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DEBT - Components (Details)
¥ in Millions, $ in Millions
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
DEBT      
Short-term Debt ¥ 1,142 $ 175 ¥ 8,499
Total 1,142   8,499
Long-term debt, non-current portion 10,856 $ 1,664 8,084
Long-term debt 10,856   8,084
Bank borrowings      
DEBT      
Long-term debt, current portion 251   3,953
Long-term debt, non-current portion 4,384   8,084
Convertible senior notes      
DEBT      
Long-term debt, current portion     3,290
Long-term debt, non-current portion 6,318    
FF&E liability      
DEBT      
Long-term debt, current portion 40    
Long-term debt, non-current portion 135    
Others      
DEBT      
Long-term debt 19    
Bank borrowings      
DEBT      
Short-term Debt ¥ 851   ¥ 1,256