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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, $ in Millions
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
SEGMENT          
Revenues ¥ 21,882 $ 3,082 € 750 ¥ 13,862 ¥ 12,785
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 44,705     48,473  
China          
SEGMENT          
Revenues 17,393     10,637 11,231
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 28,762     31,684  
Germany          
SEGMENT          
Revenues 3,324     2,458 1,263
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill 12,504     13,501  
Other than China and Germany          
SEGMENT          
Revenues 1,165     767 ¥ 291
Property and equipment, net, intangible assets, net, right-of-use assets, land use rights, net and goodwill ¥ 3,439     ¥ 3,288