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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets (Details) - CNY (¥) ¥ in Millions		12 Months Ended
	Jan. 02, 2020	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	25 years
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Operating Income (Expense), Net	Other Operating Income (Expense), Net
Impairment loss on intangible assets			¥ 245
Minimum | Manachised and franchised hotels
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		10 years
Minimum | Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		2 years
Minimum | Purchased software
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		3 years
Minimum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		2 years
Maximum | Manachised and franchised hotels
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		20 years
Maximum | Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		10 years
Maximum | Purchased software
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		10 years
Maximum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms		15 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Indicates line item in statement of income or comprehensive income that includes impairment of indefinite-lived intangible asset excluding goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
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