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SEGMENT - Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill (Details)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
SEGMENT        
Revenues ¥ 13,862 $ 2,010 ¥ 12,785 ¥ 10,196
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 48,473   49,956  
China        
SEGMENT        
Revenues 10,637   11,231  
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 31,684   33,143  
Germany        
SEGMENT        
Revenues 2,458   1,263  
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 13,501   13,884  
All others        
SEGMENT        
Revenues 767   291  
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill ¥ 3,288   ¥ 2,929