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ACQUISITIONS - Hotels and Companies (Details) - Series of Individually Immaterial Business Acquisitions [Member]
¥ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
item
Dec. 31, 2020
CNY (¥)
item
Dec. 31, 2019
CNY (¥)
item
Acquisitions      
Cash consideration | ¥ ¥ 51 ¥ 26 ¥ 54
Number of hotels acquired | item 3 3 3