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PRE-OPENING EXPENSES (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
PRE-OPENING EXPENSES        
Rents ¥ 68   ¥ 251 ¥ 460
Personnel costs 5   15 14
Others 8   22 28
Total ¥ 81 $ 13 ¥ 288 ¥ 502