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Business acquisition - Schedule of allocation of the purchase price as of the date of kuayue express acquisition (Detail) - CNY (¥)
¥ in Millions
12 Months Ended
Aug. 31, 2020
Dec. 31, 2020
Summary of purchase price as of the date of acquisition is comprised [Line Items]    
Issuance of ordinary shares of JD Logistics less cash proceeds received   ¥ 116
Kuayue Express [Member]    
Summary of purchase price as of the date of acquisition is comprised [Line Items]    
Cash ¥ 2,850  
Issuance of ordinary shares of JD Logistics less cash proceeds received 116  
Total ¥ 2,966