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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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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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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).

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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 after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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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 amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than 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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of lessee's right to use underlying asset under operating lease.

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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, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2022 USD ($)
Fair value
Total equity securities with readily determinable fair values	¥ 1,788	¥ 2,589		$ 259
Operating lease right-of-use assets	28,970	29,942		4,200
Impairment charge of intangible assets		245
Goodwill, Impairment Loss			¥ 437
Property and equipment, impairment loss		24
Operating lease right-of-use assets, impairment loss		48
Long-term investment, impairment loss		63
Goodwill	5,195	5,132	4,988	$ 753
Long-lived asset impairment loss	297	157	180
Convertible Debt
Fair value
Long-term bank borrowings, current portion		3,029
Carrying amounts of convertible senior notes	3,463	6,186	6,318
Fair value of convertible senior notes	4,283	6,681	¥ 7,747
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value
Total equity securities with readily determinable fair values	1,788	2,589
Employee benefit plan assets	13	5
Recurring basis \| Significant Other Observable Inputs (Level 2)
Fair value
Available-for-sale debt securities		220
Recurring basis \| Significant Unobservable Inputs (Level 3)
Fair value
Available-for-sale debt securities	296
Non-recurring basis
Fair value
Property and equipment		33
Intangible assets		2,556
Operating lease right-of-use assets		88
Non-recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value
Property and equipment	38
Intangible assets	388
Long-term investments	11
Operating lease right-of-use assets	336
Non-recurring basis \| Significant Other Observable Inputs (Level 2)
Fair value
Property and equipment	38
Intangible assets	388
Long-term investments	11
Operating lease right-of-use assets	336
Non-recurring basis \| Significant Unobservable Inputs (Level 3)
Fair value
Property and equipment	218	33
Intangible assets	170	2,556
Long-term investments	27
Operating lease right-of-use assets	¥ 76	¥ 88
Revenue growth rate \| Minimum
Fair value
Measurement input	(15)	(15)	(15)	(15)
Revenue growth rate \| Maximum
Fair value
Measurement input	4	4	4	4
Discount rate \| Minimum
Fair value
Measurement input	8.64	8.64	8.64	8.64
Discount rate \| Maximum
Fair value
Measurement input	12	12	12	12