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ACQUISITIONS - Deutsche Hospitality (Details) - Deutsche Hospitality. € in Millions, ¥ in Millions |  | 12 Months Ended
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Jan. 02, 2020 EUR (€) item | Jan. 02, 2020 CNY (¥) item | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Business Acquisition [Line Items] |  |  |  |
Percentage of ownership interest acquired | 100.00% | 100.00% |  |
Number of brands in which entity is operating | item | 5 | 5 |  |
Aggregated consideration | € 720 | ¥ 5,624 |  |
Net revenue of the acquiree included in the consolidated statements of comprehensive income |  |  | ¥ 184 | ¥ 1,532
Net loss of the acquiree included in the consolidated statements of comprehensive income |  |  | ¥ 34 | ¥ 1,345

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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