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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Share-based compensation and Treasury shares (Details) ¥ in Millions	9 Months Ended
	Sep. 30, 2022 CNY (¥) segment $ / ¥	Sep. 30, 2021 CNY (¥)
Share-based compensation
Recognized share-based compensation expenses	¥ 77	¥ 94
Number of operating segments | segment	2
Translation into United States Dollars
Foreign exchange rate used to translate amounts denominated in RMB to US dollar | $ / ¥	7.1135
Hotel operating costs
Share-based compensation
Recognized share-based compensation expenses	¥ 29	32
Selling and marketing expenses
Share-based compensation
Recognized share-based compensation expenses	4	3
General and administrative expenses
Share-based compensation
Recognized share-based compensation expenses	¥ 44	¥ 59

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599

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