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GOODWILL (Details)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Changes in carrying amount of goodwill        
Balance at the beginning of the period, Gross Amount ¥ 2,661   ¥ 2,634  
Balance at the beginning of the period, Accumulated Impairment Loss (4)   (4)  
Balance at the beginning of the period, Net Amount 2,657   2,630  
Increase in goodwill related to acquisitions 2,697   27  
Impairment losses recognized 437 $ 67 0 ¥ 0
Foreign currency translation adjustment, Gross amount 74      
Foreign currency translation adjustment, Accumulated Impairment Loss (3)      
Next foreign exchange 71      
Balance at the end of the period, Gross Amount 5,432   2,661 2,634
Balance at the end of the period, Accumulated Impairment Loss (444)   (4) (4)
Balance at the end of the period, Net Amount ¥ 4,988 $ 764 ¥ 2,657 ¥ 2,630