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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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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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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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Value of input used to measure servicing asset.

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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