SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Fair value (Details) - CNY (¥) ¥ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Short term investments
Equity securities with readily determinable fair values	¥ 57	¥ 69
Long term investments
Available-for-sale debt securities	158	175
Property and equipment, impairment loss	32	136
Operating lease right-of-use assets, impairment loss	17	31
Intangible assets, impairment loss	¥ 4	¥ 2
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	¥ 13	¥ 47
Land use rights, impairment loss		13
Assets held for sale, impairment loss		13
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Short term investments
Equity securities with readily determinable fair values	57	69
Long term investments
Employee benefit plan assets	8	8
Recurring basis \| Significant Unobservable Inputs (Level 3)
Long term investments
Available-for-sale debt securities	158	175
Non-recurring basis
Long term investments
Property and equipment	7	13
Operating lease right-of-use assets	23	47
Long-term investment	158	175
Assets held for sale		583
Non-recurring basis \| Significant Unobservable Inputs (Level 3)
Long term investments
Property and equipment	7	13
Operating lease right-of-use assets	23	47
Long-term investment	¥ 158	175
Assets held for sale		¥ 583

The amount of impairment of investments.

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Amount recognized as an operating expense or loss during the period to reduce the carrying amount of land use rights to fair value.

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Fair value of portion of the operating lease right of use assets.

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Fair value of portion of the retirement benefit obligation at reporting date.

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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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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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