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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets (Details) - entity	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
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
VIEs
Finite-Lived Intangible Assets [Line Items]
Number of entities consolidated	6	7

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+ References

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- 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

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483154/926-20-50-5

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