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

The amount of impairment of investments.

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Fair value portion of assets classified as held for sale.

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Amount, excluding lessor's underlying asset for which right to use has been conveyed to lessee under operating lease, of impairment for long-lived asset held for use.

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Indicates line item in statement of income or comprehensive income that includes impairment of intangible asset. Includes, but is not limited to, finite-lived and indefinite-lived intangible assets.

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Amount of impairment for lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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