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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Segment and geography information -2 (Details) ¥ in Millions, $ in Millions	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Segment Reporting Information [Line Items]
Total assets	¥ 63,269	$ 9,927	¥ 65,155
Legacy Huazhu
Segment Reporting Information [Line Items]
Total assets	45,353		46,243
Legacy DH
Segment Reporting Information [Line Items]
Total assets	¥ 17,916		¥ 18,912

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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