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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Segment and geography information -3 (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues ¥ 12,785 $ 2,006 ¥ 10,196 ¥ 11,212
Long-Lived Assets 49,956   48,849  
China        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 11,231   8,647  
Long-Lived Assets 33,143   30,635  
GERMANY        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1,263   1,212  
Long-Lived Assets 13,884   15,670  
Others        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 291   337  
Long-Lived Assets ¥ 2,929   ¥ 2,544