | 231 | 219
Employee benefit plan assets | 17 | 17
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair value |  |
Available-for-sale debt securities | 281 | 248
Non-recurring basis |  |
Fair value |  |
Property and equipment | 70 | 13
Operating lease right-of-use assets | 309 | 10
Intangible assets | 236 |
Long-term investments | 113 |
Non-recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair value |  |
Property and equipment | 70 | 13
Operating lease right-of-use assets | 309 | ¥ 10
Intangible assets | 236 |
Long-term investments | ¥ 113 |

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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