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PRE-OPENING EXPENSES (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
PRE-OPENING EXPENSES        
Rents ¥ 251   ¥ 460 ¥ 221
Personnel costs 15   14 18
Others 22   28 16
Total ¥ 288 $ 44 ¥ 502 ¥ 255