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Business acquisition - Schedule of allocation of the purchase price as of the date of dada acquisition (Details)
¥ in Millions, $ in Millions
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Feb. 28, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Goodwill ¥ 23,123 $ 3,353   ¥ 12,433 ¥ 10,904
Dada Acquisition [Member]          
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Net assets acquired     ¥ 7,549    
Premium not reflected in goodwill     3,623    
Goodwill     4,542    
Deferred tax liabilities     (522)    
Non-controlling interests     (6,522)    
Total     10,760    
Dada Acquisition [Member] | Trademarks and domain names          
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Newly identified and appreciation of intangible assets     805    
Dada Acquisition [Member] | Technology          
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Newly identified and appreciation of intangible assets     525    
Dada Acquisition [Member] | Relationship with riders          
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Newly identified and appreciation of intangible assets     640    
Dada Acquisition [Member] | Consumer base          
Details of allocation of the purchase price as of the date of acquisition as follows [Line Items]          
Newly identified and appreciation of intangible assets     ¥ 120